v3.26.1
COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Changes in AOCI    
Balance at beginning of year $ 62,333  
Other comprehensive income/(loss) retained in AOCI 1,972 $ (2,863)
Other comprehensive (income)/loss reclassified to earnings (18) (14)
Other comprehensive (income)/loss reclassified to earnings 2,096 (2,863)
Income tax on amounts retained in AOCI (14) (14)
Income tax on amounts reclassified to earnings (30) 6
Tax impact (44) (8)
Balance at end of year 65,349  
Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 142 17
Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   (3)
Total    
Changes in AOCI    
Balance at beginning of year 4,681 7,115
Balance at end of year 6,733 4,244
Cash Flow Hedges    
Changes in AOCI    
Balance at beginning of year 462 407
Other comprehensive income/(loss) retained in AOCI 28 (15)
Other comprehensive (income)/loss reclassified to earnings 170 2
Income tax on amounts retained in AOCI (7) 2
Income tax on amounts reclassified to earnings (36) (3)
Tax impact (43) (1)
Balance at end of year 589 408
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 142 17
Excluded Components of Fair Value Hedges    
Changes in AOCI    
Balance at beginning of year   (14)
Other comprehensive income/(loss) retained in AOCI   12
Other comprehensive (income)/loss reclassified to earnings   9
Income tax on amounts retained in AOCI   (3)
Income tax on amounts reclassified to earnings   8
Tax impact   5
Balance at end of year   (0)
Excluded Components of Fair Value Hedges | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   (3)
Net Investment Hedges    
Changes in AOCI    
Balance at beginning of year (1,614) (2,033)
Other comprehensive income/(loss) retained in AOCI (495) 413
Other comprehensive (income)/loss reclassified to earnings (495) 413
Tax impact 0 0
Balance at end of year (2,109) (1,620)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at beginning of year 5,372 8,452
Other comprehensive income/(loss) retained in AOCI 2,449 (3,356)
Other comprehensive (income)/loss reclassified to earnings 2,449 (3,356)
Tax impact 0 0
Balance at end of year 7,821 5,096
Equity Investees and Other Investments    
Changes in AOCI    
Balance at beginning of year 25 1
Other comprehensive income/(loss) retained in AOCI (10) 21
Other comprehensive (income)/loss reclassified to earnings (10) 21
Income tax on amounts retained in AOCI (7)  
Tax impact (7) 0
Balance at end of year 8 22
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at beginning of year 436 302
Other comprehensive income/(loss) retained in AOCI   62
Other comprehensive (income)/loss reclassified to earnings (18) (14)
Other comprehensive (income)/loss reclassified to earnings (18) 48
Income tax on amounts retained in AOCI   (13)
Income tax on amounts reclassified to earnings 6 1
Tax impact 6 (12)
Balance at end of year $ 424 $ 338