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Unpaid losses and loss expenses (A&E Loss Roll-forward) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (gross) at December 31, 2017 $ 2,228
Balance (net) at December 31, 2017 1,527
Incurred activity, gross 237
Incurred activity, net (22) [1]
Paid activity, gross (348)
Paid activity, net (58)
Balance (gross) at December 31, 2018 2,117
Balance (net) at December 31, 2018 1,447
Asbestos Issue [Member]  
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (gross) at December 31, 2017 1,621
Balance (net) at December 31, 2017 1,051
Incurred activity, gross 136
Incurred activity, net 75
Paid activity, gross (265)
Paid activity, net (162)
Balance (gross) at December 31, 2018 1,492
Balance (net) at December 31, 2018 964
Environmental Issue [Member]  
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (gross) at December 31, 2017 607
Balance (net) at December 31, 2017 476
Incurred activity, gross 101
Incurred activity, net (97)
Paid activity, gross (83)
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) 104
Balance (gross) at December 31, 2018 625
Balance (net) at December 31, 2018 483
Brandywine [Member]  
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (net) at December 31, 2017 849
Balance (net) at December 31, 2018 807
Westchester Specialty [Member]  
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (net) at December 31, 2017 113
Balance (net) at December 31, 2018 120
Other Segments [Member]  
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (net) at December 31, 2017 79
Balance (net) at December 31, 2018 78
The Chubb Corporation [Member]  
Liability For Asbestos And Environmental Claims Net Roll Forward  
Balance (net) at December 31, 2017 486
Balance (net) at December 31, 2018 $ 442
[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)