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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
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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.

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