INCOME TAXES - Components (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings before income taxes
Earnings before income taxes	$ 7,879	$ 4,542	$ 7,729
Current income taxes
Total current income taxes	401	647	324
Deferred income taxes
Total deferred income taxes	1,420	957	1,091
Income tax expense	1,821	1,604	1,415
Financial instruments	271	456
Canada
Earnings before income taxes
Domestic	2,233	583	3,399
Current income taxes
Domestic	100	360	162
Deferred income taxes
Domestic	456	(358)	344
US
Earnings before income taxes
Foreign	4,620	2,865	3,336
Current income taxes
Foreign	191	201	80
Deferred income taxes
Foreign	974	1,309	741
Other
Earnings before income taxes
Foreign	1,026	1,094	994
Current income taxes
Foreign	110	86	82
Deferred income taxes
Foreign	$ (10)	$ 6	$ 6