| Proceeds from Short-Term Debt | $1.3T | $1.5T | $1.6T | $1.5T | $1.6T | $1.8T | $2.2T | $2.4T |
| Repayments of Short-Term Debt | $1.3T | $1.5T | $1.6T | $1.5T | $1.6T | $1.8T | $2.2T | $2.4T |
| Proceeds from Sale of U.S. Treasury securities | $4.3B | $8.3B | $7.6B | $7.8B | $11.6B | $8B | $11.2B | $30.9B |
| Payments to Acquire U.S. Treasury securities | $3.7B | $9.4B | $2.4B | $9.6B | $8.2B | $10.8B | $23.9B | $29.4B |
| Payments to Acquire Mortgage-Backed Securities (MBS), Available-for-Sale | $9.3B | $12.6B | $13.6B | $6.9B | $15.2B | $11.3B | $12.2B | $15.3B |
| Proceeds from Sale of Mortgage-Backed Securities (MBS), Available-for-Sale | $1.1B | $3.1B | $13.5B | $2.2B | $10.1B | $6.5B | $6B | $8.8B |
| Proceeds from Sale of Debt Securities | $1.3B | $4.9B | $11.8B | $3.2B | $9.4B | $8B | $4.6B | $8.6B |
| Cost of Sale of Investment Securities | $1.4B | $4.8B | $11.9B | $3.4B | $9.6B | $8.1B | $4.6B | $8.5B |
| Proceeds from Sale of Debt Securities, Trading | $1.3B | $4.9B | $11.8B | $3.2B | $9.3B | $8B | $4.3B | $8.5B |
| Cost of Sale of Fair Value Option Securities | $1.4B | $4.8B | $11.9B | $3.4B | $9.5B | $8.1B | $4.3B | $8.4B |
| Principal collections on Agency mortgage-backed securities | $1.3B | $1.5B | $2B | $1.5B | $1.8B | $1.9B | $2.2B | $3.2B |
| Cash Provided by (Used in) Financing Activity, Including Discontinued Operation | $7.1B | $9.5B | — | $5.5B | $3.4B | $5.2B | $11.1B | $2.2B |
| Cash Provided by (Used in) Investing Activity, Including Discontinued Operation | -$7.1B | -$9.6B | — | -$5.7B | -$3.4B | -$5.3B | -$11.4B | -$2B |
| Weighted Average Number of Shares Outstanding | 737.9M | 805M | 781.2M | 916.1M | 1B | 1.1B | 1B | 1.1B |
| Interest Income Operating | $695M | $756M | $856M | $846M | $830M | $903M | $944M | $1.1B |
| Unrealized (gain) loss on investment securities measured at fair value through net income, net | $261M | -$1.7B | $1.9B | -$1.2B | -$270M | -$805M | -$475M | $889M |
| Unrealized gain (loss) on investment securities measured at fair value through net income, net | -$261M | $1.7B | -$1.9B | $1.2B | $270M | $805M | $475M | -$889M |
| Change in Securities Purchased under Agreements to Resell | -$1.1B | $0 | -$3.5B | -$261M | -$3.5B | $214M | $5B | -$868M |
| Payments for (Proceeds from) Derivative Instrument, Investing Activities | -$125M | $975M | -$1.3B | $582M | $192M | — | — | -$660M |
| Net Change in Cash and Restricted Cash | $33M | -$120M | -$15M | -$53M | $154M | $39M | -$169M | $615M |
| Payments of Dividends | $293M | $318M | $348M | $363M | $394M | $416M | $428M | $451M |
| Cash Dividends Paid | $293M | $318M | $348M | $363M | $394M | $416M | $428M | $451M |
| Dividends, Common Stock, Cash | $268M | $295M | $320M | $333M | $372M | $380M | $394M | $407M |
| Proceeds from Issuance of Common Stock | $434M | $780M | $512M | $509M | $799M | $309M | $356M | $401M |
| Issuance of common stock in connection with the Spin-Off and reclassification of net parent investment | $434M | $781M | $511M | $509M | $799M | $309M | $356M | $401M |
| Cash Provided by (Used in) Operating Activity, Including Discontinued Operation | -$20M | $7M | $79M | $192M | $180M | $153M | $128M | $387M |
| (Loss) gain on derivative instruments and other securities, net | $355M | -$1.4B | $2B | -$1B | -$367M | -$36M | — | $382M |
| Loss On Derivative Instruments And Trading Securities Net | -$355M | — | -$2B | $1B | $367M | $36M | — | -$382M |
| Interest Income (Expense), Operating | -$3M | -$64M | $115M | $159M | $162M | $148M | $206M | $319M |
| Comprehensive income available to common shareholders | -$98M | $513M | — | $108M | -$130M | $825M | $974M | -$200M |
| Reclassifications Net of Tax | -$80M | $313M | $86M | $15M | -$178M | $764M | $908M | -$192M |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent | -$66M | $546M | $0 | $143M | -$92M | $867M | $1B | -$156M |
