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Net Income (loss) Per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Net Income (loss) Per Share Net Income (loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) for the period by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) for the period by the weighted average number of shares of common stock and potentially dilutive common stock outstanding during the period. The dilutive effect of outstanding options and equity incentive awards is reflected in diluted net income (loss) per share by application of the treasury stock method. The calculation of diluted net income (loss) per share excludes all anti-dilutive common shares.

The following table presents the computation of basic and diluted net income (loss) per share (in millions, except per share amounts):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Income (loss) from continuing operations
$
2,528

 
$
(1,013
)
 
$
7,285

Income (loss) from discontinued operations, net of income taxes
2

 
(4
)
 
(19
)
Net income (loss)
$
2,530

 
$
(1,017
)
 
$
7,266

Denominator:
 
 
 
 
 
Weighted average shares of common stock - basic
980

 
1,064

 
1,133

Dilutive effect of equity incentive awards
11

 
—

 
11

Weighted average shares of common stock - diluted
991

 
1,064

 
1,144

Income (loss) per share - basic:
 
 
 
 
 
Continuing operations
$
2.58

 
$
(0.95
)
 
$
6.43

Discontinued operations
—

 
—

 
(0.02
)
Net income (loss) per share - basic
$
2.58

 
$
(0.95
)
 
$
6.41

Income (loss) per share - diluted:
 
 
 
 
 
Continuing operations
$
2.55

 
$
(0.95
)
 
$
6.37

Discontinued operations
—

 
—

 
(0.02
)
Net income (loss) per share - diluted
$
2.55

 
$
(0.95
)
 
$
6.35

Common stock equivalents excluded from income per diluted share because their effect would have been anti-dilutive
12

 
46

 
8