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General Schedule of long-term debt (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Apr. 14, 2017 | Feb. 28, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 1,020 |  |  | $ 500
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 1,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.61% | 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, Face Amount | $ 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 | $ 616 |  |  |
Debt Instrument, Face Amount | $ 600 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |  |
Senior Notes [Member] | Chubb INA Senior Notes Due August 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 104 |  |  |
Debt Instrument, Face Amount | $ 100 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.60% |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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