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Business and Basis of Presentation (Additional Insurance Reserves) (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    
Less: Reinsurance recoverable 69 76 5    
Total balance after reinsurance recoverable, EOP $ 1,563 $ 1,758 $ 2,500    
Additional insurance reserves          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       $ 11,289  
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       10,103  
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition       1,186  
Less: Reinsurance recoverable       4,387  
Total balance after reinsurance recoverable, EOP       6,902  
Additional insurance reserves | 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       360  
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       360  
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition       0  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       360  
Additional insurance reserves | 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         $ 10,787
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       9,172  
Additional insurance reserves | 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         483
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       377  
Additional insurance reserves | 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       (1,615)  
Additional insurance reserves | 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       (106)  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Future Policy Benefits AIR To MRB          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (916)  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Future Policy Benefits AIR To MRB | 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       (92)  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Policyholders’ Account Balances AIR To MRB          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (48)  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Policyholders’ Account Balances AIR To MRB | 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       (48)  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Updates To Certain Universal Life Contract Liabilities And Other Activity          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       1,779  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Updates To Certain Universal Life Contract Liabilities And Other Activity | 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       7  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Change In Discount Rate For Annuitization Benefits          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       116  
Additional insurance reserves | Effect Of Application Of Accounting Standards Update 2018-12, Change In Discount Rate For Annuitization Benefits | 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       116  
Additional insurance reserves | Individual Variable | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       0  
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       0  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable, EOP       0  
Additional insurance reserves | Individual Variable | As Previously Reported | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change         889
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       824  
Additional insurance reserves | Individual Variable | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (65)  
Additional insurance reserves | Individual Variable | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Future Policy Benefits AIR To MRB | Retirement Strategies          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (824)  
Additional insurance reserves | Individual Variable | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Policyholders’ Account Balances AIR To MRB | Retirement Strategies          
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  
Additional insurance reserves | Individual Variable | Effect Of Application Of Accounting Standards Update 2018-12, Updates To Certain Universal Life Contract Liabilities And Other Activity | Retirement Strategies          
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  
Additional insurance reserves | Individual Variable | Effect Of Application Of Accounting Standards Update 2018-12, Change In Discount Rate For Annuitization Benefits | Retirement Strategies          
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  
Additional insurance reserves | Variable/ Universal 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       10,929  
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       9,743  
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition       1,186  
Less: Reinsurance recoverable       4,387  
Total balance after reinsurance recoverable, EOP       6,542  
Additional insurance reserves | Variable/ Universal Life | 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         $ 9,415
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses       7,971  
Additional insurance reserves | Variable/ Universal Life | 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       (1,444)  
Additional insurance reserves | Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Future Policy Benefits AIR To MRB | 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  
Additional insurance reserves | Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Reclassification Of Policyholders’ Account Balances AIR To MRB | 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  
Additional insurance reserves | Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Updates To Certain Universal Life Contract Liabilities And Other Activity | 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       1,772  
Additional insurance reserves | Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Change In Discount Rate For Annuitization Benefits | 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