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Debt (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 14, 2016 | Dec. 31, 2017 | Apr. 14, 2017 | Mar. 31, 2000
Chubb INA Capital Securities Due 2067 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issued |  | $ 1,000.0 |  |
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt stated interest rate |  | 3.97% | 6.375% |
Debt issued |  | $ 1,000.0 |  |
Junior Subordinated Debt [Member] | Chubb INA Capital Securities Due 2067 [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] |  |  |  |
Long-term debt stated interest rate |  | 5.70% |  |
Debt issued |  | $ 500.0 |  |
Trust Preferred Securities | INA capital securities due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt stated interest rate |  | 9.70% |  | 9.70%
Debt issued |  | $ 309.0 |  | $ 300.0
ACE Capital Trust II common securities purchased |  |  |  | $ 9.2
The Chubb Corporation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | $ 5,300.0 |  |  |

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