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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.

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