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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
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Condensed Statement of Income Captions [Line Items] |  |
Net premiums written | $ 7,977 | $ 7,313
Net premiums earned | 7,794 | 7,137
Net investment income | 861 | 836
Equity In Earnings Of Subsidiaries | 0 | 0
Net Realized Gains Losses | (958) | (97)
Losses and loss expenses | 4,485 | 4,098
Policy benefits | 129 | 196
Policy acquisition costs and administrative expenses | 2,356 | 2,174
Interest (income) expense | 132 | 140
Other (income) expense | 55 | (39)
Amortization of purchased intangibles | 73 | 76
Chubb integration expenses | 0 | 3
Income tax expense | 215 | 188
Net income | 252 | 1,040
Comprehensive income (loss) | (2,460) | 2,718
Chubb Limited (Parent Guarantor) |  |
Condensed Statement of Income Captions [Line Items] |  |
Net premiums written | 0 | 0
Net premiums earned | 0 | 0
Net investment income | (2) | 1
Equity In Earnings Of Subsidiaries | 256 | 990
Net Realized Gains Losses | (21) | 1
Losses and loss expenses | 0 | 0
Policy benefits | 0 | 0
Policy acquisition costs and administrative expenses | 24 | 20
Interest (income) expense | (34) | (66)
Other (income) expense | (9) | (6)
Amortization of purchased intangibles | 0 | 0
Chubb integration expenses |  | 0
Income tax expense | 0 | 4
Net income | 252 | 1,040
Comprehensive income (loss) | (2,460) | 2,718
Chubb INA Holdings Inc (Subsidiary Issuer) |  |
Condensed Statement of Income Captions [Line Items] |  |
Net premiums written | 0 | 0
Net premiums earned | 0 | 0
Net investment income | 4 | (4)
Equity In Earnings Of Subsidiaries | 593 | 759
Net Realized Gains Losses | 113 | (13)
Losses and loss expenses | 0 | 0
Policy benefits | 0 | 0
Policy acquisition costs and administrative expenses | (38) | (15)
Interest (income) expense | 148 | 185
Other (income) expense | 8 | 3
Amortization of purchased intangibles | 0 | 0
Chubb integration expenses |  | 2
Income tax expense | 7 | (42)
Net income | 585 | 609
Comprehensive income (loss) | (1,200) | 1,941
Other Chubb Limited Subsidiaries |  |
Condensed Statement of Income Captions [Line Items] |  |
Net premiums written | 7,977 | 7,313
Net premiums earned | 7,794 | 7,137
Net investment income | 859 | 839
Equity In Earnings Of Subsidiaries | 0 | 0
Net Realized Gains Losses | (1,050) | (85)
Losses and loss expenses | 4,485 | 4,098
Policy benefits | 129 | 196
Policy acquisition costs and administrative expenses | 2,370 | 2,169
Interest (income) expense | 18 | 21
Other (income) expense | 56 | (36)
Amortization of purchased intangibles | 73 | 76
Chubb integration expenses |  | 1
Income tax expense | 208 | 226
Net income | 264 | 1,140
Comprehensive income (loss) | (2,418) | 2,788
Consolidating Adjustments and Eliminations |  |
Condensed Statement of Income Captions [Line Items] |  |
Net premiums written | 0 | 0
Net premiums earned | 0 | 0
Net investment income | 0 | 0
Equity In Earnings Of Subsidiaries | (849) | (1,749)
Net Realized Gains Losses | 0 | 0
Losses and loss expenses | 0 | 0
Policy benefits | 0 | 0
Policy acquisition costs and administrative expenses | 0 | 0
Interest (income) expense | 0 | 0
Other (income) expense | 0 | 0
Amortization of purchased intangibles | 0 | 0
Chubb integration expenses |  | 0
Income tax expense | 0 | 0
Net income | (849) | (1,749)
Comprehensive income (loss) | $ 3,618 | $ (4,729)

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- Definition Policy acquisition costs - Amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period. Administrative expenses - The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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