INCOME TAXES - Rate Reconciliation (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INCOME TAX RATE RECONCILIATION
Earnings before income taxes	$ 7,879	$ 4,542	$ 7,729
Canadian federal statutory income tax rate	15.00%	15.00%	15.00%
Expected federal taxes at statutory rate	$ 1,182	$ 681	$ 1,159
Increase/(decrease) resulting from:
Provincial and state income taxes	411	108	228
Foreign and other statutory rate differentials	187	295	134
Effects of rate-regulated accounting	(106)	(122)	(139)
Write-off of regulatory deferrals	115	0	0
Part VI.1 tax, net of federal Part I deduction	66	76	73
US minimum tax	100	107	0
Non-taxable portion of gain on sale of investment	0	0	(23)
Valuation allowance	(12)	6	5
Accounting impairment of non-deductible goodwill	0	370	0
Noncontrolling interests	19	9	(17)
Investment and production tax credits	(47)	0	0
Other	(94)	74	(5)
Income tax expense	$ 1,821	$ 1,604	$ 1,415
Effective income tax rate (as a percent)	23.10%	35.30%	18.30%

Effective Income Tax Rate Reconciliation, Base Erosion And Anti-Abuse Tax, Amount

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to taxes on preferred dividends paid, net of allowable deductions.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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