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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
Mar. 31, 2022
Mar. 31, 2021
Gain (Loss) on Securities [Line Items]    
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) $ 17 $ 4
Debt Securities, Available-for-sale, Gain (Loss), Total (136) 24
Net realized gains (losses) (includes $(136) and $24 reclassified from AOCI) 101 887
Foreign exchange 75 76
Fair Value on Insurance Derivatives 35 319
Gain (Loss) on Derivative 125 383
Other (74) [1] (1)
Fixed Maturities [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Available-for-sale, Realized Gain 39 37
Debt Securities, Available-for-sale, Realized Loss (127) (19)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) (12) 6
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell (36) [2] 0
Equity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Equity Securities, FV-NI, Realized Gain (Loss) 56 367
Other Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) (includes $(136) and $24 reclassified from AOCI) 55 38
Other derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative 1 (1)
Investment and embedded derivative instruments    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative 47 109
S&P put options and futures    
Gain (Loss) on Securities [Line Items]    
Gain (Loss) on Derivative $ 42 $ (44)
[1] Other realized losses include 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.