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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Policyholders’ Account Balances – Embedded Derivative        
Liabilities        
Balance, beginning of period $ 6,257 $ 1,196 $ 1,123 $ 872
Acquisitions from business combination       0
Fair value changes in net income 30 533 4 858
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)
Premiums less benefits 54 42 148 71
Transfers into Level 3 0 0 5,066 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 6,341 1,771 6,341 1,771
Funds Withheld for Reinsurance Liabilities - Embedded Derivative        
Liabilities        
Balance, beginning of period 63 79 37 0
Acquisitions from business combination       0
Fair value changes in net income 20 199 46 278
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
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 $ 83 $ 278 $ 83 $ 278
Invested Assets        
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)
Assets        
Balance, beginning of period $ 7,918 $ 9,598 $ 8,981 $ 5,585
Acquisitions from business combination       4,288
Fair value changes in net income (22) 177 83 189
Fair value changes in other comprehensive income 49 (61) 67 121
Purchases 402 1,697 1,783 5,042
Sales (327) (298) (1,909) (4,083)
Settlements or maturities (175)   (322) (2)
Premiums less benefits 0 0 0 0
Transfers into Level 3 112 65 1,042 177
Transfers out of Level 3 (46) (203) (1,814) (342)
Balance, end of period 7,911 10,975 7,911 10,975
Derivative Assets        
Assets        
Balance, beginning of period 188 254 223 227
Acquisitions from business combination       0
Fair value changes in net income 58 41 86 122
Fair value changes in other comprehensive income 0 0 0 0
Purchases 34 37 101 111
Sales 0 (67) 0 (67)
Settlements or maturities (67)   (197) (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 $ 213 $ 265 $ 213 $ 265