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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Changes in AOCI    
Balance at the beginning of the period $ 58,135  
Balance at the end of the period 61,432  
Accumulated other comprehensive income    
Changes in AOCI    
Balance at the beginning of the period (973) $ 1,058
Other comprehensive income/(loss) retained in AOCI 1,284 347
Other comprehensive (income)/loss reclassified to earnings, Pension and OPEB (38) 6
Total before tax impact 1,286 391
Income tax on amounts retained in AOCI 28 (1)
Income tax on amounts reclassified to earnings (12) (10)
Tax impact 16 (11)
Balance at the end of the period 329 1,438
Accumulated other comprehensive income | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 28 31
Accumulated other comprehensive income | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges (1) (2)
Accumulated other comprehensive income | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 4  
Accumulated other comprehensive income | Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges 9 9
Cash Flow Hedges    
Changes in AOCI    
Balance at the beginning of the period (644) (746)
Other comprehensive income/(loss) retained in AOCI 70 (1)
Total before tax impact 110 37
Income tax on amounts retained in AOCI (9) (1)
Income tax on amounts reclassified to earnings (11) (8)
Tax impact (20) (9)
Balance at the end of the period (554) (718)
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 28 31
Cash Flow Hedges | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings (1) (2)
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 9 9
Net Investment Hedges    
Changes in AOCI    
Balance at the beginning of the period (139) (629)
Other comprehensive income/(loss) retained in AOCI (213) 50
Total before tax impact (213) 50
Income tax on amounts retained in AOCI 29 (1)
Tax impact 29 (1)
Balance at the end of the period (323) (580)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at the beginning of the period 77 2,700
Other comprehensive income/(loss) retained in AOCI 1,425 293
Total before tax impact 1,425 293
Balance at the end of the period 1,502 2,993
Equity Investees    
Changes in AOCI    
Balance at the beginning of the period 10 37
Other comprehensive income/(loss) retained in AOCI 2 5
Total before tax impact 2 5
Income tax on amounts retained in AOCI 8 1
Tax impact 8 1
Balance at the end of the period 20 43
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at the beginning of the period (277) (304)
Other comprehensive (income)/loss reclassified to earnings (38) 6
Total before tax impact (38) 6
Income tax on amounts reclassified to earnings (1) (2)
Tax impact (1) (2)
Balance at the end of the period $ (316) $ (300)