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Net Income (loss) Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of basic and diluted net income per share 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