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Unpaid losses and loss expenses (A&E Loss Roll-forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Catastrophe Claims [Line Items]        
Unpaid losses and loss expenses $ 63,179 $ 60,540 $ 37,303 $ 38,315
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (gross) at December 31, 2016 2,303      
Balance (net) at December 31, 2016 1,609      
Incurred activity, gross 427      
Incurred activity, net 217 [1] 164    
Paid activity, gross (502)      
Paid activity, net (299)      
Balance (gross) at December 31, 2017 2,228 2,303    
Balance (net) at December 31, 2017 1,527 1,609    
Brandywine [Member]        
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (net) at December 31, 2016 760      
Balance (net) at December 31, 2017 849 760    
Westchester Specialty [Member]        
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (net) at December 31, 2016 112      
Balance (net) at December 31, 2017 113 112    
Chubb Corp [Member]        
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (net) at December 31, 2016 657      
Balance (net) at December 31, 2017 486 657    
Other Segments [Member]        
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (net) at December 31, 2016 80      
Balance (net) at December 31, 2017 79 80    
Environmental        
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (gross) at December 31, 2016 577      
Balance (net) at December 31, 2016 490      
Incurred activity, gross 199      
Incurred activity, net 113      
Paid activity, gross (169)      
Paid activity, net (127)      
Balance (gross) at December 31, 2017 607 577    
Balance (net) at December 31, 2017 476 490    
Asbestos        
Liability For Asbestos And Environmental Claims Net Roll Forward        
Balance (gross) at December 31, 2016 1,726      
Balance (net) at December 31, 2016 1,119      
Incurred activity, gross 228      
Incurred activity, net 104      
Paid activity, gross (333)      
Paid activity, net (172)      
Balance (gross) at December 31, 2017 1,621 1,726    
Balance (net) at December 31, 2017 1,051 $ 1,119    
Brandywine Run-off [Member]        
Liability for Catastrophe Claims [Line Items]        
Unpaid losses and loss expenses $ 2,000      
[1] (1) Excludes unallocated loss expenses and the net activity reflects third-party reinsurance other than the aggregate excess of loss reinsurance provided by National Indemnity Company (NICO) to Westchester Specialty (see Westchester Specialty section below).