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Segment Information (Operations By Segment) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net premiums written $ 9,546 $ 8,355 $ 18,208 $ 16,332
Net premiums earned 8,813 8,128 17,034 15,922
Losses and loss expenses 5,006 6,577 10,059 11,062
Policy benefits 185 223 352 352
Policy acquisition costs 1,698 1,593 3,363 3,208
Administrative expenses 775 727 1,519 1,468
Underwriting income (loss) 1,149 (992) 1,741 (168)
Net investment income (loss) 884 827 1,747 1,688
Other (income) expense (777) [1] 58 (1,267) 113
Amortization of purchased intangibles 73 72 145 145
Segment Income (loss) 2,737 (295) 4,610 1,262
Realized Investment Gains (Losses) (33) 30 854 (928)
Interest expense 122 128 244 260
Income tax expense 317 (62) 655 153
Net income (loss) 2,265 (331) 4,565 (79)
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 3 (1) 2 (3)
Policy benefits 15 40 19 (16)
Policy acquisition costs 0 0 0 0
Administrative expenses 0 0 0 0
Underwriting income (loss) (18) (39) (21) 19
Net investment income (loss) (39) (8) (80) (32)
Other (income) expense (54) [1] (48) (99) (16)
Amortization of purchased intangibles 0 0 0 0
Segment Income (loss) (3) 1 (2) 3
Realized Investment Gains (Losses) 3 (1) 2 (3)
Interest expense 0 0 0 0
Income tax expense 0 0 0 0
Net income (loss) 0 0 0 0
North America Commercial P&C Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 4,285 3,720 7,949 6,972
Net premiums earned 3,803 3,595 7,477 6,971
Losses and loss expenses 2,426 3,498 4,986 5,679
Policy benefits 0 0 0 0
Policy acquisition costs 489 471 1,003 963
Administrative expenses 245 249 499 508
Underwriting income (loss) 643 (623) 989 (179)
Net investment income (loss) 535 509 1,075 1,034
Other (income) expense 14 [1] 6 16 12
Amortization of purchased intangibles 0 0 0 0
Segment Income (loss) 1,164 (120) 2,048 843
North America Personal P&C Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 1,363 1,327 2,461 2,434
Net premiums earned 1,224 1,192 2,408 2,392
Losses and loss expenses 676 762 1,495 1,445
Policy benefits 0 0 0 0
Policy acquisition costs 245 231 492 476
Administrative expenses 67 66 127 134
Underwriting income (loss) 236 133 294 337
Net investment income (loss) 64 65 129 131
Other (income) expense (5) [1] 1 (4) 3
Amortization of purchased intangibles 3 3 6 6
Segment Income (loss) 302 194 421 459
North America Agricultural Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 512 461 695 618
Net premiums earned 410 376 520 470
Losses and loss expenses 331 313 416 378
Policy benefits 0 0 0 0
Policy acquisition costs 27 29 39 40
Administrative expenses 3 3 6 7
Underwriting income (loss) 49 31 59 45
Net investment income (loss) 8 7 15 16
Other (income) expense 0 [1] 1 0 1
Amortization of purchased intangibles 6 6 13 13
Segment Income (loss) 51 31 61 47
Overseas General Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 2,497 2,021 5,387 4,619
Net premiums earned 2,579 2,194 5,057 4,501
Losses and loss expenses 1,186 1,485 2,449 2,743
Policy benefits 0 0 0 0
Policy acquisition costs 699 624 1,367 1,266
Administrative expenses 279 241 545 499
Underwriting income (loss) 415 (156) 696 (7)
Net investment income (loss) 149 121 290 266
Other (income) expense 2 [1] 5 3 9
Amortization of purchased intangibles 13 11 25 23
Segment Income (loss) 549 (51) 958 227
Global Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 274 207 481 425
Net premiums earned 192 163 372 349
Losses and loss expenses 110 73 230 160
Policy benefits 0 0 0 0
Policy acquisition costs 47 42 92 87
Administrative expenses 10 9 18 19
Underwriting income (loss) 25 39 32 83
Net investment income (loss) 81 60 151 129
Other (income) expense 0 [1] 1 0 1
Amortization of purchased intangibles 0 0 0 0
Segment Income (loss) 106 98 183 211
Life Insurance [Member]        
Segment Reporting Information [Line Items]        
Net premiums written 615 619 1,235 1,264
Net premiums earned 605 608 1,200 1,239
Losses and loss expenses 185 171 383 373
Policy benefits 170 183 333 368
Policy acquisition costs 191 196 370 376
Administrative expenses 83 82 165 158
Underwriting income (loss) (24) (24) (51) (36)
Net investment income (loss) 101 95 199 190
Other (income) expense (26) [1] (17) (60) (29)
Amortization of purchased intangibles 1 1 2 2
Segment Income (loss) 102 87 206 181
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 89 276 98 287
Policy benefits 0 0 0 0
Policy acquisition costs 0 0 0 0
Administrative expenses 88 77 159 143
Underwriting income (loss) (177) (353) (257) (430)
Net investment income (loss) (15) (22) (32) (46)
Other (income) expense (708) [1] 109 (1,123) 132
Amortization of purchased intangibles 50 51 99 101
Segment Income (loss) 466 (535) 735 (709)
Realized Investment Gains (Losses) (36) 31 852 (925)
Interest expense 122 128 244 260
Income tax expense 317 (62) 655 153
Net income (loss) $ (9) $ (570) $ 688 $ (2,047)
[1] Principally includes our share of operating income and market-to-market gains on private equities where we hold more than three percent. Refer to Note 11 for additional information.