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Segment Information (Operations By Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Net premiums written | $ 6,710 | $ 5,995
Net premiums earned | 6,772 | 6,597
Losses and loss expenses | 3,789 | 3,674
Policy benefits | 168 | 126
Policy acquisition costs | 1,397 | 1,413
Administrative expenses | 676 | 772
Underwriting income (loss) | 742 | 612
Net investment income | 745 | 674
Other (income) expense | (70) | 28
Amortization of purchased intangibles | 64 | 7
Segment Income (loss) | 1,493 | 1,251
Net realized gains (losses) including OTTI | (7) | (394)
Interest expense | 154 | 146
Chubb integration expenses | 111 | 148
Income tax expense | 128 | 124
Net income | 1,093 | 439
North America Commercial P&C Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 2,742 | 2,302
Net premiums earned | 3,041 | 2,896
Losses and loss expenses | 1,860 | 1,747
Policy benefits | 0 | 0
Policy acquisition costs | 487 | 482
Administrative expenses | 231 | 266
Underwriting income (loss) | 463 | 401
Net investment income | 478 | 426
Other (income) expense | 4 | 0
Amortization of purchased intangibles | 0 | 0
Segment Income (loss) | 937 | 827
North America Personal P&C Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 984 | 871
Net premiums earned | 1,086 | 1,024
Losses and loss expenses | 633 | 661
Policy benefits | 0 | 0
Policy acquisition costs | 217 | 249
Administrative expenses | 65 | 88
Underwriting income (loss) | 171 | 26
Net investment income | 55 | 47
Other (income) expense | 1 | 1
Amortization of purchased intangibles | 3 | 8
Segment Income (loss) | 222 | 64
North America Agricultural Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 61 | 64
Net premiums earned | 14 | 23
Losses and loss expenses | (73) | (30)
Policy benefits | 0 | 0
Policy acquisition costs | (1) | 4
Administrative expenses | (5) | (4)
Underwriting income (loss) | 93 | 53
Net investment income | 6 | 5
Other (income) expense | 0 | 0
Amortization of purchased intangibles | 7 | 7
Segment Income (loss) | 92 | 51
Overseas General Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 2,200 | 2,041
Net premiums earned | 1,936 | 1,955
Losses and loss expenses | 1,071 | 1,021
Policy benefits | 0 | 0
Policy acquisition costs | 529 | 503
Administrative expenses | 245 | 263
Underwriting income (loss) | 91 | 168
Net investment income | 148 | 146
Other (income) expense | (1) | (5)
Amortization of purchased intangibles | 11 | 11
Segment Income (loss) | 229 | 308
Global Reinsurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 199 | 201
Net premiums earned | 189 | 202
Losses and loss expenses | 94 | 89
Policy benefits | 0 | 0
Policy acquisition costs | 51 | 53
Administrative expenses | 10 | 14
Underwriting income (loss) | 34 | 46
Net investment income | 62 | 67
Other (income) expense | 0 | (1)
Amortization of purchased intangibles | 0 | 0
Segment Income (loss) | 96 | 114
Life Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 524 | 516
Net premiums earned | 506 | 497
Losses and loss expenses | 193 | 177
Policy benefits | 168 | 126
Policy acquisition costs | 114 | 122
Administrative expenses | 72 | 72
Underwriting income (loss) | (41) | 0
Net investment income | 75 | 67
Other (income) expense | (29) | 6
Amortization of purchased intangibles | 1 | 1
Segment Income (loss) | 62 | 60
Corporate And Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net premiums written | 0 | 0
Net premiums earned | 0 | 0
Losses and loss expenses | 11 | 9
Policy benefits | 0 | 0
Policy acquisition costs | 0 | 0
Administrative expenses | 58 | 73
Underwriting income (loss) | (69) | (82)
Net investment income | (79) | (84)
Other (income) expense | (45) | 27
Amortization of purchased intangibles | 42 | (20)
Segment Income (loss) | (145) | (173)
Net realized gains (losses) including OTTI | (7) | (394)
Interest expense | 154 | 146
Chubb integration expenses | 111 | 148
Income tax expense | 128 | 124
Net income | $ (545) | $ (985)

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