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Consolidated statement of comprehensive income - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ 2,200	$ 2,314	$ 490
Other comprehensive income (loss), net of income taxes
Postretirement benefits liability adjustment (excluding amortization)	(505)	158	(54)
Amortization of postretirement benefits liability adjustment included in net periodic benefit costs	111	140	136
Total other comprehensive income (loss)	(394)	298	82
Comprehensive income (loss)	$ 1,806	$ 2,612	$ 572

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