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Fair Value of Financial Instruments - Summary of Valuation Techniques and Unobservable Inputs of Level 3 Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Assets        
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]       Net income (loss) for period
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]       Other comprehensive income (loss)
Policyholders’ Account Balances – Embedded Derivative        
Liabilities        
Balance, beginning of period $ 1,196 $ 809 $ 872 $ 726
Acquisitions from business combination 0 0 0 0
Fair value changes in net income 533 23 858 125
Fair value changes in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements or maturities 0 0 (30) 0
Premiums less benefits 42 (7) 71 (26)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 1,771 825 1,771 825
Funds Withheld for Reinsurance Liabilities - Embedded Derivative        
Liabilities        
Balance, beginning of period 79 0 0 0
Acquisitions from business combination 0 0 0 0
Fair value changes in net income 199 0 278 0
Fair value changes in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements or maturities 0 0 0 0
Premiums less benefits 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 278 0 278 0
Invested Assets        
Assets        
Balance, beginning of period 9,598 4,620 5,585 3,167
Acquisitions from business combination 0 0 4,288 0
Fair value changes in net income 177 0 189 97
Fair value changes in other comprehensive income (61) (382) 121 (383)
Purchases 1,697 653 5,042 2,888
Sales (298) (1,058) (4,083) (1,936)
Settlements or maturities 0 (12) (2) (12)
Premiums less benefits 0 0 0 0
Transfers into Level 3 65 0 177 0
Transfers out of Level 3 (203) 0 (342) 0
Balance, end of period 10,975 3,821 10,975 3,821
Derivative Assets        
Assets        
Balance, beginning of period 254 215 227 121
Acquisitions from business combination 0 0 0 0
Fair value changes in net income 41 (32) 122 40
Fair value changes in other comprehensive income 0 0 0 0
Purchases 37 38 111 98
Sales (67) 0 (67) 0
Settlements or maturities 0 (45) (128) (83)
Premiums less benefits 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period $ 265 $ 176 $ 265 $ 176