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Segment Information (Operations By Segment) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Net premiums written $ 9,078 $ 8,622 $ 25,410 $ 24,278
Net premiums earned 8,765 8,327 24,687 23,355
Losses and loss expenses 5,835 5,052 16,897 13,865
Policy benefits 198 158 550 515
Policy acquisition costs 1,645 1,603 4,853 4,611
Administrative expenses 733 752 2,201 2,220
Underwriting income (loss) 354 762 186 2,144
Net investment income (loss) 840 873 2,528 2,568
Other (income) expense (485) (57) (372) (326)
Amortization of purchased intangibles 72 76 217 229
Segment Income (loss) 1,607 1,616 2,869 4,809
Net gains (losses) recognized during the period (141) (155) (1,069) (475)
Interest expense 130 138 390 418
Chubb integration expenses 0 2 0 9
Income tax expense 142 230 295 626
Net income 1,194 1,091 1,115 3,281
Segment Reconciling Items        
Segment Reporting Information [Line Items]        
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Losses and loss expenses 1 (14) (2) (8)
Policy benefits 24 (7) 8 20
Policy acquisition costs 0 0 0 0
Administrative expenses 0 0 0 0
Underwriting income (loss) (25) 21 (6) (12)
Net investment income (loss) (32) (21) (64) (62)
Other (income) expense (56) (14) (72) (82)
Amortization of purchased intangibles 0 0 0 0
Segment Income (loss) (1) 14 2 8
Net gains (losses) recognized during the period 1 (14) (2) (8)
Interest expense 0 0 0 0
Chubb integration expenses   0   0
Income tax expense 0 0 0 0
Net income 0 0 0 0
North America Commercial P&C Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 3,778 3,452 10,750 9,937
Net premiums earned 3,456 3,185 10,427 9,660
Losses and loss expenses 2,444 2,051 8,123 6,238
Policy benefits 0 0   0
Policy acquisition costs 489 459 1,452 1,377
Administrative expenses 243 256 751 755
Underwriting income (loss) 280 419 101 1,290
Net investment income (loss) 510 538 1,544 1,584
Other (income) expense 7 5 19 17
Amortization of purchased intangibles 0 0 0 0
Segment Income (loss) 783 952 1,626 2,857
North America Personal P&C Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 1,285 1,251 3,719 3,616
Net premiums earned 1,231 1,187 3,623 3,509
Losses and loss expenses 961 674 2,406 2,178
Policy benefits 0 0 0 0
Policy acquisition costs 248 240 724 708
Administrative expenses 65 72 199 211
Underwriting income (loss) (43) 201 294 412
Net investment income (loss) 64 66 195 194
Other (income) expense 1 1 4 2
Amortization of purchased intangibles 2 3 8 9
Segment Income (loss) 18 263 477 595
North America Agricultural Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 986 938 1,604 1,534
Net premiums earned 971 941 1,441 1,374
Losses and loss expenses 845 880 1,223 1,163
Policy benefits 0 0 0 0
Policy acquisition costs 56 56 96 90
Administrative expenses 5 4 12 9
Underwriting income (loss) 65 1 110 112
Net investment income (loss) 7 8 23 22
Other (income) expense 0 0 1 1
Amortization of purchased intangibles 7 7 20 21
Segment Income (loss) 65 2 112 112
Overseas General Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 2,238 2,228 6,857 6,881
Net premiums earned 2,337 2,256 6,838 6,595
Losses and loss expenses 1,192 1,154 3,935 3,385
Policy benefits 0 0 0 0
Policy acquisition costs 637 630 1,903 1,855
Administrative expenses 260 257 759 771
Underwriting income (loss) 248 215 241 584
Net investment income (loss) 130 147 396 444
Other (income) expense 1 2 10 11
Amortization of purchased intangibles 10 11 33 34
Segment Income (loss) 367 349 594 983
Global Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 181 141 606 540
Net premiums earned 171 160 520 487
Losses and loss expenses 154 79 314 245
Policy benefits 0 0 0 0
Policy acquisition costs 40 42 127 127
Administrative expenses 9 9 28 26
Underwriting income (loss) (32) 30 51 89
Net investment income (loss) 85 71 214 206
Other (income) expense 0 0 1 0
Amortization of purchased intangibles 0 0 0 0
Segment Income (loss) 53 101 264 295
Life Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 610 612 1,874 1,770
Net premiums earned 599 598 1,838 1,730
Losses and loss expenses 183 190 556 581
Policy benefits 174 165 542 495
Policy acquisition costs 175 176 551 454
Administrative expenses 80 80 238 237
Underwriting income (loss) (13) (13) (49) (37)
Net investment income (loss) 95 92 285 278
Other (income) expense (23) (17) (52) (37)
Amortization of purchased intangibles 1 1 3 2
Segment Income (loss) 104 95 285 276
Corporate Segment [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Losses and loss expenses 55 38 342 83
Policy benefits 0 0 0 0
Policy acquisition costs 0 0 0 0
Administrative expenses 71 74 214 211
Underwriting income (loss) (126) (112) (556) (294)
Net investment income (loss) (19) (28) (65) (98)
Other (income) expense (415) (34) (283) (238)
Amortization of purchased intangibles 52 54 153 163
Segment Income (loss) 218 (160) (491) (317)
Net gains (losses) recognized during the period (142) (141) (1,067) (467)
Interest expense 130 138 390 418
Chubb integration expenses   2   9
Income tax expense 142 230 295 626
Net income $ (196) $ (671) $ (2,243) $ (1,837)