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Segment information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Net premiums written $ 10,710 $ 9,189
Net premiums earned 10,142 8,737
Losses and loss expenses 5,148 4,564
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 797 373
Policy acquisition costs 1,948 1,719
Administrative expenses 930 778
Underwriting income (loss) 1,319 1,303
Net investment income (loss) 1,107 822
Other (income) expense (296) (312)
Amortization of purchased intangibles 72 71
Segment Income (loss) 2,650 2,366
Net realized gains (losses) (77) 23
Market risk benefits gains (losses) (115) 49
Interest Income (Expense), Net 160 132
Cigna integration expenses 22 0
Income tax expense 384 353
Net income 1,892 1,953
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Net premiums written 0 0
Net premiums earned 0 0
Losses and loss expenses (1) 1
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) (25) (31)
Policy acquisition costs 0 0
Administrative expenses 0 0
Underwriting income (loss) 26 30
Net investment income (loss) (91) (63)
Other (income) expense (66) (32)
Amortization of purchased intangibles 0 0
Segment Income (loss) 1 (1)
Net realized gains (losses) (1) 1
Market risk benefits gains (losses) 0 0
Interest Income (Expense), Net 0 0
Cigna integration expenses 0  
Income tax expense 0 0
Net income 0 0
North America Commercial P&C Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written   4,039
Net premiums earned   4,114
Losses and loss expenses   2,497
Policy benefits (includes remeasurement gains (losses) of $1 and $(5))   0
Policy acquisition costs   573
Administrative expenses   265
Underwriting income (loss)   779
Net investment income (loss)   489
Other (income) expense   6
Amortization of purchased intangibles   0
Segment Income (loss)   1,262
North America Personal P&C Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written   1,180
Net premiums earned   1,247
Losses and loss expenses   713
Policy benefits (includes remeasurement gains (losses) of $1 and $(5))   0
Policy acquisition costs   260
Administrative expenses   69
Underwriting income (loss)   205
Net investment income (loss)   59
Other (income) expense   1
Amortization of purchased intangibles   2
Segment Income (loss)   261
North America Agricultural Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written 293 62
Net premiums earned 159 (29)
Losses and loss expenses 140 (92)
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 0 0
Policy acquisition costs 15 12
Administrative expenses 3 (1)
Underwriting income (loss) 1 52
Net investment income (loss) 17 7
Other (income) expense 1 0
Amortization of purchased intangibles 6 7
Segment Income (loss) 11 52
Overseas General Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written 3,263 3,079
Net premiums earned 2,786 2,628
Losses and loss expenses 1,237 1,296
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 110 93
Policy acquisition costs 713 679
Administrative expenses 280 269
Underwriting income (loss) 446 291
Net investment income (loss) 188 147
Other (income) expense (9) 2
Amortization of purchased intangibles 18 14
Segment Income (loss) 625 422
Global Reinsurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written 277 253
Net premiums earned 244 235
Losses and loss expenses 112 115
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 0 0
Policy acquisition costs 62 62
Administrative expenses 9 9
Underwriting income (loss) 61 49
Net investment income (loss) 49 85
Other (income) expense (1) 0
Amortization of purchased intangibles 0 0
Segment Income (loss) 111 134
Life Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written 1,293 576
Net premiums earned 1,264 542
Losses and loss expenses 32 24
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 712 311
Policy acquisition costs 273 133
Administrative expenses 167 84
Underwriting income (loss) 80 (10)
Net investment income (loss) 153 103
Other (income) expense (15) (30)
Amortization of purchased intangibles 4 2
Segment Income (loss) 244 121
Segment Corporate and Other    
Segment Reporting Information [Line Items]    
Net premiums written 0 0
Net premiums earned 0 0
Losses and loss expenses 11 10
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 0 0
Policy acquisition costs 0 0
Administrative expenses 97 83
Underwriting income (loss) (108) (93)
Net investment income (loss) 11 (5)
Other (income) expense (214) (259)
Amortization of purchased intangibles 42 46
Segment Income (loss) 75 115
Net realized gains (losses) (76) 22
Market risk benefits gains (losses) (115) 49
Interest Income (Expense), Net 160 132
Cigna integration expenses 22  
Income tax expense 384 353
Net income (682) $ (299)
North America Commercial P&C Insurance [Member]    
Segment Reporting Information [Line Items]    
Net premiums written 4,288  
Net premiums earned 4,369  
Losses and loss expenses 2,729  
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 0  
Policy acquisition costs 613  
Administrative expenses 295  
Underwriting income (loss) 732  
Net investment income (loss) 698  
Other (income) expense 7  
Amortization of purchased intangibles 0  
Segment Income (loss) 1,423  
Segment Insurance North American Personal P&C    
Segment Reporting Information [Line Items]    
Net premiums written 1,296  
Net premiums earned 1,320  
Losses and loss expenses 888  
Policy benefits (includes remeasurement gains (losses) of $1 and $(5)) 0  
Policy acquisition costs 272  
Administrative expenses 79  
Underwriting income (loss) 81  
Net investment income (loss) 82  
Other (income) expense 1  
Amortization of purchased intangibles 2  
Segment Income (loss) $ 160