INCOME TAXES - COMPONENTS (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings/(loss) before income taxes and discontinued operations
Earnings before income taxes	$ 7,729	$ 4,190	$ 7,535
Current income taxes
Total current income taxes	324	327	552
Deferred income taxes
Total deferred income taxes	1,091	447	1,156
Income tax expense	1,415	774	1,708
Canada
Earnings/(loss) before income taxes and discontinued operations
Domestic	3,399	2,789	3,560
Current income taxes
Domestic	162	165	347
Deferred income taxes
Domestic	344	378	490
US
Earnings/(loss) before income taxes and discontinued operations
Foreign	3,336	407	3,115
Current income taxes
Foreign	80	64	107
Deferred income taxes
Foreign	741	66	672
Other
Earnings/(loss) before income taxes and discontinued operations
Foreign	994	994	860
Current income taxes
Foreign	82	98	98
Deferred income taxes
Foreign	$ 6	$ 3	$ (6)