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Closed Block (Closed Block Liabilities and Assets Designated to Closed Block; Maximum Future Earnings to be Recognized) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Closed Block liabilities          
Future policy benefits $ 43,587   $ 44,414    
Policyholders’ dividends payable 648   617    
Policyholders’ dividend obligation 792 $ 0 0 $ 8,027  
Policyholders’ account balances 4,500   4,607   $ 4,737
Other Closed Block liabilities 3,605   3,499    
Total Closed Block liabilities 53,132   53,137    
Closed Block assets          
Fixed maturities, available-for-sale, at fair value 30,314   29,898    
Fixed maturities, trading, at fair value 887   900    
Equity securities, at fair value 1,970   1,733    
Commercial mortgage and other loans 7,769   7,926    
Policy loans 3,479   3,637    
Other invested assets 4,513   4,254    
Short-term investments 232   337    
Total investments 49,164   48,685    
Cash and cash equivalents 993   1,307    
Accrued investment income 421   402    
Other Closed Block assets 138   162    
Total Closed Block assets 50,716   50,556    
Excess of reported Closed Block liabilities over Closed Block assets 2,416   2,581    
Portion of above representing accumulated other comprehensive income (loss):          
Net unrealized investment gains (losses) (2,241)   (3,458)    
Allocated to policyholder dividend obligation 2,081   3,207    
Future earnings to be recognized from Closed Block assets and Closed Block liabilities $ 2,256   $ 2,330