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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Cash Flow Information |
(CAD$ in millions) |  | December 31, 2018 |  |  | December 31, 2017 |
Cash and cash equivalents |  |  |  |  |  |  |  |
Cash |  | $ | 438 |  |  | $ | 230 |
Investments with maturities from the date of acquisition of three months or less |  |  | 1,296 |  |  |  | 722 |
|  | $ | 1,734 |  |  | $ | 952 |
|  | 2018 |  |  | 2017 |
(CAD$ in millions) |  |  |  |  | (restated) |
Net change in non-cash working capital items |  |  |  |  |  |  |  |
Trade and settlements receivables |  | $ | 282 |  |  | $ | (44 | )
Prepaids and other current assets |  |  | (26 | ) |  |  | (145 | )
Inventories |  |  | (338 | ) |  |  | (27 | )
Trade accounts payable and other liabilities |  |  | 53 |  |  |  | 385 |
|  | $ | (29 | ) |  | $ | 169 |

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