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Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of cash flow statement [Abstract] |
Disclosure of non-cash operating working capital |
Year ended Dec. 31 | 2017 |  | 2016 |  | 2015 |
(Use) source: |  |  |  |  |  |
Accounts receivable | (228 | ) | (23 | ) | (77 | )
Prepaid expenses | (75 | ) | 5 |  | (3 | )
Income taxes receivable | 8 |  | (4 | ) | 1 |
Inventory | (7 | ) | 11 |  | (9 | )
Accounts payable, accrued liabilities, and provisions | 186 |  | 81 |  | (152 | )
Income taxes payable | 2 |  | 3 |  | (2 | )
Change in non-cash operating working capital | (114 | ) | 73 |  | (242 | )
Cash flows from (used in) operating activities [Text Block] | Cash Flow Information A. Change in Non-Cash Operating Working Capital
Year ended Dec. 31 | 2017 |  | 2016 |  | 2015 |
(Use) source: |  |  |  |  |  |
Accounts receivable | (228 | ) | (23 | ) | (77 | )
Prepaid expenses | (75 | ) | 5 |  | (3 | )
Income taxes receivable | 8 |  | (4 | ) | 1 |
Inventory | (7 | ) | 11 |  | (9 | )
Accounts payable, accrued liabilities, and provisions | 186 |  | 81 |  | (152 | )
Income taxes payable | 2 |  | 3 |  | (2 | )
Change in non-cash operating working capital | (114 | ) | 73 |  | (242 | )
B. Changes in Liabilities from Financing Activities
| Balance Dec. 31, 2016 |  | Cash flows |  | New leases |  | Dividends declared |  | Foreign exchange impact |  | Other |  | Balance Dec. 31, 2017 |
Long-term debt and finance lease obligations | 4,361 |  | (545 | ) | 14 |  | — |  | (115 | ) | (8 | ) | 3,707 |
Dividends payable (common and preferred) | 54 |  | (86 | ) | — |  | 64 |  | — |  | 2 |  | 34 |
Total liabilities from financing activities | 4,415 |  | (631 | ) | 14 |  | 64 |  | (115 | ) | (6 | ) | 3,741 |

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- Definition Disclosure of cash flow statement [Abstract] + References No definition available. + Details
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- Definition Disclosure of non-cash operating working capital [Table Text Block] + References No definition available. + Details
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