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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.