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Segment information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Operations By Segment |
For the Year Ended December 31, 2018 (in millions of U.S. dollars) | 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 |
Net premiums written | $ | 12,485 |  |  | $ | 4,674 |  |  | $ | 1,577 |  |  | $ | 8,902 |  |  | $ | 671 |  |  | $ | 2,270 |  |  | $ | — |  |  | $ | 30,579 |
Net premiums earned | 12,402 |  |  | 4,593 |  |  | 1,569 |  |  | 8,612 |  |  | 670 |  |  | 2,218 |  |  | — |  |  | 30,064 |
Losses and loss expenses | 8,000 |  |  | 3,229 |  |  | 1,111 |  |  | 4,429 |  |  | 479 |  |  | 766 |  |  | 53 |  |  | 18,067 |
Policy benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 590 |  |  | — |  |  | 590 |
Policy acquisition costs | 1,829 |  |  | 939 |  |  | 79 |  |  | 2,346 |  |  | 162 |  |  | 557 |  |  | — |  |  | 5,912 |
Administrative expenses | 966 |  |  | 269 |  |  | (9 | ) |  | 1,014 |  |  | 41 |  |  | 310 |  |  | 295 |  |  | 2,886 |
Underwriting income (loss) | 1,607 |  |  | 156 |  |  | 388 |  |  | 823 |  |  | (12 | ) |  | (5 | ) |  | (348 | ) |  | 2,609 |
Net investment income (loss) | 2,033 |  |  | 236 |  |  | 28 |  |  | 619 |  |  | 257 |  |  | 341 |  |  | (209 | ) |  | 3,305 |
Other (income) expense | (25 | ) |  | 1 |  |  | 2 |  |  | — |  |  | (32 | ) |  | 26 |  |  | (406 | ) |  | (434 | )
Amortization expense of purchased intangibles | — |  |  | 13 |  |  | 28 |  |  | 41 |  |  | — |  |  | 2 |  |  | 255 |  |  | 339 |
Segment income (loss) | $ | 3,665 |  |  | $ | 378 |  |  | $ | 386 |  |  | $ | 1,401 |  |  | $ | 277 |  |  | $ | 308 |  |  | $ | (406 | ) |  | $ | 6,009 |
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  |  |  |  |  | (652 | ) |  | (652 | )
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 641 |  |  | 641 |
Chubb integration expenses |  |  |  |  |  |  |  |  |  |  |  |  | 59 |  |  | 59 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 695 |  |  | 695 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (2,453 | ) |  | $ | 3,962 |
For the Year Ended December 31, 2017 (in millions of U.S. dollars) | 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 |
Net premiums written | $ | 12,019 |  |  | $ | 4,533 |  |  | $ | 1,516 |  |  | $ | 8,350 |  |  | $ | 685 |  |  | $ | 2,141 |  |  | $ | — |  |  | $ | 29,244 |
Net premiums earned | 12,191 |  |  | 4,399 |  |  | 1,508 |  |  | 8,131 |  |  | 704 |  |  | 2,101 |  |  | — |  |  | 29,034 |
Losses and loss expenses | 8,287 |  |  | 3,265 |  |  | 1,036 |  |  | 4,281 |  |  | 561 |  |  | 739 |  |  | 285 |  |  | 18,454 |
Policy benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 676 |  |  | — |  |  | 676 |
Policy acquisition costs | 1,873 |  |  | 899 |  |  | 81 |  |  | 2,221 |  |  | 177 |  |  | 530 |  |  | — |  |  | 5,781 |
Administrative expenses | 981 |  |  | 264 |  |  | (8 | ) |  | 982 |  |  | 44 |  |  | 303 |  |  | 267 |  |  | 2,833 |
Underwriting income (loss) | 1,050 |  |  | (29 | ) |  | 399 |  |  | 647 |  |  | (78 | ) |  | (147 | ) |  | (552 | ) |  | 1,290 |
Net investment income (loss) | 1,961 |  |  | 226 |  |  | 25 |  |  | 610 |  |  | 273 |  |  | 313 |  |  | (283 | ) |  | 3,125 |
Other (income) expense | 1 |  |  | 4 |  |  | 2 |  |  | (4 | ) |  | (1 | ) |  | (84 | ) |  | (318 | ) |  | (400 | )
Amortization expense of purchased intangibles | — |  |  | 16 |  |  | 29 |  |  | 45 |  |  | — |  |  | 2 |  |  | 168 |  |  | 260 |
Segment income (loss) | $ | 3,010 |  |  | $ | 177 |  |  | $ | 393 |  |  | $ | 1,216 |  |  | $ | 196 |  |  | $ | 248 |  |  | $ | (685 | ) |  | $ | 4,555 |
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  |  |  |  |  |  | 84 |  |  | 84 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 607 |  |  | 607 |
Chubb integration expense |  |  |  |  |  |  |  |  |  |  |  |  | 310 |  |  | 310 |
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | (139 | ) |  | (139 | )
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | (1,379 | ) |  | $ | 3,861 |
