COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Changes in AOCI
Balance at the beginning of the period	$ 73,435
Other comprehensive income/(loss) retained in AOCI	(2,483)	$ 1,422
Other comprehensive (income)/loss reclassified to earnings	59	36
Total before tax impact	(2,316)	1,565
Income tax on amounts retained in AOCI	227	15
Income tax on amounts reclassified to earnings	(49)	(37)
Tax impact	178	(22)
Other	48
Balance at the end of the period	72,676	67,898
Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	108	92
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	4	6
Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	(4)	10
Total
Changes in AOCI
Balance at the beginning of the period	2,672	(973)
Balance at the end of the period	582	570
Cash Flow Hedges
Changes in AOCI
Balance at the beginning of the period	(770)
Other comprehensive income/(loss) retained in AOCI	(845)
Total before tax impact	(737)
Income tax on amounts retained in AOCI	254
Income tax on amounts reclassified to earnings	(34)
Tax impact	220
Balance at the end of the period	(1,287)
Cash Flow Hedges \| Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	108
Cash Flow Hedges \| Foreign exchange contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	4
Cash Flow Hedges \| Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings	(4)
Cash Flow Hedges
Changes in AOCI
Balance at the beginning of the period		(644)
Other comprehensive income/(loss) retained in AOCI		167
Total before tax impact		274
Income tax on amounts retained in AOCI		(26)
Income tax on amounts reclassified to earnings		(29)
Tax impact		(55)
Balance at the end of the period		(425)
Cash Flow Hedges \| Interest rate contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings		92
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		6
Cash Flow Hedges \| Other contracts
Changes in AOCI
Other comprehensive (income)/loss reclassified to earnings		10
Net Investment Hedges
Changes in AOCI
Balance at the beginning of the period	(598)	(139)
Other comprehensive income/(loss) retained in AOCI	167	(232)
Total before tax impact	167	(232)
Income tax on amounts retained in AOCI	(20)	32
Tax impact	(20)	32
Balance at the end of the period	(451)	(339)
Cumulative Translation Adjustment
Changes in AOCI
Balance at the beginning of the period	4,323	77
Other comprehensive income/(loss) retained in AOCI	(1,831)	1,495
Total before tax impact	(1,831)	1,495
Balance at the end of the period	2,492	1,572
Equity Investees
Changes in AOCI
Balance at the beginning of the period	34	10
Other comprehensive income/(loss) retained in AOCI	26	(8)
Total before tax impact	26	(8)
Income tax on amounts retained in AOCI	(7)	9
Tax impact	(7)	9
Balance at the end of the period	46	11
Pension and OPEB Adjustment
Changes in AOCI
Balance at the beginning of the period	(317)	(277)
Other comprehensive (income)/loss reclassified to earnings	59	36
Total before tax impact	59	36
Income tax on amounts reclassified to earnings	(15)	(8)
Tax impact	(15)	(8)
Other	55
Balance at the end of the period	$ (218)	$ (249)

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