| Long-Lived Assets | — | $16.7B | $27.1B | $29.4B | $29.5B | $36.6B | $36.5B | $36.6B |
| Trademarks | — | $17.5B | $17.5B | $17.5B | $17.5B | $20.5B | $20.4B | $20.4B |
| Debt issuances | — | $12.5B | $12.4B | $12.5B | $12.9B | $12.9B | $12.9B | $12.9B |
| Fair value of long-term debt | — | $12.3B | $11.7B | $11.9B | $12.4B | $12.6B | $12.5B | $12.3B |
| Fair value of securities sold under agreement to repurchase | — | $10.8B | $9.9B | $10.1B | $11.3B | $10.9B | $13.3B | $11.8B |
| Business Combination, Contingent Consideration, Liability | — | — | — | — | — | $8B | $8.4B | $7.9B |
| Business Combination, Contingent Consideration, Liability, Current | — | — | — | — | — | — | $8.4B | $7.9B |
| Securities Borrowed, Fair Value of Collateral | — | $6.4B | $6.1B | $5.8B | $6.3B | $6.2B | $7.9B | $6.6B |
| Separate Account Collateral Held Under Securities Lending Agreements | — | $6.4B | $6.1B | $5.8B | $6.3B | $6.2B | $7.9B | $6.6B |
| Accounts Receivable, after Allowance for Credit Loss | — | $4.4B | $4.3B | $4.3B | $4.4B | $4.8B | $5.2B | $5.2B |
| Deferred Tax Liabilities, Gross | — | $3.4B | $3.3B | $3.7B | $3.6B | $5B | $4.6B | $4.7B |
| Total Debt Securities | — | $2.5B | $2.3B | $2.5B | $2.7B | $3.2B | $3.3B | $3.8B |
| Investment Commitments | — | $757M | $1.2B | $1.2B | $1.2B | $1.2B | $2.4B | $2.7B |
| Total Equity Method Investments | — | $2.8B | $2.8B | $2.8B | $2.5B | $2.5B | $2.1B | $2.3B |
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | — | $740M | $1.2B | $1.2B | $1.2B | $1.2B | $2.4B | $2.2B |
| Minimum Net Capital Requirement | — | $2B | $1.8B | $1.9B | $2.1B | $2.2B | $2.2B | $2.2B |
| Finite-Lived Intangible Assets, Accumulated Amortization | — | $659M | $782M | $892M | $961M | $1.2B | $1.5B | $1.7B |
| Estimated Annual Fixed Minimum Fees For Currently Outstanding Contracts | — | $290M | $1.2B | $890M | $610M | $310M | $1.3B | $1B |
| CL Os Held At Fair Value | — | — | $72M | — | — | $552M | $568M | $537M |
| Common stock, shares authorized (in shares) | — | 500M | 500M | 500M | 500M | 500M | 500M | 500M |
| Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | — | — | — | — | — | — | $507M | $495M |
| Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value | $457M | $377M | $363M | $338M | $335M | $246M | $367M | $377M |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | — | $753M | $695M | $511M | $601M | $687M | $548M | $348M |
| Aggregate Notional Principal Outstanding | — | $210M | $197M | $218M | $221M | $237M | $231M | $271M |
| Notional | — | $210M | $197M | $218M | $221M | $237M | $231M | $271M |
| Technology Services Subscription Deferred Revenue Liability | $120M | $114M | $124M | $232M | $242M | $232M | $260M | $252M |
| Noncontrolling interests in subsidiaries | — | $172M | $169M | $170M | $165M | $216M | $227M | $217M |
| Common stock, shares issued (in shares) | — | 172.1M | 155.3M | 156M | 156M | 156.3M | 156.3M | 156.3M |
| Common Stock, Shares, Outstanding | — | 148M | 154.9M | 155M | 154.8M | 155.1M | 155.1M | 155.4M |
| Derivative Collateral | — | $70M | $69M | $91M | $87M | $95M | $81M | $137M |
| Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | — | $111M | $111M | $107M | $112M | $109M | $107M | $104M |
| Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value | — | $222M | $320M | $228M | $233M | $214M | $167M | $71M |
| Derivative Pillars | — | $17M | $17M | $17M | $17M | $17M | $17M | $17M |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number | — | 2.1M | 1.7M | 1.6M | 1.4M | 1.3M | 1.3M | 1.1M |
| Treasury stock, shares (in shares) | — | 24.1M | 370.4K | 1M | 1.3M | 1.2M | 1.2M | 911.3K |
| Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number | — | 1.8M | 661.5K | 665.4K | 649.1K | 678.9K | 678K | 662.6K |
| Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable | — | 509.4K | 625.8K | 526K | 434.8K | 327.7K | 300.4K | 157.4K |
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value | — | $778.21 | $806.71 | $841.26 | $842.24 | $847.49 | $847.43 | $937.88 |
| Money Market Valuation Per Share Floor | — | $1.00 | $1.00 | $1.00 | $1.00 | $1.00 | $1.00 | $1.00 |
| Operating Lease Weighted Average Discount Rate Percent | — | 3.0% | 3.0% | 3.0% | 3.0% | 3.0% | 4.0% | 4.0% |
| Common stock, par value (in dollars per share) | — | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| CET1 Capital Adequacy Requirement | — | — | $28M | — | — | — | $33M | — |
| CET1 Well-Capitalized Requirement | — | — | $41M | — | — | — | $48M | — |
| Cumulative Cost Basis | — | — | $2.7B | — | — | — | $2.9B | — |
| ESPP Purchase Price Percentage | — | — | 95.0% | — | — | — | 95.0% | — |
| Capital Required To Be Well Capitalized To Risk Weighted Assets | — | — | 10.0% | — | — | — | 10.0% | — |
| Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | — | — | 4.5% | — | — | — | 4.5% | — |
| Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets | — | — | 6.5% | — | — | — | 6.5% | — |
| Common Equity Tier One Risk Based Capital To Risk Weighted Assets | — | — | 151.9% | — | — | — | 114.0% | — |
| Deferred Tax Assets, Gross | — | — | $1.6B | — | — | — | $2.3B | — |
| Deferred Tax Assets, Net of Valuation Allowance | — | — | $1.5B | — | — | — | $2.2B | — |
| Deferred Tax Assets, Operating Loss Carryforwards | — | — | $103M | — | — | — | $115M | — |
| Deferred tax assets, tax credit carryforwards, foreign | — | — | $39M | — | — | — | $105M | — |
| Compensation and benefits | — | — | $354M | — | — | — | $534M | — |
| Deferred Tax Assets, Valuation Allowance | — | — | $69M | — | — | — | $181M | — |
| Deferred Tax Liabilities, Net | — | — | $3.2B | — | — | — | $4.4B | — |
| Deferred Tax Liabilities, Other | — | — | $341M | — | — | — | $493M | — |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | — | — | $4.4B | $4.5B | — | — | — | — |
| 2028 | — | — | $457M | — | — | — | $1B | — |
| 2030 | — | — | $283M | — | — | — | $852M | — |
| 2031 | — | — | $271M | — | — | — | $809M | — |
| 2027 | — | — | $429M | — | — | — | $1.1B | — |
| 2029 | — | — | $384M | — | — | — | $927M | — |
| Income taxes receivable | — | — | $215M | — | — | — | $247M | — |
| Indefinite- lived intangible impairment | — | — | $21.5B | — | — | — | $29.5B | — |
| Lessee Operating Lease Liability Payments Due | — | — | $2.3B | — | — | — | $2.8B | — |
| Lessee Operating Lease Liability Undiscounted Excess Amount | — | — | $419M | — | — | — | $556M | — |
| Shares reserved for awards to employees and outside directors (in shares) | — | — | $48.5M | — | — | — | $48.5M | — |
| Tier One Leverage Capital Required To Be Well Capitalized To Average Assets | — | — | 5.0% | — | — | — | 5.0% | — |
| Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets | — | — | 8.0% | — | — | — | 8.0% | — |
| Unrecognized tax benefits | — | — | $517M | — | — | — | $511M | — |
| Penalties and interest accrued on unrecognized tax benefits | — | — | $203M | — | — | — | $173M | — |
| Amount that if recognized, would affect the effective tax rate or regulatory liability | — | — | $431M | — | — | — | $435M | — |
| Regulatory Capital Requirement | — | — | $50M | — | — | — | $59M | — |
| Tier 1 Capital Adequacy Requirement | — | — | $38M | — | — | — | $45M | — |
| Tier 1 Leverage Adequacy Requirement | — | — | $53M | — | — | — | $50M | — |
| Tier 1 Leverage Well-Capitalized Requirement | — | — | $67M | — | — | — | $63M | — |
| Tier 1 Well-Capitalized Requirement | — | — | $50M | — | — | — | $59M | — |
| Total Collateral Pledged to Third Parties | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Well-Capitalized Regulatory Requirement | — | — | $63M | — | — | — | $74M | — |