| Other Comprehensive Income (Loss) | -$66M | $546M | $0 | $143M | -$92M | $867M | $1B | -$156M |
| Principal Payments Received on Available-For-Sale securities | $295M | $444M | — | $134M | $139M | $135M | $126M | $108M |
| Sale of investments | $0 | $0 | $0 | $0 | $95M | $0 | $275M | $87M |
| Securities gains, net – non-qualifying hedges on MSRs | -$115M | $106M | -$88M | -$245M | -$177M | -$81M | -$26M | $74M |
| Change in Accounts Payable and Accrued Liabilities | — | — | -$4M | $43M | $25M | $17M | — | $33M |
| Accounts payable and other current liabilities | — | — | -$4M | $43M | $25M | $17M | — | $33M |
| Increase (Decrease) in Other Operating Assets | — | — | -$3M | $17M | $17M | $48M | $69M | -$23M |
| OCI Unrealized Holding Gain (Loss) on Securities, Net of Tax | -$18M | $200M | -$179M | $93M | $48M | $61M | $66M | -$8M |
| Unrealized Gain (Loss) on Securities | -$18M | $200M | -$179M | $93M | $48M | $61M | $66M | -$8M |
| OCI Unrealized Holding Gain (Loss) on Securities, Net of Tax | -$18M | $200M | -$179M | $93M | $48M | $61M | $66M | -$8M |
| Net unrealized gains (losses) on securities still held | -$18M | $200M | -$179M | $93M | $48M | $61M | $66M | -$8M |
| Adjustments To Additional Paid In Capital Sharebased Compensation And Exercise Of Stock Options | $6M | $5M | $8M | -$4M | $8M | $9M | $13M | -$6M |
| Proceeds from sale of credit risk transfer and non-Agency securities | $121M | $95M | $8M | $52M | $218M | — | — | $6M |
| Stock-based compensation | $6M | $5M | $8M | -$4M | $8M | $9M | $13M | -$6M |
| Weighted Average Number of Fully Vested Restricted Stock Units and Performance Share Units Outstanding | 2.1M | 2.2M | 2.2M | 2.2M | 1.7M | 1.8M | 1.9M | 3.8M |
| Principal collections on credit risk transfer and non-Agency securities | $75M | $14M | $20M | $6M | $3M | $16M | $6M | $3M |
| Stock Issued During Period Shares Share Based Compensation Gross | 0 | 0 | 1M | 1.9M | 100K | 0 | 2M | 2.2M |
| Stock Issued During Period, Price Per Share | $9.49 | $10.00 | — | $10.23 | $8.63 | $9.95 | $0.14 | $10.54 |
| Intended annual distribution of taxable net income | — | — | 100.0% | 100.0% | — | — | 100.0% | 100.0% |
| Required Annual Distribution of Taxable Net Income | — | — | 90.0% | 90.0% | — | — | 90.0% | 90.0% |
| Common Stock Dividends Per Share Declared | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Common Stock Dividends Per Share | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Dividends per share declared | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Dividends per share declared | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Common Stock Dividends Per Share Declared | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Dividends declared (in dollars per share) | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Common Stock Dividends Per Share Declared | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Common Stock Dividends Per Share Declared | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 | $0.4 |
| Future Prepayment Rate Assumption Of Investment Portfolio | — | — | 7.7% | 9.6% | — | — | 9.6% | 10.3% |
| Dividends, Common Stock | $284.3M | $284.3M | $284.3M | $369.8M | $369.8M | $369.8M | $369.8M | — |
| Add - Incremental shares under stock-based compensation plans (in shares) | $0 | $2.9M | $300K | $3.6M | $0 | $3.6M | $500K | $0 |
| Ordinary Dividends Per Share | $0.36 | $0.36 | $0.36 | $0.36 | $0.36 | $0.36 | $0.36 | — |
| Ordinary Dividends, Preferred Stock as a Percentage | — | — | — | — | — | — | 10000.0% | — |
| Payments To Acquire Non- Agency Mortgage Backed Securities | $76M | $62M | $29M | $41M | $25M | $2M | $1M | $0 |
