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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | $ 7,978 | $ 32,681
Derivative Asset, Fair Value, Gross Asset | 153 | 526
Gains/(Losses) | 9 | 37
Assets | Loan sale commitments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 543 | 2,341
Derivative Asset, Fair Value, Gross Asset | 1 | 42
Gains/(Losses) | (24) | (60)
Assets | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 3,122 | 8,950
Derivative Asset, Fair Value, Gross Asset | 72 | 232
Gains/(Losses) | (62) | (182)
Assets | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 203 | 1,165
Derivative Asset, Fair Value, Gross Asset | 2 | 8
Gains/(Losses) | (1) | (30)
Assets | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Notional Amount | 4,653 | 22,566
Derivative Asset, Fair Value, Gross Asset | 79 | 286
Gains/(Losses) | 72 | 249
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 3,001 | 10,615
Derivative financial instruments | 68 | 116
Gains/(Losses) | 52 | (41)
Liabilities | IRLCs |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 551 | 240
Derivative financial instruments | 5 | 1
Gains/(Losses) | 5 | 1
Liabilities | LPCs |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 658 | 3,974
Derivative financial instruments | 8 | 38
Gains/(Losses) | 6 | 37
Liabilities | Forward MBS trades |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 695 | 6,341
Derivative financial instruments | 6 | 76
Gains/(Losses) | (2) | (80)
Liabilities | Swap futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | 1,097 | 60
Derivative financial instruments | 49 | 1
Gains/(Losses) | $ 43 | $ 1

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