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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Loan sale commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | $ 2 | $ 11 |
Interest Rate Lock Commitments, Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 19 | 10 |
us-gaap_InterestRateLockCommitmentsMember |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 0 | 0 |
Loan Purchase Commitments, Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 7 | (1) |
Loan Purchase Commitments, Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 6 | (1) |
Forward Contracts, Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 232 | 15 |
Forward Contracts, Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | (186) | (87) |
Treasury futures, Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) |  | (96) |
Derivative financial instruments, liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | (180) | (184) |
Derivative financial instruments, assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 337 | (26) |
Treasury futures | Recurring Fair Value Measurements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value |  |  | $ (59)
Interest Rate Lock Commitments [Member] | Recurring Fair Value Measurements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value | 41 |  | 22
Forward Contracts [Member] | Recurring Fair Value Measurements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value | 118 |  | 18
Fair Value | (34) |  | (95)
Treasury futures, Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain/(Loss) | 79 | (50) |
Treasury futures, Assets [Member] | Recurring Fair Value Measurements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value | 79 |  |
Loan Purchase Commitments [Member] | Recurring Fair Value Measurements |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value | 12 |  | 6
Fair Value | (1) |  | $ (7)
Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 15,344 | 6,574 |
Fair Value | 250 | 102 |
Assets | Loan sale commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 845 | 652 |
Fair Value | 14 | 22 |
Assets | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 4,272 | 3,432 |
Fair Value | 79 | 62 |
Assets | Interest Rate Lock Commitments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 1,106 | 1,029 |
Fair Value | 41 | 31 |
Assets | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 8,369 | 1,789 |
Fair Value | 118 | 7 |
Assets | Loan Purchase Commitments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 1,597 | 324 |
Fair Value | 12 | 2 |
Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 4,416 | 5,772 |
Fair Value | (35) | (13) |
Liabilities | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional |  | 470 |
Fair Value |  | (3) |
Liabilities | Interest Rate Lock Commitments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 3 | 25 |
Fair Value | 0 | 0 |
Liabilities | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | 4,226 | 4,797 |
Fair Value |  | (8) |
Liabilities | Loan Purchase Commitments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional | $ 187 | 480 |
Fair Value |  | $ (2) |

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