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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 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 
 June 30,
 
Six Months Ended 
 June 30,
millions except per-share amounts
2017
 
2016
 
2017
 
2016
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
(415
)
 
$
(692
)
 
$
(733
)
 
$
(1,726
)
Income (loss) effect of TEUs
(2
)
 
(2
)
 
(4
)
 
(3
)
Basic
$
(417
)
 
$
(694
)
 
$
(737
)
 
$
(1,729
)
Income (loss) effect of TEUs
(1
)
 
(1
)
 
(1
)
 
(1
)
Diluted
$
(418
)
 
$
(695
)
 
$
(738
)
 
$
(1,730
)
Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
552

 
510

 
552

 
510

Average number of common shares outstanding—diluted
552

 
510

 
552

 
510

Excluded due to anti-dilutive effect
11

 
11

 
11

 
10

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
(0.76
)
 
$
(1.36
)
 
$
(1.34
)
 
$
(3.39
)
Diluted
$
(0.76
)
 
$
(1.36
)
 
$
(1.34
)
 
$
(3.39
)