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Investments Subject to Significant Influence and Equity Income (Equity Method) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	$ 1,418	$ 1,382
Income (loss) from equity investments and subsidiaries	129	143
Equity Method Investment, Summarized Financial Information [Abstract]
Other long-term liabilities	825	868
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	1,418	1,382
Income (loss) from equity investments and subsidiaries	129	143
Equity Method Investee | Emera Inc.
Equity Method Investment, Summarized Financial Information [Abstract]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	9
LIL | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	740	682
Income (loss) from equity investments and subsidiaries	$ 58	54
Percentage of Ownership	31.90%
LIL | Equity Method Investee | Emera Inc.
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership	31.90%
LIL | Equity Method Investee | Class B units | NSP Maritime Link Inc Project
Schedule of Equity Method Investments [Line Items]
100% ownership	100.00%
LIL | Equity Method Investee | Total Units Issued [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership	24.50%
NSPML | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	$ 501	533
Income (loss) from equity investments and subsidiaries	$ 29	49
NSPML | Equity Method Investee | NSP Maritime Link Inc Project
Schedule of Equity Method Investments [Line Items]
100% ownership	100.00%
M&NP | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	$ 128	123
Income (loss) from equity investments and subsidiaries	$ 21	20
Percentage of Ownership	12.90%
M&NP | Equity Method Investee | Emera Inc.
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership	12.90%
Lucelec | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	$ 49	44
Income (loss) from equity investments and subsidiaries	$ 4	4
Percentage of Ownership	19.50%
Lucelec | Equity Method Investee | Emera Inc.
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership	19.50%
Bear Swamp
Equity Method Investment, Summarized Financial Information [Abstract]
Other long-term liabilities	$ 95	104	$ 179
Bear Swamp | Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Investments subject to significant influence	0	0
Income (loss) from equity investments and subsidiaries	$ 17	$ 16
Percentage of Ownership	50.00%
Bear Swamp | Equity Method Investee | Emera Inc.
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership	50.00%
Maritime Link And LIL | Plan, subject to approval
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership	49.00%

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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