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Investments (Accrued Investment Income) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Net Investment Income [Line Items]    
Accrued investment income [1] $ 3,287 $ 3,012
Fixed maturities    
Net Investment Income [Line Items]    
Accrued investment income 2,727 2,517
Equity securities    
Net Investment Income [Line Items]    
Accrued investment income 6 6
Commercial mortgage and other loans    
Net Investment Income [Line Items]    
Accrued investment income 224 190
Policy loans    
Net Investment Income [Line Items]    
Accrued investment income 259 253
Other invested assets    
Net Investment Income [Line Items]    
Accrued investment income 23 18
Short-term investments and cash equivalents    
Net Investment Income [Line Items]    
Accrued investment income $ 48 $ 28
[1] See Note 4 for details of balances associated with variable interest entities.