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Investments (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) Security | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Security | Sep. 30, 2018 USD ($) | May 31, 2019 | Dec. 31, 2018 USD ($)
Investment [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 100.00% |  | 100.00% |  |  |
Net unrealized appreciation (depreciation) included in OCI | $ (21) | $ (2) | $ (5) | $ (6) |  |
Unrealized appreciation(depreciation) portion of AOCI with OTTI included in AOCI | $ (26) |  | $ (26) |  |  | $ 1
Percentage of mortgage-backed securities represented by investments in US government agency bonds | 83.00% |  | 83.00% |  |  | 81.00%
Company Assumed Recovery Rate |  |  | 32.00% |  |  |
Moodys Historical Mean Recovery Rate |  |  | 42.00% |  |  |
Total number of fixed maturities | Security | 31,075 |  | 31,075 |  |  |
Number of fixed maturities in an unrealized loss position | Security | 4,231 |  | 4,231 |  |  |
Largest single unrealized loss in the fixed maturities | $ 7 |  | $ 7 |  |  |
Restricted assets in fixed maturities and short-term investments | 21,300 |  | 21,300 |  |  | $ 21,000
Restricted assets in cash | 111 |  | 111 |  |  | $ 93
Operating Lease, Impairment Loss |  |  |  | 22 |  |
Corporate and foreign securities [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Credit losses recognized in net income | 18 | 8 | 32 | 9 |  |
Mortgage-backed securities |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Credit losses recognized in net income | $ 0 | 0 | $ 0 | 0 |  |
Junior Subordinated Debt [Member] | Chubb INA Senior Notes Due 2037 [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | (36) |  |
Huatai Insurance Group [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 26.20% |  | 26.20% |  | 6.20% |
Payments to Acquire Other Investments |  |  | $ 329 |  |  |
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000 |  | $ 1,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.375% |  | 6.375% |  |

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