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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings per share [abstract]  
Schedule of 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.