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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 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
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 $ (2) $ 9 $ (1) $ (7)
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Recurring [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 3 0 3 (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 59 (24) 36 5
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Recurring [Member] | 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
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 (4) 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 59 (24) 36 5
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 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 0 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 (5) 13 (4) 0
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 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 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 1 0 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 (4) 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 $ 58 $ (24) $ 26 $ 2