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Summary of significant accounting policies Summary of Significant Accounting Policies (Tables) (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |
Schedule of Cash and Cash Equivalents [Table Text Block] | The following table provides a reconciliation of cash and restricted cash reported within the Consolidated balance sheets that total to the amounts shown in the Consolidated statements of cash flows:
| December 31 |
(in millions of U.S. dollars) | 2018 |  |  | 2017 |  |  | 2016 |
Cash | $ | 1,247 |  |  | $ | 728 |  |  | $ | 985 |
Restricted cash | 93 |  |  | 123 |  |  | 103 |
Total cash and restricted cash shown in the Consolidated statements of cash flows | $ | 1,340 |  |  | $ | 851 |  |  | $ | 1,088 |

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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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