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Business and Basis of Presentation (Universal Life Loss Recognition Reserves/Profit Followed by Losses Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change $ 1,716 $ 1,921 $ 2,623    
Universal Life Loss          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       $ 1,024  
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       6  
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition       1,018  
Universal Life Loss | 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       1,018  
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       0  
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition       1,018  
Universal Life Loss | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       6  
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       6  
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition       0  
Universal Life Loss | 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         $ 1,829
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       680  
Universal Life Loss | As Previously Reported | 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         1,823
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       674  
Universal Life Loss | As Previously Reported | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change         $ 6
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       6  
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (1,149)  
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | 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       (1,149)  
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Other businesses          
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  
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (674)  
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | 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       (674)  
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | Other businesses          
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