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Recent Accounting Pronouncements - Summary of Balance of and Changes in FPB due to Adoption of ASU 2018-12 (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       $ 4,128
Less: Reinsurance recoverable       1,115
As adjusted        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Balance, net of reinsurance     $ 3,013  
As Previously Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       4,005
Cumulative effect of retrospective adoption        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       (78)
Effect of remeasurement of liability at current discount rate        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       201
Immediate Annuities        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       2,175
Less: Reinsurance recoverable $ 116 $ 118 145 322
Immediate Annuities | As adjusted        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Balance, net of reinsurance     1,853  
Immediate Annuities | As Previously Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       1,861
Immediate Annuities | Cumulative effect of retrospective adoption        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       201
Immediate Annuities | Effect of remeasurement of liability at current discount rate        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       113
Traditional Life        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       1,953
Less: Reinsurance recoverable $ 413 $ 612 749 793
Traditional Life | As adjusted        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Balance, net of reinsurance     $ 1,160  
Traditional Life | As Previously Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       2,144
Traditional Life | Cumulative effect of retrospective adoption        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       (279)
Traditional Life | Effect of remeasurement of liability at current discount rate        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Liability for future policy benefit       $ 88