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Acquisitions Acquisitions (Tables) | 9 Months Ended
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Sep. 30, 2017
Acquisition [Abstract] |
Results of Operations From Date of Business Combination [Table Text Block] | The following table summarizes the results of the acquired Chubb Corp operations within our 2016 Consolidated statements of operations for the periods presented:
(in millions of U.S. dollars) | Three Months Ended September 30, 2016 |  |  | January 14, 2016 to September 30, 2016 |
Total revenues | $ | 2,656 |  |  | $ | 7,888 |
Net income | $ | 483 |  |  | $ | 1,064 |
Pro Forma Financial Information for the Chubb Corp Acquisition [Table Text Block] | The following table provides supplemental unaudited pro forma consolidated information for the three and nine months ended September 30, 2016, as if Chubb Corp had been acquired as of January 1, 2015. The unaudited pro forma consolidated financial statements are presented solely for informational purposes and are not necessarily indicative of the consolidated results of operations that might have been achieved had the transaction been completed as of the date indicated, nor are they meant to be indicative of any anticipated consolidated future results of operations that the combined company will experience after the transaction.
Three Months Ended |  |  | Nine Months Ended |
(in millions of U.S. dollars, except per share data) | September 30, 2016 |  |  | September 30, 2016 |
Total revenues | $ | 8,521 |  |  | $ | 23,758 |
Net income | $ | 1,345 |  |  | $ | 2,591 |
Earnings per share |  |  |
Basic earnings per share | $ | 2.87 |  |  | $ | 5.54 |
Diluted earnings per share | $ | 2.85 |  |  | $ | 5.50 |

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