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Investments (Accrued Investment Income) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Net Investment Income [Line Items]    
Accrued investment income [1] $ 3,063 $ 3,193
Fixed maturities    
Net Investment Income [Line Items]    
Accrued investment income 2,558 2,676
Equity securities    
Net Investment Income [Line Items]    
Accrued investment income 8 7
Commercial mortgage and other loans    
Net Investment Income [Line Items]    
Accrued investment income 196 205
Policy loans    
Net Investment Income [Line Items]    
Accrued investment income 277 274
Other invested assets    
Net Investment Income [Line Items]    
Accrued investment income 21 27
Short-term investments and cash equivalents    
Net Investment Income [Line Items]    
Accrued investment income $ 3 $ 4
[1] See Note 4 for details of balances associated with variable interest entities.