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Net Income (loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017 (in millions, except per share amounts):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Income from continuing operations
$
638

 
$
29

 
$
1,045

 
$
1,064

Income from discontinued operations, net of income taxes
4

 
—

 
4

 
—

Net income
$
642

 
$
29

 
$
1,049

 
$
1,064

Denominator:
 
 
 
 
 
 
 
Weighted average shares of common stock - basic
992

 
1,076

 
1,001

 
1,080

Dilutive effect of equity incentive awards
12

 
15

 
15

 
17

Weighted average shares of common stock - diluted
1,004

 
1,091

 
1,016

 
1,097

 
 
 
 
 
 
 
 
Income per share - basic:
 
 
 
 
 
 
 
Continuing operations
$
0.64

 
$
0.03

 
$
1.04

 
$
0.99

Discontinued operations
—

 
—

 
—

 
—

Net income per share - basic
$
0.64

 
$
0.03

 
$
1.04

 
$
0.99

Income per share - diluted:
 
 
 
 
 
 
 
Continuing operations
$
0.64

 
$
0.03

 
$
1.03

 
$
0.97

Discontinued operations
—

 
—

 
—

 
—

Net income per share - diluted
$
0.64

 
$
0.03

 
$
1.03

 
$
0.97

Common stock equivalents excluded from income per diluted share because their effect would have been anti-dilutive
15

 
1

 
13

 
16