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Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Gain (Loss) on Securities [Line Items]        
Realized Investment Gains (Losses) $ (21) $ (141) $ 833 $ (1,069)
Foreign exchange gains 106 (222) 85 (351)
Insurance Derivatives, Changes in Fair Value, Gain (Loss) (59) 46 252 (426)
Gain (Loss) on Derivative (82) 4 141 (420)
Other (4) (3) (5) (43)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 27 50 120 195
Debt Securities, Available-for-sale, Realized Loss (27) (32) (99) (331)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) 1 42 17 (4)
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [1] (11) (11) (12) (163)
Debt Securities, Available-for-sale, Realized Gain (Loss) (10) 49 26 (303)
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) (42) 0 475 119
Other Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Realized Investment Gains (Losses) 11 31 111 (71)
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (10) 1 (8) (2)
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (9) 9 9 38
S&P put options and futures        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative $ (4) $ (52) $ (112) $ (30)
[1] Relates to certain securities we intended to sell and securities written to market entering default.