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Depreciation And Amortization
6 Months Ended
Jun. 30, 2012
Depreciation, Depletion and Amortization [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
 Depreciation and Amortization
Accumulated depreciation of owned equipment and property at June 30, 2012 and December 31, 2011 was $10.3 billion and $10.1 billion, respectively. Accumulated amortization of equipment and property under capital leases at June 30, 2012 and December 31, 2011 was $197 million and $448 million, respectively.