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Depreciation And Amortization	9 Months Ended
Depreciation And Amortization	Sep. 30, 2013
Depreciation, Depletion and Amortization [Abstract]
Depreciation and Amortization	Depreciation and Amortization Accumulated depreciation of owned equipment and property at September 30, 2013 and December 31, 2012 was $10.8 billion and $10.6 billion, respectively. Accumulated amortization of equipment and property under capital leases at September 30, 2013 and December 31, 2012 was $242 million and $205 million, respectively.

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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