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v3.8.0.1

Information provided in connection with outstanding debt of subsidiaries (Condensed Consolidating Statement Of Operations and Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  |  |  |  |  |  |  | $ 29,244 | $ 28,145 | $ 17,713
Net premiums earned | $ 7,218 | $ 7,807 | $ 7,237 | $ 6,772 | $ 7,059 | $ 7,688 | $ 7,405 | $ 6,597 | 29,034 | 28,749 | 17,213
Net Investment Income | 797 | 813 | 770 | 745 | 744 | 739 | 708 | 674 | 3,125 | 2,865 | 2,194
Net realized gains (losses) including OTTI | 0 | (10) | 101 | (7) | 365 | 100 | (216) | (394) | 84 | (145) | (420)
Losses and loss expenses | 4,272 | 6,247 | 4,146 | 3,789 | 3,855 | 4,269 | 4,254 | 3,674 | 18,454 | 16,052 | 9,484
Policy benefits | 176 | 169 | 163 | 168 | 161 | 155 | 146 | 126 | 676 | 588 | 543
Policy acquisition costs and administrative expenses |  |  |  |  |  |  |  |  | 8,614 | 8,985 | 5,211
Interest (income) expense |  |  |  |  |  |  |  |  | 607 | 605 | 300
Other (Income) Expense |  |  |  |  |  |  |  |  | (400) | (222) | (51)
Amortization of Purchased Intangibles |  |  |  |  |  |  |  |  | 260 | 19 | 171
Chubb integration expenses |  |  |  |  |  |  |  |  | 310 | 492 | 33
Income tax expense |  |  |  |  |  |  |  |  | (139) | 815 | 462
Net income | $ 1,533 | $ (70) | $ 1,305 | $ 1,093 | $ 1,610 | $ 1,360 | $ 726 | $ 439 | 3,861 | 4,135 | 2,834
Comprehensive income |  |  |  |  |  |  |  |  | 4,718 | 4,556 | 908
Chubb limited (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  |  |  |  |  |  |  |  |  | 0
Net premiums earned |  |  |  |  |  |  |  |  |  |  | 0
Net Investment Income |  |  |  |  |  |  |  |  | 4 | 3 | 3
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 3,640 | 3,901 | 2,673
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  | 0 | 0 | 0
Losses and loss expenses |  |  |  |  |  |  |  |  |  |  | 0
Policy benefits |  |  |  |  |  |  |  |  |  |  | 0
Policy acquisition costs and administrative expenses |  |  |  |  |  |  |  |  | 75 | 64 | 63
Interest (income) expense |  |  |  |  |  |  |  |  | (332) | (353) | (32)
Other (Income) Expense |  |  |  |  |  |  |  |  | (12) | (25) | (208)
Amortization of Purchased Intangibles |  |  |  |  |  |  |  |  | 0 | 0 | 0
Chubb integration expenses |  |  |  |  |  |  |  |  | 32 | 62 | 3
Income tax expense |  |  |  |  |  |  |  |  | 20 | 21 | 16
Net income |  |  |  |  |  |  |  |  | 3,861 | 4,135 | 2,834
Comprehensive income |  |  |  |  |  |  |  |  | 4,718 | 4,556 | 908
Chubb INA Holdings Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Investment Income |  |  |  |  |  |  |  |  | 14 | 11 | 4
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 2,424 | 2,555 | 1,038
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  | (25) | 3 | (9)
Losses and loss expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Policy benefits |  |  |  |  |  |  |  |  | 0 | 0 | 0
Policy acquisition costs and administrative expenses |  |  |  |  |  |  |  |  | 40 | 82 | 28
Interest (income) expense |  |  |  |  |  |  |  |  | 847 | 908 | 302
Other (Income) Expense |  |  |  |  |  |  |  |  | 93 | 35 | (4)
Amortization of Purchased Intangibles |  |  |  |  |  |  |  |  | 0 | 0 | 0
Chubb integration expenses |  |  |  |  |  |  |  |  | 69 | 126 | 29
Income tax expense |  |  |  |  |  |  |  |  | (742) | (416) | (349)
Net income |  |  |  |  |  |  |  |  | 2,106 | 1,834 | 1,027
Comprehensive income |  |  |  |  |  |  |  |  | 3,075 | 2,001 | (192)
Other Chubb Limited Subsidiaries and Eliminations |  |  |  |  |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  |  |  |  |  |  |  | 29,244 | 28,145 | 17,713
Net premiums earned |  |  |  |  |  |  |  |  | 29,034 | 28,749 | 17,213
Net Investment Income |  |  |  |  |  |  |  |  | 3,107 | 2,851 | 2,187
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | 0
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  | 109 | (148) | (411)
Losses and loss expenses |  |  |  |  |  |  |  |  | 18,454 | 16,052 | 9,484
Policy benefits |  |  |  |  |  |  |  |  | 676 | 588 | 543
Policy acquisition costs and administrative expenses |  |  |  |  |  |  |  |  | 8,499 | 8,839 | 5,120
Interest (income) expense |  |  |  |  |  |  |  |  | 92 | 50 | 30
Other (Income) Expense |  |  |  |  |  |  |  |  | (481) | (232) | 161
Amortization of Purchased Intangibles |  |  |  |  |  |  |  |  | 260 | 19 | 171
Chubb integration expenses |  |  |  |  |  |  |  |  | 209 | 304 | 1
Income tax expense |  |  |  |  |  |  |  |  | 583 | 1,210 | 795
Net income |  |  |  |  |  |  |  |  | 3,958 | 4,622 | 2,684
Comprehensive income |  |  |  |  |  |  |  |  | 4,430 | 5,045 | 757
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  |  |  |  |  |  |  |  |  | 0
Net premiums earned |  |  |  |  |  |  |  |  |  |  | 0
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (6,064) | (6,456) | (3,711)
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  | 0 | 0 | 0
Losses and loss expenses |  |  |  |  |  |  |  |  |  |  | 0
Policy benefits |  |  |  |  |  |  |  |  |  |  | 0
Policy acquisition costs and administrative expenses |  |  |  |  |  |  |  |  |  |  | 0
Interest (income) expense |  |  |  |  |  |  |  |  |  |  | 0
Amortization of Purchased Intangibles |  |  |  |  |  |  |  |  | 0 | 0 | 0
Chubb integration expenses |  |  |  |  |  |  |  |  | 0 | 0 |
Income tax expense |  |  |  |  |  |  |  |  |  | 0 | 0
Net income |  |  |  |  |  |  |  |  | (6,064) | (6,456) | (3,711)
Comprehensive income |  |  |  |  |  |  |  |  | $ (7,505) | $ (7,046) | $ (565)

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + 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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