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Business and Basis of Presentation (Cost of Reinsurance) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring $ 14,439 $ 12,822 $ 11,934    
Variable/ Universal Life | Other liabilities | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       $ 3,259  
Less: Reinsurance recoverable       580  
Total balance after reinsurance recoverable       3,839  
Variable/ Universal Life | As Previously Reported | Other liabilities | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         $ 3,058
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Other liabilities | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       (659)  
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Balance Prior To Transition, Excluding Amounts Related To Unrealized Investment Gains And Losses | Other liabilities | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       2,399  
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Impact From Updates To Certain Universal Life Contract Liabilities | Other liabilities | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       $ 860