Leases (Details) (USD $) In Millions	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Future minimum capital and operating lessee payments and the related present value of capital lease payments
Capital Leases, 2012	$ 13
Capital Leases, 2013	11
Capital Leases, 2014	11
Capital Leases, 2015	9
Capital Leases, 2016	6
Capital Leases, After 2016	36
Capital Leases, Total minimum lease payments	86
Interest	(16)
Present value of net minimum lease payments	70
Operating Leases, 2012	289
Operating Leases, 2013	231
Operating Leases, 2014	170
Operating Leases, 2015	122
Operating Leases, 2016	80
Operating Leases, After 2016	100
Operating Leases, Total minimum lease payments	992
Leases (Textuals)
Leased capital assets included in net property, plant and equipment, primarily buildings and improvements	68	41
Total rental expense	$ 424	$ 389	$ 403

Leases.

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Future minimum capital and operating lessee payments and the related present value of capital lease payments.

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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The total of contractually required rental payments on leases meeting the criteria for capitalization.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within one year of the balance sheet date.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the fifth year from the balance sheet date.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the third year from the balance sheet date.

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Contractually required rental payments on leases meeting the criteria for capitalization, due within the second year from the balance sheet date.

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Contractually required rental payments due on leases meeting the criteria for capitalization, after the fifth year from the balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value calculated at the lesser of the interest rate implicit in the lease (if known) or the entity's incremental borrowing rate (as defined) at inception of the lease.

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The discounted value of future cash flows under leases meeting the criteria for capitalization.

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The total of future contractually required payments on leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating.

+ References

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This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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