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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2018
Earnings per share [abstract]  
Earnings (Loss) Per Share
Details of the calculation of the net income (loss) and the weighted average number of shares used in the earnings per share computations are as follows:    
For the years ended December 31,
2018
 
2017
 
Common shareholders' net income (loss) for basic earnings per share
 
$
2,522

 
$
2,149

Add: increase in income due to convertible instruments(1)
 
10

 
10

Common shareholders' net income (loss) on a diluted basis
 
$
2,532

 
$
2,159

Weighted average number of common shares outstanding for basic earnings per share (in millions)
 
606

 
613

Add: dilutive impact of stock options(2) (in millions)
 
1

 
1

Add: dilutive impact of convertible instruments(1) (in millions)
 
4

 
4

Weighted average number of common shares outstanding on a diluted basis (in millions)
 
611

 
618

Basic earnings (loss) per share
 
$
4.16

 
$
3.51

Diluted earnings (loss) per share
 
$
4.14

 
$
3.49


(1) The convertible instruments are the SLEECS B issued by Sun Life Capital Trust.
(2) 
Excludes the impact of 1 million stock options for the year ended December 31, 2018 ($nil for the year ended December 31, 2017) because these stock options were antidilutive for the period.