INCOME TAXES - Components (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings/(loss) before income taxes and discontinued operations
Earnings before income taxes	$ 4,542	$ 7,729	$ 4,190
Current income taxes
Total current income taxes	647	324	327
Deferred income taxes
Total deferred income taxes	957	1,091	447
Income tax expense	1,604	1,415	774
Canada
Earnings/(loss) before income taxes and discontinued operations
Domestic	583	3,399	2,789
Current income taxes
Domestic	360	162	165
Deferred income taxes
Domestic	(358)	344	378
US
Earnings/(loss) before income taxes and discontinued operations
Foreign	2,865	3,336	407
Current income taxes
Foreign	201	80	64
Deferred income taxes
Foreign	1,309	741	66
Other
Earnings/(loss) before income taxes and discontinued operations
Foreign	1,094	994	994
Current income taxes
Foreign	86	82	98
Deferred income taxes
Foreign	$ 6	$ 6	$ 3