Selected Quarterly Data (Unaudited) Selected Quarterly Data (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

For the quarter ended	2020								2019
(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	$	2,012	$	1,863	$	1,792	$	2,043	$	2,069	$	1,979	$	1,977	$	1,767
Operating income	928		779		770		834		890		869		822		543
Net income	802		598		635		409		664		618		724		434
Basic earnings per share(1)	$	5.97	$	4.42	$	4.68	$	2.99	$	4.84	$	4.47	$	5.19	$	3.10
Diluted earnings per share(1)	$	5.95	$	4.41	$	4.66	$	2.98	$	4.82	$	4.46	$	5.17	$	3.09

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