| Issuance of debt | $26.4B | $25.9B | $28.0B | $32.4B | $36.9B | $24.8B | $45.0B | $56.2B |
| Increase (Decrease) in Financial Instruments Used in Operating Activities | -$11.8B | -$2.0B | -$22.1B | $49.0B | $17.0B | $3.8B | $0.0 | $53.6B |
| Cash Provided by (Used in) Financing Activity, Including Discontinued Operation | $0.0 | $23.0B | $15.3B | $13.0B | $21.7B | $9.1B | $24.0B | $36.5B |
| Accounts payable | -$4.6B | $13.4B | -$38.1B | $24.5B | $11.9B | $13.3B | $1.1B | $31.7B |
| Repayments of Debt | $21.0B | $15.9B | $25.6B | $20.8B | $24.2B | $26.1B | $28.2B | $27.6B |
| Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation | — | — | — | -$14.6B | — | — | — | $21.8B |
| Interest and Dividend Income, Operating | $13.5B | $14.2B | $13.5B | $13.7B | $14.9B | $15.5B | $15.0B | $15.3B |
| Interest Paid, Net | $11.1B | $11.5B | $11.9B | $12.5B | $12.1B | $10.1B | $12.4B | $14.2B |
| Interest Paid, Excluding Capitalized Interest, Operating Activity | $11.1B | $11.5B | $11.9B | $12.5B | $12.1B | $10.1B | $12.4B | $14.2B |
| Noninterest Expense | $10.9B | $11.1B | $11.2B | $12.1B | $12.0B | $12.2B | $12.1B | $13.5B |
| Increase (Decrease) in Deposits | — | — | — | $5.5B | — | — | — | $12.8B |
| Payments to Acquire Debt Securities, Available-for-Sale | $9.3B | $9.3B | $7.6B | $6.6B | $12.1B | $10.1B | $7.8B | $11.7B |
| Payments for (Proceeds from) Loans Receivable | $9.4B | $4.2B | $8.7B | $6.5B | $11.7B | $10.4B | $12.8B | $8.4B |
| Cash Provided by (Used in) Operating Activity, Including Discontinued Operation | $2.5B | -$17.3B | $11.8B | -$24.0B | — | -$3.3B | -$2.4B | -$7.1B |
| Cash Provided by (Used in) Investing Activity, Including Discontinued Operation | -$13.7B | -$6.7B | -$10.2B | -$5.0B | -$17.7B | -$10.7B | -$13.4B | -$6.6B |
| Comprehensive Income Including Noncontrolling Interest | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income Attributable to Parent | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income Including Noncontrolling Interest | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive income (loss), including noncontrolling interest | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income (Loss), Total | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income, Including Noncontrolling Interest | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income Including Noncontrolling Interest | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Total Comprehensive Income | $3.4B | $4.1B | $2.8B | $5.3B | $3.7B | $4.2B | $4.4B | $6.4B |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $3.4B | $4.0B | $2.9B | $5.2B | $3.6B | $4.2B | $4.5B | $6.3B |
| Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale | $4.2B | $6.1B | $5.5B | $5.3B | $3.8B | $7.0B | $5.7B | $6.0B |
| Sale of investments | $987.0M | $5.0M | $188.0M | $1.7B | $748.0M | $2.2B | $381.0M | $5.9B |
| Reclassifications Net of Tax | $2.9B | $3.0B | $3.6B | $4.2B | $3.4B | $4.5B | $4.3B | $5.4B |
| Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities | $2.4B | $2.8B | $2.2B | $1.7B | $2.8B | $1.6B | $2.3B | $3.7B |
| Interest and Fee Income, Loans and Leases | $3.5B | $3.6B | $3.4B | $3.3B | $3.5B | $3.6B | $3.6B | $3.6B |
| Payments Related to Common Stock Repurchase and Tax Withholding for Share-based Compensation | $823.0M | $806.0M | $852.0M | $2.0B | $1.1B | $1.1B | $1.5B | $2.9B |
| Interest Income (Expense), Operating | $2.1B | $2.2B | $2.6B | $2.4B | $2.3B | $2.5B | $2.9B | $2.7B |
| Interest Expense, Deposits | $2.6B | $2.8B | $2.6B | $2.5B | $2.6B | $2.8B | $2.7B | $2.6B |
| Interest Income, Other | $2.1B | $2.1B | $2.0B | $2.5B | $2.0B | $2.7B | $2.6B | $2.5B |
