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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
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
 
2018
 
2017
Net income (loss)
 
 
 
 
Net income (loss) attributable to common stockholders
 
$
121

 
$
(318
)
Income (loss) effect of TEUs
 
(3
)
 
(2
)
Less distributions on participating securities
 
1

 
—

Basic
 
$
117

 
$
(320
)
Income (loss) effect of TEUs
 
(1
)
 
—

Diluted
 
$
116

 
$
(320
)
Shares
 
 
 
 
Average number of common shares outstanding—basic
 
518

 
551

Dilutive effect of stock options
 
1

 
—

Average number of common shares outstanding—diluted
 
519

 
551

Excluded due to anti-dilutive effect
 
10

 
11

Net income (loss) per common share
 
 
 
 
Basic
 
$
0.23

 
$
(0.58
)
Diluted
 
$
0.22

 
$
(0.58
)