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Derivatives Instruments (Realized and Unrealized Gains (Losses) with Respect to Cash Flow Hedges) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) in Net income	$ 28	$ (1)
Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain on equity derivatives	0
Operating, maintenance and general expense
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain on equity derivatives	1
Total gains (losses) in Net income	$ 27
Interest rate swaps | Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain on equity derivatives		(1)
Interest rate swaps | Operating, maintenance and general expense
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain on equity derivatives		0
Total gains (losses) in Net income		$ 0

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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