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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | $ 8,355 | $ 8,343 | $ 16,332 | $ 15,656
Net premiums earned | 8,128 | 7,891 | 15,922 | 15,028
Net investment income | 827 | 859 | 1,688 | 1,695
Equity In Earnings Of Subsidiaries | 0 | 0 | 0 | 0
Net Realized Gains Losses | 30 | (223) | (928) | (320)
Losses and loss expenses | 6,577 | 4,715 | 11,062 | 8,813
Policy benefits | 223 | 161 | 352 | 357
Policy acquisition costs and administrative expenses | 2,320 | 2,302 | 4,676 | 4,476
Interest (income) expense | 128 | 140 | 260 | 280
Other (income) expense | 58 | (230) | 113 | (269)
Amortization of purchased intangibles | 72 | 77 | 145 | 153
Chubb integration expenses | 0 | 4 | 0 | 7
Income tax benefit | (62) | 208 | 153 | 396
Net income (loss) | (331) | 1,150 | (79) | 2,190
Comprehensive income (loss) | 2,860 | 2,059 | 400 | 4,777
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 | 0 | 1 | (2) | 2
Equity In Earnings Of Subsidiaries | (366) | 1,104 | (110) | 2,094
Net Realized Gains Losses | 23 | 4 | 2 | 5
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 21 | 22 | 45 | 42
Interest (income) expense | (35) | (62) | (69) | (128)
Other (income) expense | (8) | (6) | (17) | (12)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses |  | 0 |  | 0
Income tax benefit | 10 | 5 | 10 | 9
Net income (loss) | (331) | 1,150 | (79) | 2,190
Comprehensive income (loss) | 2,860 | 2,059 | 400 | 4,777
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 | 1 | (6) | 5 | (10)
Equity In Earnings Of Subsidiaries | (271) | 762 | 322 | 1,521
Net Realized Gains Losses | (192) | (21) | (79) | (34)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | (30) | (5) | (68) | (20)
Interest (income) expense | 149 | 180 | 297 | 365
Other (income) expense | (5) | 1 | 3 | 4
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses |  | 0 |  | 2
Income tax benefit | (66) | (45) | (59) | (87)
Net income (loss) | (510) | 604 | 75 | 1,213
Comprehensive income (loss) | 1,872 | 1,397 | 672 | 3,338
Other Chubb Limited Subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 8,355 | 8,343 | 16,332 | 15,656
Net premiums earned | 8,128 | 7,891 | 15,922 | 15,028
Net investment income | 826 | 864 | 1,685 | 1,703
Equity In Earnings Of Subsidiaries | 0 | 0 | 0 | 0
Net Realized Gains Losses | 199 | (206) | (851) | (291)
Losses and loss expenses | 6,577 | 4,715 | 11,062 | 8,813
Policy benefits | 223 | 161 | 352 | 357
Policy acquisition costs and administrative expenses | 2,329 | 2,285 | 4,699 | 4,454
Interest (income) expense | 14 | 22 | 32 | 43
Other (income) expense | 71 | (225) | 127 | (261)
Amortization of purchased intangibles | 72 | 77 | 145 | 153
Chubb integration expenses |  | 4 |  | 5
Income tax benefit | (6) | 248 | 202 | 474
Net income (loss) | (127) | 1,262 | 137 | 2,402
Comprehensive income (loss) | 3,078 | 2,181 | 660 | 4,969
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 | 637 | (1,866) | (212) | (3,615)
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
Income tax benefit | 0 | 0 | 0 | 0
Net income (loss) | 637 | (1,866) | (212) | (3,615)
Comprehensive income (loss) | $ (4,950) | $ (3,578) | $ (1,332) | $ (8,307)

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