COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Changes in AOCI
Balance at the beginning of the period	$ 73,435
Other comprehensive income/(loss) retained in AOCI	(2,852)	$ 2,129
Total before tax impact	(2,724)	2,234
Income tax on amounts retained in AOCI	160	42
Income tax on amounts reclassified to earnings	(39)	(26)
Tax impact	121	16
Other	55
Balance at the end of the period	72,805	68,232
Total
Changes in AOCI
Balance at the beginning of the period	2,672	(973)
Balance at the end of the period	124	1,277
Cash Flow Hedges
Changes in AOCI
Balance at the beginning of the period	(770)
Other comprehensive income/(loss) retained in AOCI	(618)
Total before tax impact	(547)
Income tax on amounts retained in AOCI	196
Income tax on amounts reclassified to earnings	(25)
Tax impact	171
Balance at the end of the period	(1,146)
Cash Flow Hedges \| Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	72
Cash Flow Hedges \| Foreign exchange contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	2
Cash Flow Hedges \| Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	(3)
Cash Flow Hedges
Changes in AOCI
Balance at the beginning of the period		(644)
Other comprehensive income/(loss) retained in AOCI		100
Total before tax impact		174
Income tax on amounts retained in AOCI		(13)
Income tax on amounts reclassified to earnings		(18)
Tax impact		(31)
Balance at the end of the period		(501)
Cash Flow Hedges \| Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings		67
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		5
Cash Flow Hedges \| Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings		3
Net Investment Hedges
Changes in AOCI
Balance at the beginning of the period	(598)	(139)
Other comprehensive income/(loss) retained in AOCI	252	(328)
Total before tax impact	252	(328)
Income tax on amounts retained in AOCI	(31)	45
Tax impact	(31)	45
Balance at the end of the period	(377)	(422)
Cumulative Translation Adjustment
Changes in AOCI
Balance at the beginning of the period	4,323	77
Other comprehensive income/(loss) retained in AOCI	(2,508)	2,354
Total before tax impact	(2,508)	2,354
Balance at the end of the period	1,815	2,431
Equity Investees
Changes in AOCI
Balance at the beginning of the period	34	10
Other comprehensive income/(loss) retained in AOCI	22	3
Total before tax impact	22	3
Income tax on amounts retained in AOCI	(5)	10
Tax impact	(5)	10
Balance at the end of the period	51	23
Pension and OPEB Adjustment
Changes in AOCI
Balance at the beginning of the period	(317)	(277)
Other comprehensive (income)/loss reclassified to earnings	57	31
Total before tax impact	57	31
Income tax on amounts reclassified to earnings	(14)	(8)
Tax impact	(14)	(8)
Other	55
Balance at the end of the period	$ (219)	$ (254)

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