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Net Income (loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
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