v3.24.1.u1
Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases $ 2,515 $ 1,206
Sales (85) (6)
Issuances and Settlements (889) (365)
Issuances and Settlements 1,541 835
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]    
Purchases (1) (101)
Sales 332 326
Issuances and Settlements (228) (690)
Issuances and Settlements 103 (465)
Policyholder contract deposits    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]    
Purchases 0 0
Sales 332 326
Issuances and Settlements (176) (10)
Issuances and Settlements 156 316
Derivative liabilities, net    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]    
Purchases (1) (101)
Sales 0 0
Issuances and Settlements (103) (167)
Issuances and Settlements (104) (268)
Fortitude Re funds withheld payable    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]    
Purchases 0 0
Sales 0 0
Issuances and Settlements 51 (513)
Issuances and Settlements 51 (513)
Bonds available-for-sale    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 2,423 1,072
Sales (85) (6)
Issuances and Settlements (737) (237)
Issuances and Settlements 1,601 829
Bonds available-for-sale | Obligations of states, municipalities and political subdivisions    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 0
Sales 0 0
Issuances and Settlements (1) (2)
Issuances and Settlements (1) (2)
Bonds available-for-sale | Corporate debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 15 28
Sales 0 0
Issuances and Settlements (6) (14)
Issuances and Settlements 9 14
Bonds available-for-sale | RMBS    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 574 167
Sales 0 0
Issuances and Settlements (170) (175)
Issuances and Settlements 404 (8)
Bonds available-for-sale | CMBS    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 9
Sales (30) (6)
Issuances and Settlements (73) (3)
Issuances and Settlements (103) 0
Bonds available-for-sale | CLO    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 130 10
Sales (2) 0
Issuances and Settlements (107) 11
Issuances and Settlements 21 21
Bonds available-for-sale | ABS    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 1,704 858
Sales (53) 0
Issuances and Settlements (380) (54)
Issuances and Settlements 1,271 804
Other bond securities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 30 40
Sales 0 0
Issuances and Settlements (60) (117)
Issuances and Settlements (30) (77)
Other bond securities | Obligations of states, municipalities and political subdivisions    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 1
Sales 0 0
Issuances and Settlements 0 0
Issuances and Settlements 0 1
Other bond securities | Corporate debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 0
Sales 0 0
Issuances and Settlements 0 (96)
Issuances and Settlements 0 (96)
Other bond securities | RMBS    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 6
Sales 0 0
Issuances and Settlements (3) (3)
Issuances and Settlements (3) 3
Other bond securities | CMBS    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 0
Sales 0 0
Issuances and Settlements 0 0
Issuances and Settlements 0 0
Other bond securities | CLO    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 1 1
Sales 0 0
Issuances and Settlements 0 0
Issuances and Settlements 1 1
Other bond securities | ABS    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 29 32
Sales 0 0
Issuances and Settlements (57) (18)
Issuances and Settlements (28) 14
Equity securities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 0 24
Sales 0 0
Issuances and Settlements 0 0
Issuances and Settlements 0 24
Other invested assets    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]    
Purchases 62 70
Sales 0 0
Issuances and Settlements (92) (11)
Issuances and Settlements $ (30) $ 59