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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Gain (Loss) on Securities [Line Items]        
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) $ 91 $ 3 $ 169 $ 8
Debt Securities, Available-for-sale, Gain (Loss), Total (279) (10) (857) 26
Net realized gains (losses) (384) (21) (787) 833
Foreign exchange 198 106 541 85
Fair Value on Insurance Derivatives 22 (59) (86) 252
Gain (Loss) on Derivative (141) (82) (87) 141
Other [1] (40) (4) (114) (5)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 144 27 545 120
Debt Securities, Available-for-sale, Realized Loss (331) (27) (1,158) (99)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) (70) 1 (133) 17
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell [2] (22) (11) (111) (12)
Equity Securities        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) (80) (42) (287) 475
Other Investments        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) (42) 11 17 111
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (19) (10) (9) (8)
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (198) (9) (232) 9
S&P put options and futures        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative $ 54 $ (4) $ 240 $ (112)
[1] Other realized losses includes $36 million related to impairment of fixed assets. The nine months ended September 30, 2022 also includes impairment of assets related to Chubb’s Russian entities.
[2] Relates to certain securities we intended to sell and securities written to market entering default.