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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | $ 7,581 | $ 7,639 | $ 14,291 | $ 13,634
Net premiums earned | 7,237 | 7,405 | 14,009 | 14,002
Net investment income | 770 | 708 | 1,515 | 1,382
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Net realized gains (losses) including OTTI | 101 | (216) | 94 | (610)
Losses and loss expenses | 4,146 | 4,254 | 7,935 | 7,928
Policy benefits | 163 | 146 | 331 | 272
Policy acquisition costs and administrative expenses | 2,155 | 2,389 | 4,228 | 4,574
Interest (income) expense | 147 | 153 | 301 | 299
Other (income) expense | (145) | (29) | (215) | (1)
Amortization of purchased intangibles | 65 | 5 | 129 | 12
Chubb integration expenses | 72 | 98 | 183 | 246
Income tax expense | 200 | 155 | 328 | 279
Net income | 1,305 | 726 | 2,398 | 1,165
Comprehensive income (loss) | 1,675 | 1,540 | 3,082 | 3,081
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 | (1,918) | (1,213) | (3,646) | (2,094)
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
Income tax expense | 0 | 0 | 0 | 0
Net income | (1,918) | (1,213) | (3,646) | (2,094)
Comprehensive income (loss) | (2,676) | (2,685) | (5,005) | (5,462)
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 | 2 | 2
Equity in earnings of subsidiaries | 1,253 | 664 | 2,280 | 1,039
Net realized gains (losses) including OTTI | (2) | (1) | (2) | (1)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | 18 | 16 | 36 | 33
Interest (income) expense | (84) | (93) | (168) | (173)
Other (income) expense | 4 | (4) | (2) | (13)
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 6 | 14 | 6 | 17
Income tax expense | 4 | 5 | 10 | 11
Net income | 1,305 | 726 | 2,398 | 1,165
Comprehensive income (loss) | 1,675 | 1,540 | 3,082 | 3,081
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 | 4 | 3 | 7 | 7
Equity in earnings of subsidiaries | 665 | 549 | 1,366 | 1,055
Net realized gains (losses) including OTTI | (1) | (1) | (14) | (1)
Losses and loss expenses | 0 | 0 | 0 | 0
Policy benefits | 0 | 0 | 0 | 0
Policy acquisition costs and administrative expenses | (2) | 96 | 12 | 132
Interest (income) expense | 212 | 233 | 433 | 448
Other (income) expense | 10 | 10 | 25 | 20
Amortization of purchased intangibles | 0 | 0 | 0 | 0
Chubb integration expenses | 4 | (97) | 53 | 40
Income tax expense | (87) | (37) | (199) | (187)
Net income | 531 | 346 | 1,035 | 608
Comprehensive income (loss) | 920 | 1,004 | 1,711 | 2,060
Other Chubb Limited Subsidiaries |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net premiums written | 7,581 | 7,639 | 14,291 | 13,634
Net premiums earned | 7,237 | 7,405 | 14,009 | 14,002
Net investment income | 764 | 704 | 1,506 | 1,373
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Net realized gains (losses) including OTTI | 104 | (214) | 110 | (608)
Losses and loss expenses | 4,146 | 4,254 | 7,935 | 7,928
Policy benefits | 163 | 146 | 331 | 272
Policy acquisition costs and administrative expenses | 2,139 | 2,277 | 4,180 | 4,409
Interest (income) expense | 19 | 13 | 36 | 24
Other (income) expense | (159) | (35) | (238) | (8)
Amortization of purchased intangibles | 65 | 5 | 129 | 12
Chubb integration expenses | 62 | 181 | 124 | 189
Income tax expense | 283 | 187 | 517 | 455
Net income | 1,387 | 867 | 2,611 | 1,486
Comprehensive income (loss) | $ 1,756 | $ 1,681 | $ 3,294 | $ 3,402

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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=73527792&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=66902209&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=73527792&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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