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General Schedule of long-term debt (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Apr. 14, 2017 | Feb. 28, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 922 |  |  | $ 500
Chubb INA Capital Securities Due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 1,000 |  |  |
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.55% | 6.375% |  |
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2037 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |  |  |
Senior Notes [Member] | INA Senior Notes Due February 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt |  |  | $ 500 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.70% |
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 300 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.80% |  |  |
Senior Notes [Member] | Chubb INA Senior Notes Due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 600 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |

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