Derivative Instruments and Hedging Activities (Details 2) (USD $) In Millions	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ (27)	$ 20
Amount of Gain (Loss) Recognized in CTA on Outstanding Derivatives (Effective Portion)	(12)	(10)
Amount of Gain (Loss) Recognized in Income on Derivative	(15)	49
Foreign Currency Exchange Derivatives [Member] \| Cost of Sales [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	5	219
Foreign Currency Exchange Derivatives [Member] \| Cost of Sales [Member] \| Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3	(3)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Foreign Currency Exchange Derivatives [Member] \| Net Financing Charges [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	3	(185)
Foreign Currency Exchange Derivatives [Member] \| Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(16)	0
Commodity Derivatives [Member] \| Cost of Sales [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	0	1
Commodity Derivatives [Member] \| Cost of Sales [Member] \| Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	28	(1)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Commodity Derivatives [Member] \| Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(20)	10
Forward Treasury Locks [Member] \| Net Financing Charges [Member] \| Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1	2
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Forward Treasury Locks [Member] \| Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	9	10
Interest Rate Swaps [Member] \| Net Financing Charges [Member] \| Fair Value Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	15	10
Equity Swap [Member] \| Selling, General And Administrative Expenses [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	(23)	14
Fixed Rate Debt Swapped To Floating [Member] \| Net Financing Charges [Member] \| Fair Value Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	(15)	(7)
Cash Flow Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(27)	20
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	32	(2)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Fair Value Hedging [Member]
Location and amount of gains and losses on derivative instruments and related hedge items
Amount of Gain (Loss) Recognized in Income on Derivative	$ 0	$ 3

Location and amount of gains and losses on derivative instruments and related hedge items.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Cumulative adjustment resulting from gains and losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, commencing as of the designation date. Adjustment reported in equity as part of accumulated other comprehensive income.

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