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Business and Basis of Presentation (Terminal Dividend Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Term Life | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change $ 19,852 $ 19,288 $ 22,768   $ 23,400
Less: Reinsurance recoverable 744 708 532    
Total balance after reinsurance recoverable, EOP $ 7,834 $ 7,298 $ 9,266    
Terminal Dividend Liability          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       $ 580  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       580  
Terminal Dividend Liability | Closed Block division          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       375  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       375  
Terminal Dividend Liability | As Previously Reported          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change         591
Terminal Dividend Liability | As Previously Reported | Closed Block division          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change         375
Terminal Dividend Liability | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (11)  
Terminal Dividend Liability | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Closed Block division          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       0  
Terminal Dividend Liability | Variable/ Universal Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       201  
Terminal Dividend Liability | Variable/ Universal Life | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       201  
Terminal Dividend Liability | Variable/ Universal Life | As Previously Reported          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change         212
Terminal Dividend Liability | Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (11)  
Terminal Dividend Liability | Term Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       4  
Terminal Dividend Liability | Term Life | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       4  
Terminal Dividend Liability | Term Life | As Previously Reported          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change         $ 4
Terminal Dividend Liability | Term Life | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       $ 0