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Unpaid losses and loss expenses (A&E Loss Roll-forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (gross) at beginning of year $ 2,117 $ 2,228 $ 2,303
Balance (net) at beginning of year 1,447 1,527 1,609
Incurred activity, gross 175 237 427
Incurred activity, net [1] 98 (22) 217
Paid activity, gross (304) (348) (502)
Paid activity, net (219) (58) (299)
Balance (gross) at end of year 1,988 2,117 2,228
Balance (net) at end of year 1,326 1,447 1,527
Asbestos Issue [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (gross) at beginning of year 1,492 1,621 1,726
Balance (net) at beginning of year 964 1,051 1,119
Incurred activity, gross 129 136 228
Incurred activity, net 70 75 104
Paid activity, gross (162) (265) (333)
Paid activity, net (118) (162) (172)
Balance (gross) at end of year 1,459 1,492 1,621
Balance (net) at end of year 916 964 1,051
Environmental Issue [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (gross) at beginning of year 625 607 577
Balance (net) at beginning of year 483 476 490
Incurred activity, gross 46 101 199
Incurred activity, net 28 (97) 113
Paid activity, gross (142) (83) (169)
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) (101) 104 (127)
Balance (gross) at end of year 529 625 607
Balance (net) at end of year 410 483 $ 476
Brandywine [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 807    
Balance (net) at end of year 754 807  
Westchester Specialty [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 120    
Balance (net) at end of year 117 120  
Other Segments [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 78    
Balance (net) at end of year 74 78  
The Chubb Corporation [Member]      
Liability For Asbestos And Environmental Claims Net Roll Forward      
Balance (net) at beginning of year 442    
Balance (net) at end of year $ 381 $ 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)