| Unrealized Gain Loss On Debt Valuation Adjustment Pretax Accumulated Other Comprehensive Income Loss | -$2.5B | -$2.8B | -$2.9B | -$2.4B | -$2.7B | -$3.8B | -$4.0B | -$2.4B |
| Purchase price | $750.0M | $750.0M | $750.0M | $1.0B | $1.0B | $1.1B | $1.5B | $1.8B |
| Payments of Dividends | $1.5B | $1.6B | $1.6B | $1.6B | $1.6B | $1.7B | $1.7B | $1.7B |
| Dividends, Common Stock | $1.4B | $1.5B | $1.5B | $1.5B | $1.5B | $1.6B | $1.6B | $1.6B |
| Interest Income Operating | $1.3B | $1.3B | $1.4B | $1.3B | $1.3B | $1.4B | $1.3B | $1.3B |
| Payments to Acquire Held-to-Maturity Securities | $1.5B | $583.0M | $337.0M | $0.0 | $0.0 | $0.0 | $0.0 | $999.0M |
| Effect of exchange rate changes on cash, cash equivalents and restricted cash | — | — | — | $1.3B | — | — | — | -$928.0M |
| Other comprehensive income (loss) | $251.0M | $869.0M | -$902.0M | $903.0M | $90.0M | -$474.0M | $0.0 | $782.0M |
| AOCI before reclass, net of taxes | $238.0M | $856.0M | -$908.0M | $906.0M | $66.0M | -$511.0M | $0.0 | $772.0M |
| Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax | $238.0M | $856.0M | -$908.0M | $906.0M | $66.0M | -$511.0M | $0.0 | $772.0M |
| Payments for (Proceeds from) Productive Assets | $851.0M | $916.0M | $879.0M | $713.0M | $763.0M | $713.0M | $709.0M | $754.0M |
| Cash and cash equivalents | $733.0M | $680.0M | $752.0M | $659.0M | $627.0M | $608.0M | $672.0M | $699.0M |
| Stock-based compensation | $417.0M | $372.0M | $391.0M | $539.0M | $469.0M | $449.0M | $469.0M | $571.0M |
| Proceeds from (Repayments of) Other Secured Financings | $135.0M | $24.0M | $3.0B | -$683.0M | $4.1B | — | $276.0M | -$506.0M |
| Income Taxes Paid, Net | $810.0M | $406.0M | $436.0M | $534.0M | $1.8B | $339.0M | $820.0M | $398.0M |
| Income Taxes Paid, Net | $810.0M | $406.0M | $436.0M | $534.0M | $1.8B | $339.0M | $820.0M | $398.0M |
| Payment for (Proceeds from) Other Investing Activity | $199.0M | $518.0M | $497.0M | $24.0M | $426.0M | $296.0M | $346.0M | $313.0M |
| OCI - Cash flow hedge, net of tax | $0.0 | $34.0M | -$57.0M | $17.0M | $16.0M | $42.0M | — | -$298.0M |
| Other comprehensive income (loss), net of tax | $0.0 | $34.0M | -$57.0M | $17.0M | $16.0M | $42.0M | — | -$298.0M |
| OCI Cash Flow Hedge Gain (Loss) | $0.0 | $34.0M | -$57.0M | $17.0M | $16.0M | $42.0M | — | -$298.0M |
| Unrealized Gains (Losses) on Hedge Instruments | $0.0 | $34.0M | -$57.0M | $17.0M | $16.0M | $42.0M | — | -$298.0M |
| Unrealized gains (losses) on hedge instruments | $0.0 | $34.0M | -$57.0M | $17.0M | $16.0M | $42.0M | — | -$298.0M |
| Financing — other | -$150.0M | -$74.0M | -$80.0M | $260.0M | — | — | $94.0M | $164.0M |
| Dividends on preferred shares | $134.0M | $160.0M | $150.0M | $158.0M | $147.0M | $160.0M | $147.0M | $156.0M |
| Private equity losses | $157.0M | $315.0M | $215.0M | $369.0M | $388.0M | $374.0M | $220.0M | $146.0M |
| OCI - Available-for-sale securities, net of tax | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| OCI Net Unrealized Gain (Loss) on Securities | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| OCI Available for Sale Securities Adjustment | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| Unrealized Gains on Available-for-Sale Securities | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| Unrealized gains (losses) on available-for-sale securities | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| Other Comprehensive Income (Loss) | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| OCI Available for Sale Securities Adjustment, Net of Tax | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| OCI Unrealized Gain (Loss) on Securities, Pre-tax | $109.0M | $723.0M | — | $358.0M | $42.0M | $349.0M | $239.0M | -$135.0M |
