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Net Income (loss) Per Share
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Income (loss) from continuing operations
$
(1,012
)
 
$
7,285

 
$
1,947

Income (loss) from discontinued operations, net of income taxes
(4
)
 
(19
)
 
(222
)
Net income
$
(1,016
)
 
$
7,266

 
$
1,725

Denominator:
 
 
 
 
 
Weighted average shares of common stock - basic
1,064

 
1,133

 
1,208

Dilutive effect of equity incentive awards
—

 
11

 
12

Weighted average shares of common stock - diluted
1,064

 
1,144

 
1,220

Income (loss) per share - basic:
 
 
 
 
 
Continuing operations
$
(0.95
)
 
$
6.43

 
$
1.61

Discontinued operations
—

 
(0.02
)
 
(0.18
)
Net income (loss) per share - basic
$
(0.95
)
 
$
6.41

 
$
1.43

Income (loss) per share - diluted:
 
 
 
 
 
Continuing operations
$
(0.95
)
 
$
6.37

 
$
1.60

Discontinued operations
—

 
(0.02
)
 
(0.18
)
Net income (loss) per share - diluted
$
(0.95
)
 
$
6.35

 
$
1.42

Common stock equivalents excluded from income per diluted share because their effect would have been anti-dilutive
46

 
8

 
2