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Intangible Assets (Estimated Amortization Expense Over Next Five Years) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
2019, Other intangible assets | $ 298 |
2020, Other intangible assets | 280 |
2021, Other intangible assets | 266 |
2022, Other intangible assets | 246 |
2023, Other intangible assets | 232 |
Total, Other intangible assets | 1,322 |
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2019, Other intangible assets | 80 |
2020, Other intangible assets | 76 |
2021, Other intangible assets | 70 |
2022, Other intangible assets | 64 |
2023, Other intangible assets | 62 |
Total, Other intangible assets | 352 |
The Chubb Corporation [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2019, Other intangible assets | 218 |
2020, Other intangible assets | 204 |
2021, Other intangible assets | 196 |
2022, Other intangible assets | 182 |
2023, Other intangible assets | 170 |
Total, Other intangible assets | 970 |
The Chubb Corporation [Member] | Agency distribution relationships and renewal rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2019, Other intangible assets | 280 |
2020, Other intangible assets | 239 |
2021, Other intangible assets | 216 |
2022, Other intangible assets | 196 |
2023, Other intangible assets | 177 |
Total, Other intangible assets | 1,108 |
The Chubb Corporation [Member] | Fair Value Adjustment to Acquired Loss Reserves [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2019, Other intangible assets | (62) |
2020, Other intangible assets | (35) |
2021, Other intangible assets | (20) |
2022, Other intangible assets | (14) |
2023, Other intangible assets | (7) |
Total, Other intangible assets | (138) |
Balance of FV adjustment on Unpaid Losses and Loss Expenses | $ 207 | $ 309
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 30 years |

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