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Derivative Financial Instruments - Outstanding Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | $ 4,073 | $ 5,944
Fair Value | 46 | 159
Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 11,678 | 1,171
Fair Value | 161 | 9
Loan sale commitments |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 1 | 1
Loan sale commitments | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 900 | 337
Fair Value | 12 | 11
IRLCs | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 691 | 584
Fair Value | 22 | 21
IRLCs | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 39 | 1
Fair Value | 0 | 0
LPCs | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 511 | 361
Fair Value | 6 | 3
LPCs | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 1,013 | 41
Fair Value | 7 | 0
Forward Contracts [Member] | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 2,871 | 2,365
Fair Value | 18 | 22
Forward Contracts [Member] | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 6,816 | 1,049
Fair Value | 95 | 9
Treasury futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | (379) | (196)
Fair Value |  | 0
Treasury futures [Member] | Assets |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 0 | 2,634
Fair Value | 0 | 113
Treasury futures [Member] | Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Outstanding Notional | 3,810 | 80
Fair Value | 59 |
Derivative financial instruments, total, Assets |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 334 | 269
Derivative financial instruments, Total, liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | (810) | (321)
Interest Rate Lock Commitments, Assets |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 1 | (1)
Loan Purchase Commitments, Assets |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 3 | 2
Treasury futures, Assets |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 98 | 113
Forward Contracts, Assets |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 232 | 155
Forward Contracts, Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | (424) | (126)
Interest Rate Lock Commitments, Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | 0 | 0
Loan Purchase Commitments, Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gains/(Losses) | $ (7) | $ 1

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