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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of inventories [Abstract] |
Disclosure Of The Components Of Inventories | The components of inventory are as follows:
As at Dec. 31 | 2017 |  | 2016 |
Parts and materials | 118 |  | 110 |
Coal | 58 |  | 65 |
Deferred stripping costs | 11 |  | 12 |
Natural gas | 9 |  | 17 |
Purchased emission credits | 23 |  | 9 |
Total | 219 |  | 213 |
Disclosure Of The Change In Inventory | The change in inventory is as follows:
Balance, Dec. 31, 2015 | 219 |
Net use | (12 | )
Writedowns | (9 | )
Reversal of writedowns | 13 |
Change in foreign exchange rates | 2 |
Balance, Dec. 31, 2016 | 213 |
Net addition | 11 |
Change in foreign exchange rates | (5 | )
Balance, Dec. 31, 2017 | 219 |

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