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Net Income (loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
Income (loss) from continuing operations
$
1,792

 
$
2,528

 
$
(1,013
)
Income (loss) from discontinued operations, net of income taxes
(6
)
 
2

 
(4
)
Net income (loss)
$
1,786

 
$
2,530

 
$
(1,017
)
Denominator:
 
 
 
 
 
Weighted average shares of common stock - basic
849

 
980

 
1,064

Dilutive effect of equity incentive awards
7

 
11

 
—

Weighted average shares of common stock - diluted
856

 
991

 
1,064

Income (loss) per share - basic:
 
 
 
 
 
Continuing operations
$
2.11

 
$
2.58

 
$
(0.95
)
Discontinued operations
(0.01
)
 
—

 
—

Net income (loss) per share - basic
$
2.10

 
$
2.58

 
$
(0.95
)
Income (loss) per share - diluted:
 
 
 
 
 
Continuing operations
$
2.10

 
$
2.55

 
$
(0.95
)
Discontinued operations
(0.01
)
 
—

 
—

Net income (loss) per share - diluted
$
2.09

 
$
2.55

 
$
(0.95
)
Common stock equivalents excluded from income per diluted share because their effect would have been anti-dilutive
18

 
12

 
46