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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 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
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in Unrealized Gain/(Loss) Included in Net Income, Assets | $ (2) | $ (8) | $ 1 | $ (16)
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Equity Securities [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) | 0 | (1)
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | (17) | 3 | (22) | 30
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Other Comprehensive Income (Loss) [Member] | Equity Securities [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 | 0 | 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | (2) | 0 | (2)
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | (17) | 3 | (22) | 30
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | (2) | (5) | 1 | (13)
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | 0 | 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | 0 | 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | 1 | 6 | 10 | 2
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | (2) | 0 | (2)
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | 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 | $ (18) | $ (3) | $ (32) | $ 28

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