Indebtedness and Leases Future Minimum Lease Payments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Minimum Lease Payments [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 324
Operating Leases, Future Minimum Payments, Due in Two Years	1,214
Operating Leases, Future Minimum Payments, Due in Three Years	1,140
Operating Leases, Future Minimum Payments, Due in Four Years	1,054
Operating Leases, Future Minimum Payments, Due in Five Years	999
Operating Leases, Future Minimum Payments, Due Thereafter	6,251
Operating Leases, Future Minimum Payments Due	$ 10,982