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Selected Quarterly Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Data (Unaudited) Selected quarterly data (unaudited)
For the quarter ended
2017
 
2016
(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
$
1,713

$
1,595

$
1,643

$
1,603

 
$
1,637

$
1,554

$
1,450

$
1,591

Operating income
753

690

679

671

 
717

657

551

653

Net income
984

510

480

431

 
384

347

328

540

Basic earnings per share(1)
$
6.79

$
3.50

$
3.28

$
2.94

 
$
2.63

$
2.35

$
2.16

$
3.53

Diluted earnings per share(1)
6.77

3.50

3.27

2.93

 
2.61

2.34

2.15

3.51

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