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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Changes in AOCI
Balance at the beginning of the period	$ 64,363
Other comprehensive income/(loss) retained in AOCI	(203)	$ 4,047
Total before tax impact	(131)	4,095
Income tax on amounts retained in AOCI	(128)	179
Income tax on amounts reclassified to earnings	(15)	(13)
Tax impact	(143)	166
Balance at the end of the period	65,988	72,291
Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	63	43
Commodity contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	1
Foreign exchange contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	1	1
Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	0
Total
Changes in AOCI
Balance at the beginning of the period	(1,401)	(272)
Balance at the end of the period	(1,675)	3,989
Cash Flow  Hedges
Changes in AOCI
Balance at the beginning of the period	(1,326)	(1,073)
Other comprehensive income/(loss) retained in AOCI	493	(693)
Total before tax impact	575	(649)
Income tax on amounts retained in AOCI	(120)	182
Income tax on amounts reclassified to earnings	(13)	(12)
Tax impact	(133)	170
Balance at the end of the period	(884)	(1,552)
Cash Flow  Hedges | Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	63	43
Cash Flow  Hedges | Commodity contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	1
Cash Flow  Hedges | Foreign exchange contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	1	1
Cash Flow  Hedges | Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	17
Excluded Components of Fair Value Hedges
Changes in AOCI
Balance at the beginning of the period	5	0
Other comprehensive income/(loss) retained in AOCI	(1)	3
Total before tax impact	(1)	3
Income tax on amounts retained in AOCI	0	0
Income tax on amounts reclassified to earnings	0	0
Tax impact	0	0
Balance at the end of the period	4	3
Net Investment Hedges
Changes in AOCI
Balance at the beginning of the period	(215)	(317)
Other comprehensive income/(loss) retained in AOCI	105	(715)
Total before tax impact	105	(715)
Income tax on amounts retained in AOCI	(12)	0
Income tax on amounts reclassified to earnings	0	0
Tax impact	(12)	0
Balance at the end of the period	(122)	(1,032)
Cumulative Translation Adjustment
Changes in AOCI
Balance at the beginning of the period	568	1,396
Other comprehensive income/(loss) retained in AOCI	(774)	5,459
Total before tax impact	(794)	5,459
Income tax on amounts retained in AOCI	0	0
Income tax on amounts reclassified to earnings	0	0
Tax impact	0	0
Balance at the end of the period	(226)	6,855
Cumulative Translation Adjustment | Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	(20)
Equity Investees
Changes in AOCI
Balance at the beginning of the period	66	67
Other comprehensive income/(loss) retained in AOCI	(26)	(7)
Total before tax impact	(23)	(7)
Income tax on amounts retained in AOCI	4	(3)
Income tax on amounts reclassified to earnings	0	0
Tax impact	4	(3)
Balance at the end of the period	47	57
Equity Investees | Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	3
Pension and OPEB Adjustment
Changes in AOCI
Balance at the beginning of the period	(499)	(345)
Other comprehensive (income)/loss reclassified to earnings	7	4
Total before tax impact	7	4
Income tax on amounts retained in AOCI	0	0
Income tax on amounts reclassified to earnings	(2)	(1)
Tax impact	(2)	(1)
Balance at the end of the period	(494)	$ (342)
Pension and OPEB Adjustment | Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	$ 0

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