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Debt (Narrative) (Details) € in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Mar. 31, 2000 USD ($)
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate |  |  | 6.375% |  |  |
Debt Instrument, Face Amount |  |  | $ 1,000.0 |  |  |
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate |  |  |  | 5.80% | 5.80% |
Debt Instrument, Face Amount |  |  |  | $ 300.0 |  |
Senior Notes [Member] | INA Senior Notes Due May 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate |  |  | 5.75% |  |  |
Debt Instrument, Face Amount |  |  | $ 600.0 |  |  |
Senior Notes [Member] | INA Senior Note Due August 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate |  | 6.60% |  |  |  |
Debt Instrument, Face Amount |  | $ 100.0 |  |  |  |
Senior Notes [Member] | INA Senior Note Due March 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate |  |  |  | 1.55% | 1.55% |
Make Whole Premium Additional Percent |  |  |  | 0.15% | 0.15% |
Debt Instrument, Face Amount |  |  |  | $ 1,100.0 | € 900 |
Senior Notes [Member] | INA Senior Note Due March 2038 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate |  |  |  | 2.50% | 2.50% |
Make Whole Premium Additional Percent |  |  |  | 0.25% | 0.25% |
Debt Instrument, Face Amount |  |  |  | $ 1,100.0 | € 900 |
Trust Preferred Securities | INA capital securities due 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate | 9.70% |  |  |  |  | 9.70%
ACE Capital Trust II common securities purchased |  |  |  |  |  | $ 9.2
Debt Instrument, Face Amount | $ 309.0 |  |  |  |  | $ 300.0
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ (36.0) |  |  |  |  |
Senior Notes [Member] | INA Senior Notes Due March 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate | 5.80% |  |  |  |  |
Make Whole Premium Additional Percent | 0.35% |  |  |  |  |
Debt Instrument, Face Amount | $ 300.0 |  |  |  |  |
Senior Notes [Member] | INA Senior Notes Due May 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate | 5.75% |  |  |  |  |
Make Whole Premium Additional Percent | 0.30% |  |  |  |  |
Debt Instrument, Face Amount | $ 600.0 |  |  |  |  |
Senior Notes [Member] | INA Senior Note Due August 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt stated interest rate | 6.60% |  |  |  |  |
Make Whole Premium Additional Percent | 0.00% |  |  |  |  |
Debt Instrument, Face Amount | $ 100.0 |  |  |  |  |

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