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Investments (Realized Investment Gains Losses, Net) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net $ 2,079 $ 1,667
Fixed maturities    
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net 1,216 158
Commercial mortgage and other loans    
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net 30 22
Investment real estate    
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net 52 (1)
LPs/LLCs    
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net 0 (3)
Derivatives    
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net 775 1,492
Other    
Gain (Loss) on Securities [Line Items]    
Realized investment gains (losses), net $ 6 $ (1)