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Debt (Detail) € in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 EUR (€)
INA Senior Note Due June 2019 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 500 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.90% |  |
Debt, Current |  | $ 499 |  |
Chubb INA Senior Notes Due 2037 [Member] | Junior Subordinated Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.375% |  |
Gain (Loss) on Extinguishment of Debt | $ (36) |  |  |
Senior Notes [Member] | INA Senior Note Due March 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,100 | € 900
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.55% | 1.55%
Make Whole Premium Additional Percent |  |  | 0.15% | 0.15%
Senior Notes [Member] | INA Senior Note Due March 2038 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,100 | € 900
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.50% | 2.50%
Make Whole Premium Additional Percent |  |  | 0.25% | 0.25%
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 300 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.80% | 5.80%
Senior Notes [Member] | INA Senior Note Due May 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 600 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.75% |  |
Senior Notes [Member] | INA Senior Note Due August 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.60% |  |  |

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