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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | $ 8,110 | $ 7,902 | $ 23,229 | $ 22,193
Net premiums earned | 7,908 | 7,807 | 22,599 | 21,816
Net investment income | 823 | 813 | 2,457 | 2,328
Income (Loss) from Subsidiaries, Net of Tax | 0 | 0 | 0 | 0
Net realized gains (losses) including OTTI | 19 | (10) | 35 | 84
Losses and loss expenses | 4,868 | 6,247 | 13,457 | 14,182
Policy benefits | 127 | 169 | 428 | 500
Policy acquisition costs and administrative expenses | 2,223 | 2,202 | 6,590 | 6,430
Interest (income) expense | 164 | 150 | 488 | 451
Other (income) expense | (145) | (118) | (307) | (333)
Amortization of purchased intangibles | 83 | 65 | 253 | 194
Chubb integration expenses | 16 | 50 | 39 | 233
Income tax expense | 183 | (85) | 536 | 243
Net income (loss) | 1,231 | (70) | 3,607 | 2,328
Comprehensive income (loss) | 592 | 629 | 1,322 | 3,711
Consolidating Adjustments and Eliminations |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Net investment income | 0 | 0 | 0 | 0
Income (Loss) from Subsidiaries, Net of Tax | (1,886) | (85) | (5,488) | (3,731)
Net realized gains (losses) including OTTI | 0 | 0 | 0 | 0
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 0 | 0 | 0 | 0
Interest (income) expense | 0 | 0 | 0 | 0
Other (income) expense | 0 | 0 | 0 | 0
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 0 | 0 | 0 | 0
Income tax expense | 0 | 0 | 0 | 0
Net income (loss) | (1,886) | (85) | (5,488) | (3,731)
Comprehensive income (loss) | (687) | (1,472) | (1,407) | (6,477)
Chubb Limited (Parent Guarantor) |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Net investment income | 2 | 1 | 5 | 3
Income (Loss) from Subsidiaries, Net of Tax | 1,177 | (127) | 3,440 | 2,153
Net realized gains (losses) including OTTI | (1) | 0 | (1) | (2)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 23 | 20 | 64 | 56
Interest (income) expense | (75) | (84) | (231) | (252)
Other (income) expense | (9) | (5) | (18) | (7)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 3 | 7 | 7 | 13
Income tax expense | 5 | 6 | 15 | 16
Net income (loss) | 1,231 | (70) | 3,607 | 2,328
Comprehensive income (loss) | 592 | 629 | 1,322 | 3,711
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Net investment income | 3 | 3 | 12 | 10
Income (Loss) from Subsidiaries, Net of Tax | 709 | 212 | 2,048 | 1,578
Net realized gains (losses) including OTTI | 18 | (8) | 67 | (22)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | (90) | 16 | (49) | 28
Interest (income) expense | 203 | 208 | 616 | 641
Other (income) expense | 12 | 9 | 28 | 34
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 1 | 1 | 2 | 54
Income tax expense | (24) | (89) | (119) | (288)
Net income (loss) | 628 | 62 | 1,649 | 1,097
Comprehensive income (loss) | 47 | 748 | (199) | 2,459
Other Chubb Limited Subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 8,110 | 7,902 | 23,229 | 22,193
Net premiums earned | 7,908 | 7,807 | 22,599 | 21,816
Net investment income | 818 | 809 | 2,440 | 2,315
Income (Loss) from Subsidiaries, Net of Tax | 0 | 0 | 0 | 0
Net realized gains (losses) including OTTI | 2 | (2) | (31) | 108
Losses and loss expenses | 4,868 | 6,247 | 13,457 | 14,182
Policy benefits | 127 | 169 | 428 | 500
Policy acquisition costs and administrative expenses | 2,290 | 2,166 | 6,575 | 6,346
Interest (income) expense | 36 | 26 | 103 | 62
Other (income) expense | (148) | (122) | (317) | (360)
Amortization of purchased intangibles | 83 | 65 | 253 | 194
Chubb integration expenses | 12 | 42 | 30 | 166
Income tax expense | 202 | (2) | 640 | 515
Net income (loss) | 1,258 | 23 | 3,839 | 2,634
Comprehensive income (loss) | $ 640 | $ 724 | $ 1,606 | $ 4,018

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