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Inventory (Components of Inventory) (Details) - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory [Abstract]
Fuel	$ 382	$ 404
Materials	408	365
Inventory Total	$ 790	$ 769

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a))
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+ Details

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Period Type:	instant

X

- References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
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- Definition

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.

+ References

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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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