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

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

For the quarter ended	2019								2018
(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	$	2,069	$	1,979	$	1,977	$	1,767	$	2,006	$	1,898	$	1,750	$	1,662
Operating income	890		869		822		543		874		790		627		540
Net income	664		618		724		434		545		622		436		348
Basic earnings per share(1)	$	4.84	$	4.47	$	5.19	$	3.10	$	3.84	$	4.36	$	3.05	$	2.41
Diluted earnings per share(1)	4.82		4.46		5.17		3.09		3.83		4.35		3.04		2.41

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