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Inventory (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
12. Inventory
Fuel	$ 232	$ 213
Raw Materials	235	241
Emission Credits	0	20
Inventory, Net, Total	$ 467	$ 474

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Carrying amount as of the balance sheet date of emission credits form the Acid Rain Program for sulphur dioxide emissions and the Regional Greenhouse Gas Initiative (RGGI) 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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Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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