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Fair Value Measurements - Changes in Unrealized Gains (Losses) Included in Net Income for Financial Instruments Classified as Level 3 Still Held at Year End (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net realized losses | Net realized losses
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (7) | $ (8)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | (1)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (16) | 74
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Other Comprehensive Income (Loss) [Member] | Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | (6)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (16) | 74
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Securities available-for-sale and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 1
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | (7) | (1)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | CMBS | Securities available-for-sale and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | CMBS | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 10 | 2
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Corporate | Securities available-for-sale and other |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | 0 | (6)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Corporate | Securities available-for-sale and other | Other Comprehensive Income (Loss) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (26) | $ 71

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