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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in AOCI    
Balance at the beginning of the period $ 58,135  
Balance at the end of the period 60,787  
Accumulated other comprehensive income    
Changes in AOCI    
Balance at the beginning of the period (973) $ 1,058
Other comprehensive income/(loss) retained in AOCI 1,422 (2,095)
Other comprehensive (income)/loss reclassified to earnings, Pension and OPEB 36 21
Total before tax impact 1,565 (1,980)
Income tax on amounts retained in AOCI 15 13
Income tax on amounts reclassified to earnings (37) (42)
Tax impact (22) (29)
Balance at the end of the period 570 (951)
Accumulated other comprehensive income | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 92 104
Accumulated other comprehensive income | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges (1) (5)
Accumulated other comprehensive income | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 6 (2)
Accumulated other comprehensive income | Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 10 (3)
Cash Flow Hedges    
Changes in AOCI    
Balance at the beginning of the period (644) (746)
Other comprehensive income/(loss) retained in AOCI 167 29
Total before tax impact 274 123
Income tax on amounts retained in AOCI (26) (9)
Income tax on amounts reclassified to earnings (29) (34)
Tax impact (55) (43)
Balance at the end of the period (425) (666)
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 92 104
Cash Flow Hedges | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings (1) (5)
Cash Flow Hedges | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 6 (2)
Cash Flow Hedges | Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 10 (3)
Net Investment Hedges    
Changes in AOCI    
Balance at the beginning of the period (139) (629)
Other comprehensive income/(loss) retained in AOCI (232) 496
Total before tax impact (232) 496
Income tax on amounts retained in AOCI 32 9
Tax impact 32 9
Balance at the end of the period (339) (124)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at the beginning of the period 77 2,700
Other comprehensive income/(loss) retained in AOCI 1,495 (2,616)
Total before tax impact 1,495 (2,616)
Balance at the end of the period 1,572 84
Equity Investees    
Changes in AOCI    
Balance at the beginning of the period 10 37
Other comprehensive income/(loss) retained in AOCI (8) (4)
Total before tax impact (8) (4)
Income tax on amounts retained in AOCI 9 13
Tax impact 9 13
Balance at the end of the period 11 46
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at the beginning of the period (277) (304)
Other comprehensive (income)/loss reclassified to earnings 36 21
Total before tax impact 36 21
Income tax on amounts reclassified to earnings (8) (8)
Tax impact (8) (8)
Balance at the end of the period $ (249) $ (291)