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Financing Arrangements (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Summary of carrying values and coupon rates on financing arrangements
The carrying values and the fixed contractual coupon rates of the Company's financing arrangements are as follows (dollars in millions):
 
December 31, 2013
 
December 31, 2012

Current portion notes payable, 8.64%, due August 1, 2014
$
6,642

 
$
10,792

Current portion notes payable, 8.9012%, due August 1, 2014
2,467

 
4,043

Total current portion of notes payable
$
9,109

 
$
14,835

Long-term portion notes payable, 8.64%, due August 1, 2014
$
—

 
$
9,837

Long-term portion notes payable, 8.9012%, due August 1, 2014
—

 
3,606

Total long-term portion of notes payable
$
—

 
$
13,443
Schedule of principal payments on long-term debt obligations
Principal payments on long-term debt obligations subsequent to December 31, 2013 are as follows:
 
Year ending December 31,
Amount
2014
$
9,365