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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | $ 7,902 | $ 7,573 | $ 22,193 | $ 21,207
Net premiums earned | 7,807 | 7,688 | 21,816 | 21,690
Net investment income | 813 | 739 | 2,328 | 2,121
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Net realized gains (losses) including OTTI | (10) | 100 | 84 | (510)
Losses and loss expenses | 6,247 | 4,269 | 14,182 | 12,197
Policy benefits | 169 | 155 | 500 | 427
Policy acquisition costs and administrative expenses | 2,202 | 2,286 | 6,430 | 6,860
Interest (income) expense | 150 | 152 | 451 | 451
Other (income) expense | (118) | (91) | (333) | (92)
Amortization of purchased intangibles | 65 | 4 | 194 | 16
Chubb integration expenses | 50 | 115 | 233 | 361
Income tax benefit | (85) | 277 | 243 | 556
Net income (loss) | (70) | 1,360 | 2,328 | 2,525
Comprehensive income (loss) | 629 | 1,376 | 3,711 | 4,457
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 | (85) | (2,040) | (3,731) | (4,134)
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 benefit | 0 | 0 | 0 | 0
Net income (loss) | (85) | (2,040) | (3,731) | (4,134)
Comprehensive income (loss) | (1,472) | (2,066) | (6,477) | (7,528)
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 | 1 | 3 | 3
Equity in earnings of subsidiaries | (127) | 1,292 | 2,153 | 2,331
Net realized gains (losses) including OTTI | 0 | 0 | (2) | (1)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 20 | 15 | 56 | 48
Interest (income) expense | (84) | (93) | (252) | (266)
Other (income) expense | (5) | (7) | (7) | (20)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 7 | 12 | 13 | 29
Income tax benefit | 6 | 6 | 16 | 17
Net income (loss) | (70) | 1,360 | 2,328 | 2,525
Comprehensive income (loss) | 629 | 1,376 | 3,711 | 4,457
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 | 2 | 10 | 9
Equity in earnings of subsidiaries | 212 | 748 | 1,578 | 1,803
Net realized gains (losses) including OTTI | (8) | (2) | (22) | (3)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 16 | 12 | 28 | 144
Interest (income) expense | 208 | 233 | 641 | 681
Other (income) expense | 9 | 6 | 34 | 26
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 1 | 16 | 54 | 56
Income tax benefit | (89) | (136) | (288) | (323)
Net income (loss) | 62 | 617 | 1,097 | 1,225
Comprehensive income (loss) | 748 | 627 | 2,459 | 2,687
Other Chubb Limited Subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 7,902 | 7,573 | 22,193 | 21,207
Net premiums earned | 7,807 | 7,688 | 21,816 | 21,690
Net investment income | 809 | 736 | 2,315 | 2,109
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Net realized gains (losses) including OTTI | (2) | 102 | 108 | (506)
Losses and loss expenses | 6,247 | 4,269 | 14,182 | 12,197
Policy benefits | 169 | 155 | 500 | 427
Policy acquisition costs and administrative expenses | 2,166 | 2,259 | 6,346 | 6,668
Interest (income) expense | 26 | 12 | 62 | 36
Other (income) expense | (122) | (90) | (360) | (98)
Amortization of purchased intangibles | 65 | 4 | 194 | 16
Chubb integration expenses | 42 | 87 | 166 | 276
Income tax benefit | (2) | 407 | 515 | 862
Net income (loss) | 23 | 1,423 | 2,634 | 2,909
Comprehensive income (loss) | $ 724 | $ 1,439 | $ 4,018 | $ 4,841

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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 This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition Amount of expense (income) recognized due to changes in the accrued obligation to policyholders that relates to insured events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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