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Defined Benefit Obligation and Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract] |
Components of Defined Benefit Obligations and Other Long-Term Liabilities | The components of defined benefit obligation and other long-term liabilities are as follows:
As at Dec. 31 | 2017 |  | 2016 |
Defined benefit obligation (Note 27) | 235 |  | 208 |
Deferred coal revenues | 60 |  | 62 |
Long-term incentive accruals (Note 26) | 16 |  | 14 |
Other | 48 |  | 46 |
Total | 359 |  | 330 |

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- Definition Components of Noncurrent Defined Benefit Plan Liabilities and Other Long-Term Liabilities [Table Text Block] + References No definition available. + Details
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