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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Number Of Shares Used In the Earnings Per Share Calculations The number of shares used and the earnings per share calculations are reconciled as follows:
(in millions of Canadian dollars, except per share data)
2018

2017

2016

Net income
$
1,951

$
2,405

$
1,599

Weighted average basic shares outstanding (millions)
142.9

145.9

149.6

Dilutive effect of weighted average number of stock options (millions)
0.4

0.4

0.9

Weighted average diluted shares outstanding (millions)
143.3

146.3

150.5

Earnings per share – basic
$
13.65

$
16.49

$
10.69

Earnings per share – diluted
$
13.61

$
16.44

$
10.63