Selected quarterly data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

For the quarter ended	2021								2020
(in millions of Canadian dollars, except per share data)	Dec. 31		Sep. 30		Jun. 30		Mar. 31		Dec. 31		Sep. 30		Jun. 30		Mar. 31
Total revenues	$	2,040	$	1,942	$	2,054	$	1,959	$	2,012	$	1,863	$	1,792	$	2,043
Operating income	832		774		820		780		928		779		770		834
Net income	532		472		1,246		602		802		598		635		409
Basic earnings per share(1)	$	0.74	$	0.71	$	1.87	$	0.90	$	1.19	$	0.88	$	0.94	$	0.60
Diluted earnings per share(1)	$	0.74	$	0.70	$	1.86	$	0.90	$	1.19	$	0.88	$	0.93	$	0.60

(1) Earnings per share for the four quarters combined may not equal earnings per share for the year due to rounding.