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Equity (Tables)
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Schedule of Stockholders Equity [Table Text Block]
The activity in equity during the three months ended March 31, 2015 and 2014 is as follows (dollars in millions):
 
Common Stock
 
Accumulated
Other
Comprehensive
Loss
 
Retained
Earnings
 
 
 
 
Shares
 
Amount
 
 
Balances as of December 31, 2014
78,228,339

 
$
918

 
$
(7
)
 
$
1,000

Issuances of shares pursuant to equity-based plans
116,352

 
1

 
—

 
—

Stock-based compensation
—

 
(1
)
 
—

 
—

Dividends declared
—

 
—

 
—

 
(22
)
Net income
—

 
—

 
—

 
50

Balances as of March 31, 2015
78,344,691

 
$
918

 
$
(7
)
 
$
1,028

 
 
 
 
 
 
 
 
Balances as of December 31, 2013
78,085,559

 
$
911

 
$
(5
)
 
$
913

Issuances of shares pursuant to equity-based plans
96,497

 
—

 
—

 
—

Stock-based compensation
—

 
1

 
—

 
—

Dividends declared
—

 
—

 
—

 
(22
)
Net income
—

 
—

 
—

 
58

Balances as of March 31, 2014
78,182,056

 
$
912

 
$
(5
)
 
$
949