For the Year Ended December 31, 2016 (in millions of U.S. dollars) | 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 |
Net premiums written | $ | 11,740 |  |  | $ | 4,153 |  |  | $ | 1,328 |  |  | $ | 8,124 |  |  | $ | 676 |  |  | $ | 2,124 |  |  | $ | — |  |  | $ | 28,145 |
Net premiums earned | 12,217 |  |  | 4,319 |  |  | 1,316 |  |  | 8,132 |  |  | 710 |  |  | 2,055 |  |  | — |  |  | 28,749 |
Losses and loss expenses | 7,439 |  |  | 2,558 |  |  | 893 |  |  | 4,005 |  |  | 325 |  |  | 663 |  |  | 169 |  |  | 16,052 |
Policy benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 588 |  |  | — |  |  | 588 |
Policy acquisition costs | 2,023 |  |  | 966 |  |  | 83 |  |  | 2,136 |  |  | 187 |  |  | 509 |  |  | — |  |  | 5,904 |
Administrative expenses | 1,125 |  |  | 363 |  |  | (6 | ) |  | 1,057 |  |  | 52 |  |  | 307 |  |  | 183 |  |  | 3,081 |
Underwriting income (loss) | 1,630 |  |  | 432 |  |  | 346 |  |  | 934 |  |  | 146 |  |  | (12 | ) |  | (352 | ) |  | 3,124 |
Net investment income (loss) | 1,860 |  |  | 207 |  |  | 20 |  |  | 600 |  |  | 263 |  |  | 283 |  |  | (368 | ) |  | 2,865 |
Other (income) expense | (2 | ) |  | 6 |  |  | 1 |  |  | (11 | ) |  | (4 | ) |  | 5 |  |  | (217 | ) |  | (222 | )
Amortization expense (benefit) of purchased intangibles | — |  |  | 19 |  |  | 29 |  |  | 48 |  |  | — |  |  | 3 |  |  | (80 | ) |  | 19 |
Segment income (loss) | $ | 3,492 |  |  | $ | 614 |  |  | $ | 336 |  |  | $ | 1,497 |  |  | $ | 413 |  |  | $ | 263 |  |  | $ | (423 | ) |  | $ | 6,192 |
Net realized gains (losses) including OTTI |  |  |  |  |  |  |  |  |  |  |  |  | (145 | ) |  | (145 | )
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 605 |  |  | 605 |
Chubb Integration Expense |  |  |  |  |  |  |  |  |  |  |  |  | 492 |  |  | 492 |
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  | 815 |  |  | 815 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ | (2,480 | ) |  | $ | 4,135 |
Net Premiums Earned For Segment By Product | The following table presents net premiums earned for each segment by line of business:
| For the Year Ended December 31 |
(in millions of U.S. dollars) | 2018 |  |  | 2017 |  |  | 2016 |
North America Commercial P&C Insurance |  |  |  |  |
Property & other short-tail lines | $ | 1,861 |  |  | $ | 1,899 |  |  | $ | 1,963 |
Casualty & all other | 9,773 |  |  | 9,554 |  |  | 9,552 |
A&H | 768 |  |  | 738 |  |  | 702 |
Total North America Commercial P&C Insurance | 12,402 |  |  | 12,191 |  |  | 12,217 |
North America Personal P&C Insurance |  |  |  |  |
Personal automobile | 803 |  |  | 742 |  |  | 699 |
Personal homeowners | 3,127 |  |  | 3,014 |  |  | 3,007 |
Personal other | 663 |  |  | 643 |  |  | 613 |
Total North America Personal P&C Insurance | 4,593 |  |  | 4,399 |  |  | 4,319 |
North America Agricultural Insurance | 1,569 |  |  | 1,508 |  |  | 1,316 |
Overseas General Insurance |  |  |  |  |
Property & other short-tail lines | 2,134 |  |  | 2,076 |  |  | 2,133 |
Casualty & all other | 2,429 |  |  | 2,266 |  |  | 2,177 |
Personal lines | 1,784 |  |  | 1,609 |  |  | 1,626 |
A&H | 2,265 |  |  | 2,180 |  |  | 2,196 |
Total Overseas General Insurance | 8,612 |  |  | 8,131 |  |  | 8,132 |
Global Reinsurance |  |  |  |  |
Property & other short-tail lines | 123 |  |  | 132 |  |  | 118 |
Property catastrophe | 170 |  |  | 198 |  |  | 185 |
Casualty & all other | 377 |  |  | 374 |  |  | 407 |
Total Global Reinsurance | 670 |  |  | 704 |  |  | 710 |
Life Insurance |  |  |  |  |
Life | 1,022 |  |  | 980 |  |  | 1,002 |
A&H | 1,196 |  |  | 1,121 |  |  | 1,053 |
Total Life Insurance | 2,218 |  |  | 2,101 |  |  | 2,055 |
Total net premiums earned | $ | 30,064 |  |  | $ | 29,034 |  |  | $ | 28,749 |
Net Premiums Earned by Geographic Region |
| North America |  |  | Europe (1) |  |  | Asia Pacific / Far East |  |  | Latin America |
2018 | 70 | % |  | 11 | % |  | 12 | % |  | 7 | %
2017 | 70 | % |  | 11 | % |  | 12 | % |  | 7 | %
2016 | 70 | % |  | 12 | % |  | 11 | % |  | 7 | %

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