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Consolidated Statements of Comprehensive Income - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statement of comprehensive income [abstract]    
Net income for the year $ 1,680 $ 1,558
Defined benefit pension plans:    
Remeasurements 293 592
Related income tax expense (78) (157)
Defined benefit pension plans 215 435
Equity investments measured at fair value through other comprehensive income (FVTOCI):    
(Decrease) increase in fair value (349) 10
Related income tax recovery (expense) 47 (3)
Equity investments measured at FVTOCI (302) 7
Items that will not be reclassified to net income (87) 442
Cash flow hedging derivative instruments:    
Unrealized gain (loss) in fair value of derivative instruments 115 (210)
Reclassification to net income of (gain) loss on debt derivatives (1,215) 50
Reclassification to net income or property, plant and equipment of (gain) loss on expenditure derivatives (19) 100
Reclassification to net income for accrued interest (16) (15)
Related income tax recovery 102 42
Cash flow hedging derivative instruments (1,033) (33)
Share of other comprehensive income of equity-accounted investments, net of tax 10 2
Items that may subsequently be reclassified to net income (1,023) (31)
Other comprehensive (loss) income for the year (1,110) 411
Comprehensive income for the year $ 570 $ 1,969