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Lease Obligations (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
Capital Leases, Future Minimum Payments Due, Current $ 209
Capital Leases, Future Minimum Payments Due in Two Years 173
Capital Leases, Future Minimum Payments Due in Three Years 158
Capital Leases, Future Minimum Payments Due in Four Years 164
Capital Leases, Future Minimum Payments Due in Five Years 97
Capital Leases, Future Minimum Payments Due Thereafter 113
Capital Leases, Future Minimum Payments Due 914
Capital Leases, Future Minimum Payments, Interest Included in Payments (313)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments 601
Capital Leases Unamortized Discount Premium Net 2
Capital Lease Obligations, Current (120)
Capital Lease Obligations, Noncurrent $ 483