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Consolidated Statements of Comprehensive Income - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement of comprehensive income [abstract]    
Net income for the year $ 2,043 $ 2,059
Defined benefit pension plans:    
Remeasurements (159) 53
Related income tax recovery (expense) 40 (12)
Defined benefit pension plans (119) 41
Equity investments measured at fair value through other comprehensive income (FVTOCI):    
Increase (decrease) in fair value 737 (440)
Related income tax (expense) recovery (104) 63
Equity investments measured at FVTOCI 633 (377)
Items that will not be reclassified to net income 514 (336)
Cash flow hedging derivative instruments:    
Unrealized gain in fair value of derivative instruments 66 725
Reclassification to net income of loss (gain) on debt derivatives 458 (671)
Reclassification to net income or property, plant and equipment of gain on expenditure derivatives (61) (8)
Reclassification to net income for accrued interest (46) (43)
Related income tax expense (29) (65)
Cash flow hedging derivative instruments 388 (62)
Equity-accounted investments:    
Share of other comprehensive (loss) income of equity-accounted investments, net of tax (8) 14
Equity-accounted investments (8) 14
Items that may subsequently be reclassified to net income 380 (48)
Other comprehensive income (loss) for the year 894 (384)
Comprehensive income for the year $ 2,937 $ 1,675