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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Assets        
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]       Net income
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)
PAB – Embedded Derivative        
Liabilities        
Balance, beginning of period $ 904 $ 784 $ 873 $ 726
Acquisitions from business combination 0 0 0 0
Fair value changes in net income 287 0 287 0
Net change included in interest sensitive contract benefits 0 51 (38) 102
Fair value changes in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements or maturities (30) 0 (30) 0
Premiums less benefits 35 (26) 104 (19)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 1,196 809 1,196 809
Funds Withheld for Reinsurance Liabilities - Embedded Derivative        
Liabilities        
Balance, beginning of period 0 0 0 0
Acquisitions from business combination 0 0 0 0
Fair value changes in net income 79 0 79 0
Net change included in interest sensitive contract benefits 0 0 0 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 79 0 79 0
Invested Assets        
Assets        
Balance, beginning of period 5,199 4,419 5,585 3,167
Acquisitions from business combination 4,288 0 4,288 0
Fair value changes in net income 12 11 12 97
Net change included in interest sensitive contract benefits 0 0 0 0
Fair value changes in other comprehensive income 875 (1) 182 (1)
Purchases 1,302 822 3,346 2,235
Sales (2,048) (631) (3,785) (878)
Settlements or maturities (2) 0 (2) 0
Premiums less benefits 0 0 0 0
Transfers into Level 3 112 0 112 0
Transfers out of Level 3 (139) 0 (139) 0
Balance, end of period 9,599 4,620 9,599 4,620
Derivative Assets        
Assets        
Balance, beginning of period 257 167 227 121
Acquisitions from business combination 0 0 0 0
Fair value changes in net income 24 47 81 72
Net change included in interest sensitive contract benefits 0 0 0 0
Fair value changes in other comprehensive income 0 0 0 0
Purchases 39 30 74 60
Sales 0 0 0 0
Settlements or maturities (66) (29) (128) (38)
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 $ 254 $ 215 $ 254 $ 215