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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | $ 32,681 | $ 8,649
Fair Value | 526 | 294
Gains/(Losses) | 37 | 141
Assets | Loan sale commitments |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,341 | 2,598
Fair Value | 42 | 111
Gains/(Losses) | (60) | 79
Assets | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 8,950 | 6,923
Fair Value | 232 | 263
Gains/(Losses) | (182) | 128
Assets | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,165 | 834
Fair Value | 8 | 25
Gains/(Losses) | (30) | 13
Assets | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 22,566 | 886
Fair Value | 286 | 6
Gains/(Losses) | 249 | 0
Assets | Eurodollar futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional |  | 6
Fair Value |  | 0
Gains/(Losses) |  | 0
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 10,615 | 10,267
Derivative financial instruments | 116 | 223
Gains/(Losses) | (41) | 208
Liabilities | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 240 | 22
Derivative financial instruments | 1 | 0
Gains/(Losses) | 1 | 0
Liabilities | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 3,974 | 10
Derivative financial instruments | 38 | 0
Gains/(Losses) | 37 | (3)
Liabilities | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 6,341 | 10,229
Derivative financial instruments | 76 | 223
Gains/(Losses) | (80) | 211
Liabilities | Swap futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 60 |
Derivative financial instruments | 1 |
Gains/(Losses) | $ 1 |
Liabilities | Eurodollar futures |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional |  | 6
Derivative financial instruments |  | 0
Gains/(Losses) |  | $ 0

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