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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Stockholders' Equity Note [Abstract]  
Earnings Per Share Table
The following provides a reconciliation between basic and diluted EPS attributable to common stockholders:
 
Three Months Ended 
 March 31,
millions except per-share amounts
2017
 
2016
Net income (loss)
 
 
 
Net income (loss) attributable to common stockholders
$
(318
)
 
$
(1,034
)
Income (loss) effect of TEUs
(2
)
 
(1
)
Basic
$
(320
)
 
$
(1,035
)
Diluted
$
(320
)
 
$
(1,035
)
Shares
 
 
 
Average number of common shares outstanding—basic
551

 
509

Average number of common shares outstanding—diluted
551

 
509

Excluded due to anti-dilutive effect
11

 
10

Net income (loss) per common share
 
 
 
Basic
$
(0.58
)
 
$
(2.03
)
Diluted
$
(0.58
)
 
$
(2.03
)