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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value |  | $ (62)
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | $ 2,322 | 3,467
Fair Value | 36 | 96
Gains/(Losses) | 74 | 431
Assets | Loan sale commitments |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 304 | 439
Fair Value | 6 |
Fair Value |  | (3)
Gains/(Losses) | (4) | (28)
Assets | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 813 | 1,118
Fair Value | 22 | 21
Gains/(Losses) | 0 | (113)
Assets | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 121 | 53
Fair Value | 1 | 1
Gains/(Losses) | 0 | (2)
Assets | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,383 | 2,296
Fair Value | 13 | 74
Gains/(Losses) | 74 | 542
Assets | Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 5 | 0
Fair Value | 0 | 0
Gains/(Losses) | 0 | 4
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 3,930 | 2,038
Fair Value | (95) | (94)
Gains/(Losses) | (293) | (344)
Liabilities | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 40 | 551
Fair Value | 0 | (8)
Gains/(Losses) | 0 | (8)
Liabilities | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 288 | 223
Fair Value | (2) | (5)
Gains/(Losses) | 0 | (2)
Liabilities | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,249 | 458
Fair Value | (28) | (19)
Gains/(Losses) | (97) | (72)
Liabilities | Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,353 | 806
Fair Value | (65) |
Gains/(Losses) | $ (196) | $ (262)

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