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Business and Basis of Presentation (Unearned Revenue Reserves) (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    
Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Total balance after reinsurance recoverable $ 131 $ 138 $ 226    
Policyholder Contract Deposit          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       $ 3,176  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable       3,176  
Policyholder Contract Deposit | Total Corporate and Other          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       190  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable       190  
Policyholder Contract Deposit | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       30  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable       30  
As Previously Reported | Policyholder Contract Deposit          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         $ 2,592
As Previously Reported | Policyholder Contract Deposit | Total Corporate and Other          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         152
As Previously Reported | Policyholder Contract Deposit | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         30
Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       584  
Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | Total Corporate and Other          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       38  
Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | Other businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       0  
Variable/ Universal Life | Policyholder Contract Deposit | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       2,743  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable       2,743  
Variable/ Universal Life | As Previously Reported | Policyholder Contract Deposit | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         2,204
Variable/ Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | Individual Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       539  
Life Planner | Policyholder Contract Deposit | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       163  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable       163  
Life Planner | As Previously Reported | Policyholder Contract Deposit | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         161
Life Planner | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       2  
Gibraltar Life and Other | Policyholder Contract Deposit | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring       50  
Less: Reinsurance recoverable       0  
Total balance after reinsurance recoverable       50  
Gibraltar Life and Other | As Previously Reported | Policyholder Contract Deposit | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Additional insurance reserves, including amounts in AOCI, EOP, post-flooring         $ 45
Gibraltar Life and Other | Effect Of Application Of Accounting Standards Update 2018-12, Changes In Benefit Reserves | Policyholder Contract Deposit | International Businesses          
Liability for Future Policy Benefit, Activity [Line Items]          
Effect of actual variances from expected experience and other activity       $ 5