| Provision for credit losses | $76.0M | $79.0M | $115.0M | $135.0M | $196.0M | $0.0 | $18.0M | $98.0M |
| Provision for credit losses | $85.0M | $18.0M | $65.0M | $81.0M | $138.0M | $6.0M | $5.0M | $82.0M |
| Other Noncash Income (Expense) | -$87.0M | -$46.0M | — | $2.0M | -$158.0M | -$112.0M | -$140.0M | -$74.0M |
| Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $41.0M | $38.0M | $10.0M | $56.0M | $36.0M | $45.0M | $27.0M | $71.0M |
| Gross charge-offs | — | $101.0M | $87.0M | $31.0M | $31.0M | $64.0M | $88.0M | $37.0M |
| Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months | -$10.0M | $51.0M | $36.0M | -$21.0M | -$46.0M | — | -$8.0M | -$34.0M |
| Foreign currency translation gains (losses) | -$142.0M | $284.0M | -$391.0M | $188.0M | $204.0M | -$21.0M | — | -$18.0M |
| Foreign Currency Translation Adjustment, Net of Tax | -$142.0M | $284.0M | -$391.0M | $188.0M | $204.0M | -$21.0M | — | -$18.0M |
| Provision for (recapture of) credit losses | — | — | — | $54.0M | — | — | — | $16.0M |
| Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization Expense | $19.0M | $15.0M | $12.0M | $13.0M | $15.0M | $15.0M | $10.0M | $14.0M |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | -$17.0M | -$20.0M | -$7.0M | $2.0M | -$33.0M | -$48.0M | -$35.0M | -$13.0M |
| Reclassification from AOCI | -$13.0M | -$13.0M | -$6.0M | $3.0M | -$24.0M | -$37.0M | -$25.0M | -$10.0M |
| Reclassified net gains (losses) from AOCI into earnings | -$13.0M | -$13.0M | -$6.0M | $3.0M | -$24.0M | -$37.0M | -$25.0M | -$10.0M |
| OCI Reclassifications to Net Income | -$13.0M | -$13.0M | -$6.0M | $3.0M | -$24.0M | -$37.0M | -$25.0M | -$10.0M |
| Stock options excluded as their inclusion would be anti-dilutive (in shares) | 0 | 0 | 0 | 4M | 4M | 0 | 2M | 9M |
| Other | -$1.0M | $3.0M | — | $8.0M | $14.0M | — | — | -$7.0M |
| Total net securities (losses) | $7.0M | $0.0 | $2.0M | $21.0M | $0.0 | $3.0M | $6.0M | $5.0M |
| OCI - Defined benefit plan, net of tax | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| Other Comprehensive Income (Loss) | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| OCI Defined Benefit Plan Net of Tax | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| OCI Defined Benefit Plan, After Tax | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| OCI Pension Adjustments | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| OCI Pension Reclassification Adjustment, Pre-tax | -$9.0M | -$3.0M | — | -$2.0M | -$2.0M | -$4.0M | -$17.0M | -$4.0M |
| OCI Attributable to Noncontrolling Interest | -$46.0M | $95.0M | -$74.0M | $50.0M | $42.0M | -$41.0M | -$61.0M | $3.0M |
| Debt Securities, Available-for-Sale, Realized Loss | $0.0 | $0.0 | $0.0 | $0.0 | $1.0M | $0.0 | $0.0 | $3.0M |
| Other | -$1.0M | $9.0M | $12.0M | $9.0M | $19.0M | -$1.0M | -$55.0M | -$3.0M |
| Tax effect | -$4.0M | -$7.0M | -$1.0M | -$1.0M | -$9.0M | -$11.0M | -$10.0M | -$3.0M |
| Other income | — | — | — | $0.0 | — | — | — | $1.0M |
| Number of reportable segments | — | — | — | 0.75 | 0.75 | 0.75 | 0.75 | 3.00 |
| Common Stock Dividends Per Share Declared | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| Common Stock Dividends Per Share | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| Dividends per share declared | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| Dividends per share declared | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| Common Stock Dividends Per Share Declared | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| Common Stock Dividends Per Share Declared | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| Common Stock Dividends Per Share Declared | $0.9 | $0.9 | $0.9 | $0.9 | $0.9 | $1.0 | $1.0 | $1.0 |
