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Condensed Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
| Three Months Ended |
| March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
(in millions of U.S. dollars, except per share data) | 2018 |  |  | 2018 |  |  | 2018 |  |  | 2018 |
Net premiums earned | $ | 7,027 |  |  | $ | 7,664 |  |  | $ | 7,908 |  |  | $ | 7,465 |
Net investment income | 806 |  |  | 828 |  |  | 823 |  |  | 848 |
Net realized gains (losses) including OTTI | (2 | ) |  | 18 |  |  | 19 |  |  | (687 | )
Total revenues | $ | 7,831 |  |  | $ | 8,510 |  |  | $ | 8,750 |  |  | $ | 7,626 |
Losses and loss expenses | $ | 4,102 |  |  | $ | 4,487 |  |  | $ | 4,868 |  |  | $ | 4,610 |
Policy benefits | $ | 151 |  |  | $ | 150 |  |  | $ | 127 |  |  | $ | 162 |
Net income | $ | 1,082 |  |  | $ | 1,294 |  |  | $ | 1,231 |  |  | $ | 355 |
Basic earnings per share | $ | 2.32 |  |  | $ | 2.78 |  |  | $ | 2.66 |  |  | $ | 0.77 |
Diluted earnings per share | $ | 2.30 |  |  | $ | 2.76 |  |  | $ | 2.64 |  |  | $ | 0.76 |
Net income for the three months ended December 31, 2018 included after-tax catastrophe losses of $506 million.
| Three Months Ended |
| March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
(in millions of U.S. dollars, except per share data) | 2017 |  |  | 2017 |  |  | 2017 |  |  | 2017 |
Net premiums earned | $ | 6,772 |  |  | $ | 7,237 |  |  | $ | 7,807 |  |  | $ | 7,218 |
Net investment income | 745 |  |  | 770 |  |  | 813 |  |  | 797 |
Net realized gains (losses) including OTTI | (7 | ) |  | 101 |  |  | (10 | ) |  | — |
Total revenues | $ | 7,510 |  |  | $ | 8,108 |  |  | $ | 8,610 |  |  | $ | 8,015 |
Losses and loss expenses | $ | 3,789 |  |  | $ | 4,146 |  |  | $ | 6,247 |  |  | $ | 4,272 |
Policy benefits | $ | 168 |  |  | $ | 163 |  |  | $ | 169 |  |  | $ | 176 |
Net income (loss) | $ | 1,093 |  |  | $ | 1,305 |  |  | $ | (70 | ) |  | $ | 1,533 |
Basic earnings (loss) per share | $ | 2.33 |  |  | $ | 2.79 |  |  | $ | (0.15 | ) |  | $ | 3.29 |
Diluted earnings (loss) per share | $ | 2.31 |  |  | $ | 2.77 |  |  | $ | (0.15 | ) |  | $ | 3.27 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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