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Inventory (Notes) | 12 Months Ended
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Dec. 31, 2019
Disclosure of inventories [Abstract] |
Inventory | Inventory Inventory held in the normal course of business, which includes coal, emission credits, parts and materials, and natural gas, is valued at the lower of cost and net realizable value. Inventory held for trading, which includes natural gas and emission credits and allowances, is valued at fair value less costs to sell. 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 |
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 |
No inventory is pledged as security for liabilities.

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