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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | $ 8,622 | $ 8,110 | $ 24,278 | $ 23,229
Net premiums earned | 8,327 | 7,908 | 23,355 | 22,599
Net investment income | 873 | 823 | 2,568 | 2,457
Equity In Earnings Of Subsidiaries | 0 | 0 | 0 | 0
Net Realized Gains Losses | (155) | 19 | (475) | 35
Losses and loss expenses | 5,052 | 4,868 | 13,865 | 13,457
Policy benefits | 158 | 127 | 515 | 428
Policy acquisition costs and administrative expenses | 2,355 | 2,223 | 6,831 | 6,590
Interest (income) expense | 138 | 164 | 418 | 488
Other (income) expense | (57) | (145) | (326) | (307)
Amortization of purchased intangibles | 76 | 83 | 229 | 253
Chubb integration expenses | 2 | 16 | 9 | 39
Income tax expense | 230 | 183 | 626 | 536
Net income | 1,091 | 1,231 | 3,281 | 3,607
Comprehensive income (loss) | 1,473 | 592 | 6,250 | 1,322
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 | 1 | 2 | 3 | 5
Equity In Earnings Of Subsidiaries | 1,053 | 1,177 | 3,147 | 3,440
Net Realized Gains Losses | (4) | (1) | 1 | (1)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 22 | 23 | 64 | 64
Interest (income) expense | (59) | (75) | (187) | (231)
Other (income) expense | (7) | (9) | (19) | (18)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 0 | 3 | 0 | 7
Income tax expense | 3 | 5 | 12 | 15
Net income | 1,091 | 1,231 | 3,281 | 3,607
Comprehensive income (loss) | 1,473 | 592 | 6,250 | 1,322
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 | (13) | 12
Equity In Earnings Of Subsidiaries | 824 | 709 | 2,345 | 2,048
Net Realized Gains Losses | 68 | 18 | 34 | 67
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | (5) | (90) | (25) | (49)
Interest (income) expense | 171 | 203 | 536 | 616
Other (income) expense | (3) | 12 | 1 | 28
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 0 | 1 | 2 | 2
Income tax expense | (33) | (24) | (120) | (119)
Net income | 759 | 628 | 1,972 | 1,649
Comprehensive income (loss) | 1,138 | 47 | 4,476 | (199)
Other Chubb Limited Subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 8,622 | 8,110 | 24,278 | 23,229
Net premiums earned | 8,327 | 7,908 | 23,355 | 22,599
Net investment income | 875 | 818 | 2,578 | 2,440
Equity In Earnings Of Subsidiaries | 0 | 0 | 0 | 0
Net Realized Gains Losses | (219) | 2 | (510) | (31)
Losses and loss expenses | 5,052 | 4,868 | 13,865 | 13,457
Policy benefits | 158 | 127 | 515 | 428
Policy acquisition costs and administrative expenses | 2,338 | 2,290 | 6,792 | 6,575
Interest (income) expense | 26 | 36 | 69 | 103
Other (income) expense | (47) | (148) | (308) | (317)
Amortization of purchased intangibles | 76 | 83 | 229 | 253
Chubb integration expenses | 2 | 12 | 7 | 30
Income tax expense | 260 | 202 | 734 | 640
Net income | 1,118 | 1,258 | 3,520 | 3,839
Comprehensive income (loss) | 1,517 | 640 | 6,486 | 1,606
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
Equity In Earnings Of Subsidiaries | (1,877) | (1,886) | (5,492) | (5,488)
Net Realized Gains Losses | 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 | (1,877) | (1,886) | (5,492) | (5,488)
Comprehensive income (loss) | $ (2,655) | $ (687) | $ (10,962) | $ (1,407)

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