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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Common Stock Rollforward
The following summarizes the changes in the Company’s outstanding shares of common stock:
millions
2017
 
2016
 
2015
Shares of common stock issued
 
 
 
 
 
Shares at January 1
572

 
528

 
526

Exercise of stock options
—

 
1

 
1

Issuance of common stock
—

 
41

 
—

Issuance of restricted stock
2

 
2

 
1

Shares at December 31
574

 
572

 
528

Shares of common stock held in treasury
 
 
 
 
 
Shares at January 1
21

 
20

 
19

Purchase of treasury stock
22

 
—

 
—

Shares received for restricted stock vested and stock options exercised
—

 
1

 
1

Shares at December 31
43

 
21

 
20

Shares of common stock outstanding at December 31
531

 
551

 
508
Earnings Per Share Table
The following provides a reconciliation between basic and diluted EPS attributable to common stockholders for the years ended December 31:
millions except per-share amounts
2017
 
2016
 
2015
Net income (loss)
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
(456
)
 
$
(3,071
)
 
$
(6,692
)
Income (loss) effect of TEUs
(7
)
 
(6
)
 
—

Less distributions on participating securities
1

 
1

 
3

Basic
$
(464
)
 
$
(3,078
)
 
$
(6,695
)
Income (loss) effect of TEUs
(2
)
 
(1
)
 
—

Diluted
$
(466
)
 
$
(3,079
)
 
$
(6,695
)
Shares
 
 
 
 
 
Average number of common shares outstanding—basic
548

 
522

 
508

Average number of common shares outstanding—diluted
548

 
522

 
508

Excluded due to anti-dilutive effect
11

 
11

 
11

Net income (loss) per common share
 
 
 
 
 
Basic
$
(0.85
)
 
$
(5.90
)
 
$
(13.18
)
Diluted
$
(0.85
)
 
$
(5.90
)
 
$
(13.18
)