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	1,212
Operating leases, future minimum payments, due in three years	1,139
Operating leases, future minimum payments, due in four years	1,053
Operating leases, future minimum payments, due in five years	998
Operating leases, future minimum payments, due thereafter	6,250
Operating Leases, Future Minimum Payments Due	$ 10,976