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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of inventories [Abstract] |
Disclosure Of The Components Of Inventories | The components of inventory are as follows:
As at Dec. 31 | 2019 | 2018
Parts and materials | 108 |  | 113 |
Coal | 130 |  | 108 |
Deferred stripping costs | 6 |  | 7 |
Natural gas | 3 |  | 4 |
Purchased emission credits | 4 |  | 10 |
Total | 251 |  | 242 |
Disclosure Of The Change In Inventory | The change in inventory is as follows:
Balance, Dec. 31, 2017 | 219 |
Net addition | 20 |
Change in foreign exchange rates | 3 |
Balance, Dec. 31, 2018 | 242 |
Net addition | 12 |
Change in foreign exchange rates | (3) |
Balance, Dec. 31, 2019 | 251 |

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