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Share-based compensation (Narrative) (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 14, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 31, 2017 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  | $ 48,000,000 |  |  |  |
Unrecognized compensation expense related to the unvested share-based awards |  |  | $ 345,000,000 |  |  |  |
Weighted-average expected recognition period for the unrecognized compensation expense |  |  | 1 year |  |  |  |
Weighted average remaining contractual term for stock options outstanding |  |  | 6 years 2 months 15 days |  |  |  |
Weighted-average remaining contractual term for stock options exercisable |  |  | 4 years 10 months |  |  |  |
Cash received from exercise of stock options |  |  | $ 133,000,000 |  |  |  |
Restricted stock awards granted to non-management directors |  |  | 22,013 | 23,812 | 24,945.00 |  |
Amounts paid during period by employees for the purchase of shares under the ESPP |  |  | $ 34,000,000 | $ 24,000,000 | $ 18,000,000 |  |
Number of shares purchased during period by employees pursuant to the provisions of the ESPP |  |  | 271,185 | 211,492 | 197,442 |  |
Discounted purchase price from market price for the ESPP |  |  | 85.00% |  |  |  |
Annual estimate of forfeitures for equity awards |  |  | 6.50% | 6.50% | 6.50% |  |
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 |  |  |  |
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] |  |  |  |  |  |  |
Number of unvested restricted stock outstanding |  |  | 4,709,422 | 5,805,126 | 3,489,169 |  | 3,837,097
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of deferred restricted stock units |  |  | 279,986 |  |  |  |
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 under the 2016 LTIP |  |  | 2,452,058 |  |  |  |
Employee Stock Ownership Plan (ESOP), Shares in ESOP |  |  | 6,500,000 |  |  | 2,000,000 |
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 under the 2016 LTIP |  |  | 17,065,705 |  |  |  |
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 | [1] | $ 323,000,000 |  |  |  |  |
[1] | (1) The fair value of the replacement equity awards was $525 million, of which $323 million was attributed to service periods prior to the acquisition and was included in the purchase consideration. Refer to Note 12 for further information on these replacement equity awards.

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