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Policyholders' Liabilities (Future Policy Benefits) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]    
Life insurance $ 195,245 $ 191,654
Individual and group annuities and supplementary contracts 77,254 75,940
Other contract liabilities 30,873 23,052
Subtotal future policy benefits excluding unpaid claims and claim settlement expenses 303,372 290,646
Unpaid claims and claim settlement expenses 2,971 2,881
Total future policy benefits $ 306,343 $ 293,527