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Fair Value of Financial Instruments - Schedule of Fair Value Assets Measured on Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
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 Net income
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Total other comprehensive income (loss), net of tax Total other comprehensive income (loss), net of tax
Policyholders’ Account Balances – Embedded Derivative    
Liabilities    
Beginning balance $ 872 $ 726
Acquisitions from business combination 0  
Fair value changes in net income 229 147
Fair value changes in other comprehensive income 0 0
Purchases 0 0
Sales 0 0
Settlements or maturities (32) 0
Premiums less benefits 54 (1)
Transfers into Level 3 0  
Transfers out of Level 3 0 0
Ending balance 1,123 872
Funds Withheld for Reinsurance Liabilities - Embedded Derivative    
Liabilities    
Beginning balance 0 0
Acquisitions from business combination 0  
Fair value changes in net income 37 0
Fair value changes in other comprehensive income 0 0
Purchases 0 0
Sales 0 0
Settlements or maturities 0 0
Premiums less benefits 0 0
Transfers into Level 3 0  
Transfers out of Level 3 0 0
Ending balance 37 0
Invested Assets    
Assets    
Beginning balance 5,585 3,167
Acquisitions from business combination 4,288  
Fair value changes in net income 20 97
Fair value changes in other comprehensive income 75 149
Purchases 2,011 7,301
Sales (913) (4,935)
Settlements or maturities (926) 0
Premiums less benefits 0 0
Transfers into Level 3 379  
Transfers out of Level 3 (1,538) (194)
Ending balance 8,981 5,585
Derivative Assets    
Assets    
Beginning balance 227 121
Acquisitions from business combination 0  
Fair value changes in net income 124 19
Fair value changes in other comprehensive income 0 89
Purchases 148 133
Sales (67) 0
Settlements or maturities (209) (135)
Premiums less benefits 0 0
Transfers into Level 3 0  
Transfers out of Level 3 0 0
Ending balance $ 223 $ 227