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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Changes in AOCI    
Balance at the beginning of the period $ 58,135  
Balance at the end of the period 62,132  
Accumulated other comprehensive income    
Changes in AOCI    
Balance at the beginning of the period (973) $ 1,058
Other comprehensive income/(loss) retained in AOCI 2,129 (718)
Other comprehensive (income)/loss reclassified to earnings, Pension and OPEB 31 10
Total before tax impact 2,234 (639)
Income tax on amounts retained in AOCI 42 15
Income tax on amounts reclassified to earnings (26) (26)
Tax impact 16 (11)
Balance at the end of the period 1,277 408
Accumulated other comprehensive income | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 67 71
Accumulated other comprehensive income | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges (1) (4)
Accumulated other comprehensive income | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 5 2
Accumulated other comprehensive income | Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 3  
Cash Flow Hedges    
Changes in AOCI    
Balance at the beginning of the period (644) (746)
Other comprehensive income/(loss) retained in AOCI 100 (44)
Total before tax impact 174 25
Income tax on amounts retained in AOCI (13) 12
Income tax on amounts reclassified to earnings (18) (23)
Tax impact (31) (11)
Balance at the end of the period (501) (732)
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 67 71
Cash Flow Hedges | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings (1) (4)
Cash Flow Hedges | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 5 2
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 (139) (629)
Other comprehensive income/(loss) retained in AOCI (328) 222
Total before tax impact (328) 222
Income tax on amounts retained in AOCI 45 (2)
Tax impact 45 (2)
Balance at the end of the period (422) (409)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at the beginning of the period 77 2,700
Other comprehensive income/(loss) retained in AOCI 2,354 (899)
Total before tax impact 2,354 (899)
Balance at the end of the period 2,431 1,801
Equity Investees    
Changes in AOCI    
Balance at the beginning of the period 10 37
Other comprehensive income/(loss) retained in AOCI 3 3
Total before tax impact 3 3
Income tax on amounts retained in AOCI 10 5
Tax impact 10 5
Balance at the end of the period 23 45
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at the beginning of the period (277) (304)
Other comprehensive (income)/loss reclassified to earnings 31 10
Total before tax impact 31 10
Income tax on amounts reclassified to earnings (8) (3)
Tax impact (8) (3)
Balance at the end of the period $ (254) $ (297)