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Segment information | 3 Months Ended
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Mar. 31, 2017
Segment Reporting [Abstract] |
Segment information | Segment information Chubb operates through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. Corporate primarily includes loss and loss expenses of asbestos and environmental (A&E) run-off liabilities, and the results of our non-insurance companies including Chubb Limited, Chubb Group Management and Holdings Ltd, and Chubb INA Holdings Inc. Our exposure to A&E claims principally arises out of liabilities acquired when we purchased Westchester Specialty in 1998, CIGNA’s P&C business in 1999, and legacy Chubb Corp run-off business in 2016. For segment reporting purposes, certain items are presented in a different manner below than in the consolidated financial statements. Management uses underwriting income as the main measure of segment performance. Chubb calculates underwriting income by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. To calculate segment income, include net investment income, other (income) expense, and amortization of purchased intangibles. For the Life Insurance segment, management includes Net investment income and (Gains) losses from fair value changes in separate account assets that do not qualify for separate account reporting under GAAP as components of Life Insurance underwriting income. For example, for the three months ended March 31, 2017, Life Insurance underwriting income of $64 million includes Net investment income of $75 million and gains from fair value changes in separate account assets of $30 million. The gains from fair value changes in separate account assets are reported in Other (income) expense in the table below. The following tables present the Statement of Operations by segment:
| North America Commercial P&C Insurance |  |  | North America Personal P&C Insurance |  |  | North America Agricultural Insurance |  |  | Overseas General Insurance |  |  | Global Reinsurance |  |  | Life Insurance |  |  | Corporate |  |  | Chubb Consolidated |
For the Three Months Ended |  |  |  |  |  |
March 31, 2017 |  |  |  |  |  |
(in millions of U.S. dollars) |  |  |  |  |  |
Net premiums written | $ | 2,742 |  |  | $ | 984 |  |  | $ | 61 |  |  | $ | 2,200 |  |  | $ | 199 |  |  | $ | 524 |  |  | $ | — |  |  | $ | 6,710 |
Net premiums earned | 3,041 |  |  | 1,086 |  |  | 14 |  |  | 1,936 |  |  | 189 |  |  | 506 |  |  | — |  |  | 6,772 |
Losses and loss expenses | 1,860 |  |  | 633 |  |  | (73 | ) |  | 1,071 |  |  | 94 |  |  | 193 |  |  | 11 |  |  | 3,789 |
Policy benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 168 |  |  | — |  |  | 168 |
Policy acquisition costs | 487 |  |  | 217 |  |  | (1 | ) |  | 529 |  |  | 51 |  |  | 114 |  |  | — |  |  | 1,397 |
Administrative expenses | 231 |  |  | 65 |  |  | (5 | ) |  | 245 |  |  | 10 |  |  | 72 |  |  | 58 |  |  | 676 |
Underwriting income (loss) | 463 |  |  | 171 |  |  | 93 |  |  | 91 |  |  | 34 |  |  | (41 | ) |  | (69 | ) |  | 742 |
Net investment income (loss) | 478 |  |  | 55 |  |  | 6 |  |  | 148 |  |  | 62 |  |  | 75 |  |  | (79 | ) |  | 745 |
Other (income) expense | 4 |  |  | 1 |  |  | — |  |  | (1 | ) |  | — |  |  | (29 | ) |  | (45 | ) |  | (70 | )
Amortization expense of purchased intangibles | — |  |  | 3 |  |  | 7 |  |  | 11 |  |  | — |  |  | 1 |  |  | 42 |  |  | 64 |
Segment income (loss) | $ | 937 |  |  | $ | 222 |  |  | $ | 92 |  |  | $ | 229 |  |  | $ | 96 |  |  | $ | 62 |  |  | $ | (145 | ) |  | $ | 1,493 |
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  |  |  |  |  | (7 | ) |  | (7 | )
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 154 |  |  | 154 |
Chubb integration expenses |  |  |  |  |  |  |  |  |  |  |  |  | 111 |  |  | 111 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 128 |  |  | 128 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ | (545 | ) |  | $ | 1,093 |
| North America Commercial P&C Insurance |  |  | North America Personal P&C Insurance |  |  | North America Agricultural Insurance |  |  | Overseas General Insurance |  |  | Global Reinsurance |  |  | Life Insurance |  |  | Corporate |  |  | Chubb Consolidated |
For the Three Months Ended |  |  |  |  |
March 31, 2016 |  |  |  |  |
(in millions of U.S. dollars) |  |  |  |  |
Net premiums written | $ | 2,302 |  |  | $ | 871 |  |  | $ | 64 |  |  | $ | 2,041 |  |  | $ | 201 |  |  | $ | 516 |  |  | $ | — |  |  | $ | 5,995 |
Net premiums earned | 2,896 |  |  | 1,024 |  |  | 23 |  |  | 1,955 |  |  | 202 |  |  | 497 |  |  | — |  |  | 6,597 |
Losses and loss expenses | 1,747 |  |  | 661 |  |  | (30 | ) |  | 1,021 |  |  | 89 |  |  | 177 |  |  | 9 |  |  | 3,674 |
Policy benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 126 |  |  | — |  |  | 126 |
Policy acquisition costs | 482 |  |  | 249 |  |  | 4 |  |  | 503 |  |  | 53 |  |  | 122 |  |  | — |  |  | 1,413 |
Administrative expenses | 266 |  |  | 88 |  |  | (4 | ) |  | 263 |  |  | 14 |  |  | 72 |  |  | 73 |  |  | 772 |
Underwriting income (loss) | 401 |  |  | 26 |  |  | 53 |  |  | 168 |  |  | 46 |  |  | — |  |  | (82 | ) |  | 612 |
Net investment income (loss) | 426 |  |  | 47 |  |  | 5 |  |  | 146 |  |  | 67 |  |  | 67 |  |  | (84 | ) |  | 674 |
Other (income) expense | — |  |  | 1 |  |  | — |  |  | (5 | ) |  | (1 | ) |  | 6 |  |  | 27 |  |  | 28 |
Amortization expense (benefit) of purchased intangibles | — |  |  | 8 |  |  | 7 |  |  | 11 |  |  | — |  |  | 1 |  |  | (20 | ) |  | 7 |
Segment income (loss) | $ | 827 |  |  | $ | 64 |  |  | $ | 51 |  |  | $ | 308 |  |  | $ | 114 |  |  | $ | 60 |  |  | $ | (173 | ) |  | $ | 1,251 |
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  |  |  |  |  |  | (394 | ) |  | (394 | )
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 146 |  |  | 146 |
Chubb integration expenses |  |  |  |  |  |  |  |  |  |  |  |  | 148 |  |  | 148 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 124 |  |  | 124 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (985 | ) |  | $ | 439 |
Underwriting assets are reviewed in total by management for purposes of decision-making. Other than Unpaid losses and loss expenses, Reinsurance recoverables, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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