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Intangible Assets (Estimated Amortization Expense Over Next Five Years) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
2018, Other intangible assets | $ 338 |
2019, Other intangible assets | 294 |
2020, Other intangible assets | 272 |
2021, Other intangible assets | 259 |
2022, Other intangible assets | 241 |
Total, Other intangible assets | 1,404 |
Developed Technology Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2018, Other intangible assets | 83 |
2019, Other intangible assets | 75 |
2020, Other intangible assets | 67 |
2021, Other intangible assets | 61 |
2022, Other intangible assets | 57 |
Total, Other intangible assets | 343 |
The Chubb Corporation [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2018, Other intangible assets | 255 |
2019, Other intangible assets | 219 |
2020, Other intangible assets | 205 |
2021, Other intangible assets | 198 |
2022, Other intangible assets | 184 |
Total, Other intangible assets | 1,061 |
The Chubb Corporation [Member] | Agency distribution relationships and renewal rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2018, Other intangible assets | 325 |
2019, Other intangible assets | 282 |
2020, Other intangible assets | 241 |
2021, Other intangible assets | 218 |
2022, Other intangible assets | 198 |
Total, Other intangible assets | 1,264 |
The Chubb Corporation [Member] | Developed Technology Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2018, Other intangible assets | 32 |
2019, Other intangible assets | 0 |
2020, Other intangible assets | 0 |
2021, Other intangible assets | 0 |
2022, Other intangible assets | 0 |
Total, Other intangible assets | 32 |
The Chubb Corporation [Member] | Fair Value Adjustment to Acquired Loss Reserves [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2018, Other intangible assets | (102) |
2019, Other intangible assets | (63) |
2020, Other intangible assets | (36) |
2021, Other intangible assets | (20) |
2022, Other intangible assets | (14) |
Total, Other intangible assets | (235) |
Increase Decrease on Acquired Unpaid Losses and Loss Expenses | $ 309 |
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |
Minimum | The Chubb Corporation [Member] | Fair Value Adjustment to Acquired Loss Reserves [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 30 years |
Maximum | The Chubb Corporation [Member] | Fair Value Adjustment to Acquired Loss Reserves [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 17 years |

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