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Share-based compensation (Narrative) (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 14, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to the unvested share-based awards |  | $ 458,000,000 |  |
Weighted-average expected recognition period for the unrecognized compensation expense |  | 1 year |  |
Weighted average remaining contractual term for stock options outstanding |  | 6 years |  |
Weighted-average remaining contractual term for stock options exercisable |  | 4 years 9 months 12 days |  |
Cash received from exercise of stock options |  | $ 78,000,000 |  |
Restricted stock awards granted to non-management directors |  | 20,784 | 22,013 | 23,812
Amounts paid during period by employees for the purchase of shares under the ESPP |  | $ 37,000,000 | $ 34,000,000 | $ 24,000,000
Number of shares purchased during period by employees pursuant to the provisions of the ESPP |  | 347,116 | 271,185 | 211,492
Discounted purchase price from market price for the ESPP |  | 85.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate for the ESPP |  | 10.00% |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee Stock Purchase Plan Authorized Amount |  | $ 25,000 |  |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 3 years |  |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 3 years |  |
Stock option term in years |  | 10 years |  |
Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 4 years |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 1 year |  |
Number of deferred restricted stock units |  | 251,843 |  |
Restricted Stock Units (RSUs) | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 1 year |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 3 years |  |
ACE Limited 2004 Long-Term Incentive Plan [Member] | Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of award |  | 4 years |  |
Common shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares remaining as available for issuance |  | 2,104,942 |  |
Employee Stock Ownership Plan (ESOP), Shares in ESOP |  | 6,500,000 |  |
Common shares | Chubb Limited 2016 Long-Term Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares authorized for issuance under plan |  | 19,500,000 |  |
Common shares remaining as available for issuance |  | 14,100,867 |  |
The Chubb Corporation [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Value of Equity Awards Issued in Acquisition | $ 525,000,000 |  |  |
Attributed Value Equity Awards Assumed in Acquisition | $ 323,000,000 |  |  |

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