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Selected Quarterly Data (Unaudited) Selected Quarterly Data (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Selected quarterly data (unaudited)
For the quarter ended
2016

2015
(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
$
1,637

$
1,554

$
1,450

$
1,591


$
1,687

$
1,709

$
1,651

$
1,665

Operating income
717

657

551

653


677

753

646

612

Net income
384

347

328

540


319

323

390

320

Basic earnings per share(1)
$
2.63

$
2.35

$
2.16

$
3.53


$
2.09

$
2.05

$
2.38

$
1.94

Diluted earnings per share(1)
2.61

2.34

2.15

3.51


2.08

2.04

2.36

1.92

(1) Per share net income for the four quarters combined may not equal the per share net income for the year due to rounding.