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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.

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