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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)
 12 Months Ended
Dec. 31, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)
Changes in AOCI attributable to our common shareholders for the years ended December 31, 2024, 2023 and 2022 are as follows:

Cash Flow HedgesExcluded Components of Fair Value HedgesNet Investment HedgesCumulative Translation AdjustmentEquity InvesteesPension and OPEB AdjustmentTotal
(millions of Canadian dollars)      
Balance as at January 1, 2024320 (23)(728)2,653 11 70 2,303 
Other comprehensive income/(loss) retained in AOCI79 (42)(1,305)5,799 (9)323 4,845 
Other comprehensive (income)/loss reclassified to earnings      
Interest rate contracts1
31 — — — — — 31 
Commodity contracts2
(1)— — — — — (1)
Foreign exchange contracts3
— 53 — — — — 53 
Amortization of pension and OPEB actuarial gain4
— — — — — (21)(21)
 109 11 (1,305)5,799 (9)302 4,907 
Tax impact      
Income tax on amounts retained in AOCI(15)10 — — (1)(75)(81)
Income tax on amounts reclassified to earnings(7)(12)— — — 5 (14)
 (22)(2)— — (1)(70)(95)
Balance as at December 31, 2024407 (14)(2,033)8,452 1 302 7,115 

Cash Flow HedgesExcluded Components of Fair Value HedgesNet Investment HedgesCumulative Translation AdjustmentEquity InvesteesPension and OPEB AdjustmentTotal
(millions of Canadian dollars)
Balance as at January 1, 2023121 (35)(1,137)4,348 5 218 3,520 
Other comprehensive income/(loss) retained in AOCI
232 62 409 (1,695)6 (158)(1,144)
Other comprehensive (income)/loss reclassified to earnings
Interest rate contracts1
28 — — — — — 28 
Foreign exchange contracts3
— (47)— — — — (47)
Amortization of pension and OPEB actuarial gain4
— — — — — (24)(24)
260 15 409 (1,695)6 (182)(1,187)
Tax impact
Income tax on amounts retained in AOCI(47)(14)— — — 28 (33)
Income tax on amounts reclassified to earnings(14)11 — — — 6 3 
(61)(3)— — — 34 (30)
Balance as at December 31, 2023320 (23)(728)2,653 11 70 2,303 
Cash Flow HedgesExcluded Components of Fair Value HedgesNet Investment HedgesCumulative Translation AdjustmentEquity InvesteesPension and OPEB AdjustmentTotal
(millions of Canadian dollars)
Balance as at January 1, 2022(897)— (166)56 (5)(84)(1,096)
Other comprehensive income/(loss) retained in AOCI
1,125 (35)(971)4,292 (6)411 4,816 
Other comprehensive (income)/loss reclassified to earnings
Interest rate contracts1
186 — — — — — 186 
Foreign exchange contracts3
(4)— — — — — (4)
Other contracts5
4 — — — — — 4 
Amortization of pension and OPEB actuarial gain4
— — — — — (14)(14)
Other— — — — 16 — 16 
1,311 (35)(971)4,292 10 397 5,004 
Tax impact
Income tax on amounts retained in AOCI(250)— — — — (99)(349)
Income tax on amounts reclassified to earnings(43)— — — — 4 (39)
(293)— — — — (95)(388)
Balance as at December 31, 2022121 (35)(1,137)4,348 5 218 3,520 
1Reported within Interest expense in the Consolidated Statements of Earnings.
2Reported within Transportation and other services revenues in the Consolidated Statements of Earnings.
3Reported within Interest expense and Other income/(expense) in the Consolidated Statements of Earnings.
4These components are included in the computation of net periodic benefit credit and are reported within Other income/(expense) in the Consolidated Statements of Earnings.
5Reported within Operating and administrative expense in the Consolidated Statements of Earnings.