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Derivative Financial Instruments - Outstanding Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | $ 5,944 | $ 2,043
Gains/(Losses) | 269 | 459
Fair Value | 159 | 31
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,171 | 1,797
Gains/(Losses) | (321) | (332)
Fair Value | 9 | 24
Loan sale commitments | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 337 | 354
Gains/(Losses) | 1 | (15)
Fair Value | 11 | 10
IRLCs | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 584 | 755
Gains/(Losses) | (1) | (112)
Fair Value | 21 | 22
IRLCs | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1 | 15
Gains/(Losses) | 0 | 0
Fair Value | 0 | 0
LPCs | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 361 | 145
Gains/(Losses) | 2 | (2)
Fair Value | 3 | 1
LPCs | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 41 | 209
Gains/(Losses) | 1 | 1
Fair Value | 0 | 1
Forward Contracts [Member] | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,365 | 1,143
Gains/(Losses) | 155 | 569
Fair Value | 22 | 8
Forward Contracts [Member] | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,049 | 681
Gains/(Losses) | (126) | (56)
Fair Value | 9 | 9
Treasury futures |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value |  | 14
Treasury futures | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,634 | 0
Gains/(Losses) | 113 | 4
Fair Value | 113 | 0
Treasury futures | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 80 | 892
Gains/(Losses) | (196) | $ (277)
Fair Value | $ 0 |

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