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Inventory | 12 Months Ended
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Dec. 31, 2017
Inventory [Abstract] |
INVENTORY |
13. INVENTORY |  |  |  |
Inventory consisted of the following: |  |  |  |
As at | December 31 | December 31
millions of Canadian dollars |  | 2017 |  | 2016
Fuel | $ | 180 | $ | 235
Materials |  | 216 |  | 215
Emission credits (1) |  | 22 |  | 22
| $ | 418 | $ | 472
(1)The NEGG Facilities are subject to the Acid Rain Program for sulphur dioxide emissions and the Regional Greenhouse Gas Initiative for carbon dioxide emissions. The emissions credits inventory balance represents the credits purchased to offset the other current liabilities and other long-term liabilities associated with these programs.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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