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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Gain (Loss) on Securities [Line Items]        
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) $ 61 $ 1 $ 78 $ 5
Debt Securities, Available-for-sale, Gain (Loss), Total (442) 12 (578) 36
Net realized gains (losses) (includes $(442), $12, $(578), and $36 reclassified from AOCI) (504) (33) (403) 854
Foreign exchange 268 (97) 343 (21)
Fair Value on Insurance Derivatives (143) (8) (108) 311
Gain (Loss) on Derivative (71) (160) 54 223
Other 0 [1] 0 (74) (1)
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-sale, Realized Gain 362 56 401 93
Debt Securities, Available-for-sale, Realized Loss (700) (53) (827) (72)
Debt Securities, Allowance for Credit Loss, Period Increase (Decrease) (51) 10 (63) 16
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell (53) [2] (1) (89) (1)
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Realized Gain (Loss) (263) 150 (207) 517
Other Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) (includes $(442), $12, $(578), and $36 reclassified from AOCI) 4 62 59 100
Other derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative 9 3 10 2
Investment and embedded derivative instruments        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative (81) (91) (34) 18
S&P put options and futures        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Derivative $ 144 $ (64) $ 186 $ (108)
[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.