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Unpaid losses and loss expenses (A&E Loss Roll-forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (gross) at beginning of year $ 1,988 $ 2,117 $ 2,228
Balance (net) at beginning of year 1,326 1,447 1,527
Incurred activity, gross 229 175 237
Incurred activity, net [1] 131 98 (22)
Paid activity, gross (349) (304) (348)
Paid activity, net (205) (219) (58)
Balance (gross) at end of year 1,868 1,988 2,117
Balance (net) at end of year 1,252 1,326 1,447
Asbestos Issue [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (gross) at beginning of year 1,459 1,492 1,621
Balance (net) at beginning of year 916 964 1,051
Incurred activity, gross 150 129 136
Incurred activity, net 90 70 75
Paid activity, gross (258) (162) (265)
Paid activity, net (133) (118) (162)
Balance (gross) at end of year 1,351 1,459 1,492
Balance (net) at end of year 873 916 964
Environmental Issue [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (gross) at beginning of year 529 625 607
Balance (net) at beginning of year 410 483 476
Incurred activity, gross 79 46 101
Incurred activity, net 41 28 (97)
Paid activity, gross (91) (142) (83)
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) (72) (101) 104
Balance (gross) at end of year 517 529 625
Balance (net) at end of year 379 410 $ 483
Brandywine [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 754    
Balance (net) at end of year 736 754  
Westchester Specialty [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 117    
Balance (net) at end of year 103 117  
Other Segments [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 74    
Balance (net) at end of year 80 74  
The Chubb Corporation [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 381    
Balance (net) at end of year $ 333 $ 381  
[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)