v3.26.1
COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Changes in AOCI    
Balance at beginning of year $ 62,333  
Other comprehensive income/(loss) retained in AOCI 975 $ 55
Other comprehensive (income)/loss reclassified to earnings (9) (9)
Other comprehensive (income)/loss reclassified to earnings 968 66
Income tax on amounts retained in AOCI (1) 10
Income tax on amounts reclassified to earnings 4 (3)
Tax impact 3 7
Balance at end of year 64,970  
Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 2 8
Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   12
Total    
Changes in AOCI    
Balance at beginning of year 4,681 7,115
Balance at end of year 5,652 7,188
Cash Flow Hedges    
Changes in AOCI    
Balance at beginning of year 462 407
Other comprehensive income/(loss) retained in AOCI 3 (35)
Other comprehensive (income)/loss reclassified to earnings 5 (27)
Income tax on amounts retained in AOCI (1) 9
Income tax on amounts reclassified to earnings   (2)
Tax impact (1) 7
Balance at end of year 466 387
Cash Flow Hedges | Interest rate contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings 2 8
Excluded Components of Fair Value Hedges    
Changes in AOCI    
Balance at beginning of year   (14)
Other comprehensive income/(loss) retained in AOCI   (6)
Other comprehensive (income)/loss reclassified to earnings   6
Income tax on amounts retained in AOCI   1
Income tax on amounts reclassified to earnings   (3)
Tax impact   (2)
Balance at end of year   (10)
Excluded Components of Fair Value Hedges | Foreign exchange contracts    
Changes in AOCI    
Other comprehensive (income)/loss reclassified to earnings   12
Net Investment Hedges    
Changes in AOCI    
Balance at beginning of year (1,614) (2,033)
Other comprehensive income/(loss) retained in AOCI (248) (34)
Other comprehensive (income)/loss reclassified to earnings (248) (34)
Tax impact 0 0
Balance at end of year (1,862) (2,067)
Cumulative Translation Adjustment    
Changes in AOCI    
Balance at beginning of year 5,372 8,452
Other comprehensive income/(loss) retained in AOCI 1,240 118
Other comprehensive (income)/loss reclassified to earnings 1,240 118
Tax impact 0 0
Balance at end of year 6,612 8,570
Equity Investees and Other Investments    
Changes in AOCI    
Balance at beginning of year 25 1
Other comprehensive income/(loss) retained in AOCI (20) 12
Other comprehensive (income)/loss reclassified to earnings (20) 12
Tax impact 0 0
Balance at end of year 5 13
Pension and OPEB Adjustment    
Changes in AOCI    
Balance at beginning of year 436 302
Other comprehensive (income)/loss reclassified to earnings (9) (9)
Other comprehensive (income)/loss reclassified to earnings (9) (9)
Income tax on amounts reclassified to earnings 4 2
Tax impact 4 2
Balance at end of year $ 431 $ 295