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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