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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Changes in AOCI    
Balance at beginning of year $ 68,893  
Other comprehensive income/(loss) retained in AOCI (1,754) $ 1,125
Other comprehensive (income)/loss reclassified to earnings (1,755) 1,175
Income tax on amounts retained in AOCI (9) 4
Income tax on amounts reclassified to earnings 1 (10)
Tax impact (8) (6)
Balance at end of year 68,076 68,778
Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 26 22
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 (3) 43
Total    
Changes in AOCI    
Balance at beginning of year 7,115 2,303
Balance at end of year 5,352 3,472
Cash Flow Hedges    
Changes in AOCI    
Balance at beginning of year 407 320
Other comprehensive (income)/loss reclassified to earnings 4 36
Income tax on amounts retained in AOCI   (4)
Income tax on amounts reclassified to earnings (4) (3)
Tax impact (4) (7)
Balance at end of year 407 349
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 26 22
Cash Flow Hedges | Commodity contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   (1)
Cash Flow Hedges    
Changes in AOCI    
Other comprehensive income/(loss) retained in AOCI (22) 15
Excluded Components of Fair Value Hedges    
Changes in AOCI    
Balance at beginning of year (14) (23)
Other comprehensive income/(loss) retained in AOCI 12 (34)
Other comprehensive (income)/loss reclassified to earnings 9 9
Income tax on amounts retained in AOCI 4 8
Income tax on amounts reclassified to earnings 1 (10)
Tax impact 5 (2)
Balance at end of year 0 (16)
Excluded Components of Fair Value Hedges | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings (3) 43
Net Investment Hedges    
Changes in AOCI    
Balance at beginning of year (2,033) (728)
Other comprehensive income/(loss) retained in AOCI 216 (357)
Other comprehensive (income)/loss reclassified to earnings 216 (357)
Tax impact 0 0
Balance at end of year (1,817) (1,085)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at beginning of year 8,452 2,653
Other comprehensive (income)/loss reclassified to earnings (2,048) 1,498
Tax impact 0 0
Balance at end of year 6,404 4,151
Cumulative Translation Adjustment    
Changes in AOCI    
Other comprehensive income/(loss) retained in AOCI (2,048) 1,498
Equity Investees and Other Investments    
Changes in AOCI    
Balance at beginning of year 1 11
Other comprehensive income/(loss) retained in AOCI 26 3
Other comprehensive (income)/loss reclassified to earnings 26 3
Tax impact 0 0
Balance at end of year 27 14
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at beginning of year 302 70
Other comprehensive income/(loss) retained in AOCI 62  
Other comprehensive (income)/loss reclassified to earnings (24) (14)
Other comprehensive (income)/loss reclassified to earnings 38 (14)
Income tax on amounts retained in AOCI (13)  
Income tax on amounts reclassified to earnings 4 3
Tax impact (9) 3
Balance at end of year $ 331 $ 59