Consolidated statement of comprehensive income - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income (loss)	$ 1,212	$ 196	$ 1,505	$ 712
Other comprehensive income (loss), net of income taxes
Postretirement benefits liability adjustment (excluding amortization)	0	0	18	(19)
Amortization of postretirement benefits liability adjustment included in net periodic benefit costs	28	33	55	67
Total other comprehensive income (loss)	28	33	73	48
Comprehensive income (loss)	$ 1,240	$ 229	$ 1,578	$ 760