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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Changes in AOCI    
Balance at the beginning of the period $ 69,470  
Other comprehensive income/(loss) retained in AOCI (1,437) $ 1,284
Other comprehensive (income)/loss reclassified to earnings, cash flow hedges 25  
Other comprehensive (income)/loss reclassified to earnings, pension and OPEB 53 (38)
Total before tax impact (1,359) 1,286
Income tax on amounts retained in AOCI 110 28
Income tax on amounts reclassified to earnings (29) (12)
Tax impact 81 16
Other 55  
Balance at the end of the period 70,305  
Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, cash flow hedges 32  
Other comprehensive income (loss), reclassification adjustment to earnings, cash flow hedge   28
Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, cash flow hedges 0  
Other comprehensive income (loss), reclassification adjustment to earnings, cash flow hedge   (1)
Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, cash flow hedges 2  
Other comprehensive income (loss), reclassification adjustment to earnings, cash flow hedge   4
Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings, cash flow hedges (9)  
Other comprehensive income (loss), reclassification adjustment to earnings, cash flow hedge   9
Accumulated other comprehensive income    
Changes in AOCI    
Balance at the beginning of the period 2,672 (973)
Balance at the end of the period 1,449 329
Cash Flow Hedge    
Changes in AOCI    
Balance at the beginning of the period (770)  
Other comprehensive income/(loss) retained in AOCI (312)  
Total before tax impact (287)  
Income tax on amounts retained in AOCI 121  
Income tax on amounts reclassified to earnings (14)  
Tax impact 107  
Balance at the end of the period (950)  
Cash Flow Hedge | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 32  
Cash Flow Hedge | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 2  
Cash Flow Hedge | Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings (9)  
Cash Flow Hedges    
Changes in AOCI    
Balance at the beginning of the period   (644)
Other comprehensive income/(loss) retained in AOCI   70
Total before tax impact   110
Income tax on amounts retained in AOCI   (9)
Income tax on amounts reclassified to earnings   (11)
Tax impact   (20)
Balance at the end of the period   (554)
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   28
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   4
Cash Flow Hedges | Other contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   9
Net Investment Hedges    
Changes in AOCI    
Balance at the beginning of the period (598) (139)
Other comprehensive income/(loss) retained in AOCI 109 (213)
Total before tax impact 109 (213)
Income tax on amounts retained in AOCI (15) 29
Tax impact (15) 29
Balance at the end of the period (504) (323)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at the beginning of the period 4,323 77
Other comprehensive income/(loss) retained in AOCI (1,242) 1,425
Total before tax impact (1,242) 1,425
Balance at the end of the period 3,081 1,502
Equity Investees    
Changes in AOCI    
Balance at the beginning of the period 34 10
Other comprehensive income/(loss) retained in AOCI 8 2
Total before tax impact 8 2
Income tax on amounts retained in AOCI 4 8
Tax impact 4 8
Balance at the end of the period 46 20
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at the beginning of the period (317) (277)
Other comprehensive (income)/loss reclassified to earnings 53 (38)
Total before tax impact 53 (38)
Income tax on amounts reclassified to earnings (15) (1)
Tax impact (15) (1)
Other 55  
Balance at the end of the period $ (224) $ (316)