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INCOME TAXES - Schedule of Components of Pretax Earnings and Income Taxes (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings before income taxes
Earnings before income taxes	$ 7,299	$ 7,879	$ 4,542
Current income taxes
Total current income taxes	949	401	647
Deferred income taxes
Total deferred income taxes	719	1,420	957
Income tax expense	1,668	1,821	1,604
Canada
Earnings before income taxes
Domestic	1,035	2,233	583
Current income taxes
Domestic	248	100	360
Deferred income taxes
Domestic	(299)	456	(358)
US
Earnings before income taxes
Foreign	5,231	4,620	2,865
Current income taxes
Foreign	578	191	201
Deferred income taxes
Foreign	1,013	974	1,309
Other
Earnings before income taxes
Foreign	1,033	1,026	1,094
Current income taxes
Foreign	123	110	86
Deferred income taxes
Foreign	$ 5	$ (10)	$ 6

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