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Fair Value of Financial Instruments - Schedule of Fair Value Assets Measured on Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net income (loss) for period Net income (loss) for period Net income (loss) for period 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) Other comprehensive income (loss) Other comprehensive income (loss) Other comprehensive income (loss)
Policyholders’ Account Balances – Embedded Derivative        
Liabilities        
Balance, beginning of period $ 948 $ 904 $ 1,123 $ 873
Acquisitions from business combination   0   0
Fair value changes in net income 242 287 (26) 324
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 (30) 0 (30)
Premiums less benefits 1 35 94 29
Transfers into Level 3 5,066 0 5,066 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 6,257 1,196 6,257 1,196
Funds Withheld for Reinsurance Liabilities - Embedded Derivative        
Liabilities        
Balance, beginning of period 55 0 37 0
Acquisitions from business combination   0   0
Fair value changes in net income 8 79 26 79
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 63 79 63 79
Invested Assets        
Assets        
Balance, beginning of period 9,743 5,199 8,981 5,585
Acquisitions from business combination   4,288   4,288
Fair value changes in net income 50 12 105 12
Fair value changes in other comprehensive income (10) 875 18 182
Purchases 1,218 1,302 1,381 3,346
Sales (1,537) (2,048) (1,582) (3,785)
Settlements or maturities (134) (2) (147) (2)
Premiums less benefits 0 0 0 0
Transfers into Level 3 235 112 930 112
Transfers out of Level 3 (1,647) (139) (1,768) (139)
Balance, end of period 7,918 9,599 7,918 9,599
Derivative Assets        
Assets        
Balance, beginning of period 149 257 223 227
Acquisitions from business combination   0   0
Fair value changes in net income 66 24 28 81
Fair value changes in other comprehensive income 0 0 0 0
Purchases 34 39 67 74
Sales 0 0 0 0
Settlements or maturities (61) (66) (130) (128)
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 $ 188 $ 254 $ 188 $ 254