| AFS securities: Annualized average yield including the interest rate swap accrual of related hedges, due within 1 year (as a percent) | — | — | — | 2.8% | — | — | — | 3.8% |
| Goodwill Translation and Purchase Accounting Adjustments | -$5.8M | -$5.8M | -$5.8M | $5.0M | $5.0M | $5.0M | $5.0M | — |
| Pre-tax stock-based compensation cost | $405.5M | $405.5M | $405.5M | $481.5M | $481.5M | $481.5M | $481.5M | — |
| Amortization of capitalized software and acquired intangible assets | $150.5M | $150.5M | $150.5M | $113.5M | $113.5M | $113.5M | $113.5M | — |
| Federal | $502.8M | $502.8M | $502.8M | $558.0M | $558.0M | $558.0M | $558.0M | — |
| Foreign | $311.0M | $311.0M | $311.0M | $383.8M | $383.8M | $383.8M | $383.8M | — |
| Federal | $2.0M | $2.0M | $2.0M | $98.5M | $98.5M | $98.5M | $98.5M | — |
| Deferred taxes | $38.0M | $38.0M | $38.0M | $140.3M | $140.3M | $140.3M | $140.3M | — |
| State | -$1.5M | -$1.5M | -$1.5M | $22.8M | $22.8M | $22.8M | $22.8M | — |
| Effective tax rates | $0.1 | $0.1 | $0.2 | $0.1 | $0.1 | $0.1 | $0.2 | — |
| Income taxes at U.S. statutory rate of 21% | $0.1 | $0.1 | $0.2 | $0.1 | $0.1 | $0.1 | $0.2 | — |
| Effect of cross-border tax laws | $7.5M | $7.5M | $7.5M | $3.0M | $3.0M | $3.0M | $3.0M | — |
| Effect of cross-border tax laws | — | — | 0.2% | — | — | — | 0.1% | — |
| Other | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | — |
| Nontaxable or nondeductible items | — | — | -2.1% | — | — | — | -1.9% | — |
| State income taxes – net of federal income tax benefit | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | — |
| Changes in unrecognized tax benefits | — | — | 0.4% | — | — | — | 0.5% | — |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent | — | — | 1.7% | — | — | — | 1.2% | — |
| Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent | — | — | 0.3% | — | — | — | 0.1% | — |
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) | — | $98.0M | $87.0M | $23.0M | $19.0M | $63.0M | $87.0M | — |
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | — | $3.0M | — | $8.0M | $12.0M | $1.0M | $1.0M | — |
| Acquired intangibles | $3.3M | $3.3M | $3.3M | $250.0K | $250.0K | $250.0K | $250.0K | — |
| Goodwill Additions | $5.8M | $5.8M | $5.8M | — | — | — | — | — |
| Goodwill impairment losses | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | $0.0 | — |
| Translation and other | -$5.8M | -$5.8M | -$5.8M | $5.0M | $5.0M | $5.0M | $5.0M | — |
| Goodwill, Written off Related to Sale of Business Unit | $250.0K | $250.0K | $250.0K | — | — | — | — | — |
| Federal taxes | $113.0M | $113.0M | $113.0M | $375.3M | $375.3M | $375.3M | $375.3M | — |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | $9.0M | $9.0M | $9.0M | $7.5M | $7.5M | $7.5M | $7.5M | — |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $47.3M | $47.3M | $47.3M | $46.8M | $46.8M | $46.8M | $46.8M | — |
| Changes in unrecognized tax benefits | $19.3M | $19.3M | $19.3M | $24.8M | $24.8M | $24.8M | $24.8M | — |
| Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | $73.8M | $73.8M | $73.8M | $65.0M | $65.0M | $65.0M | $65.0M | — |
| Distributed under benefit plans | — | — | 23M | — | — | — | 18M | — |
| Number of shares purchased (in shares) | — | — | 43M | — | — | — | 42M | — |
| Unrecognized tax benefits, settlements | $43.5M | $43.5M | $43.5M | $500.0K | $500.0K | $500.0K | $500.0K | — |
| Additions for tax positions of prior years | $33.0M | $33.0M | $33.0M | $19.5M | $19.5M | $19.5M | $19.5M | — |
