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Net Income (loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of basic and diluted net income (loss) per share
The following table sets forth the computation of basic and diluted net income (loss) per share for the three and six months ended June 30, 2017 and 2016 (in millions, except per share amounts):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Income from continuing operations
$
27

 
$
437

 
$
1,062

 
$
919

Loss from discontinued operations, net of income taxes
—

 
(2
)
 
—

 
(2
)
Net income
$
27

 
$
435

 
$
1,062

 
$
917

Denominator:
 
 
 
 
 
 
 
Weighted average shares of common stock - basic
1,076

 
1,144

 
1,080

 
1,151

Dilutive effect of equity incentive awards
15

 
5

 
17

 
8

Weighted average shares of common stock - diluted
1,091

 
1,149

 
1,097

 
1,159

 
 
 
 
 
 
 
 
Income (loss) per share - basic:
 
 
 
 
 
 
 
Continuing operations
$
0.03

 
$
0.38

 
$
0.98

 
$
0.80

Discontinued operations
—

 
—

 
—

 
—

Net income per share - basic
$
0.03

 
$
0.38

 
$
0.98

 
$
0.80

Income (loss) per share - diluted:
 
 
 
 
 
 
 
Continuing operations
$
0.02

 
$
0.38

 
$
0.97

 
$
0.79

Discontinued operations
—

 
—

 
—

 
—

Net income per share - diluted
$
0.02

 
$
0.38

 
$
0.97

 
$
0.79

Common stock equivalents excluded from income per diluted share because their effect would have been anti-dilutive
1

 
15

 
16

 
14