Derivative Instruments and Hedging Activities (Details 1) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	$ 28	$ 19
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	18	8
Other Current Assets [Member] | Commodity Derivatives [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	0	14
Other Current Assets [Member] | Commodity Derivatives [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	0	0
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	11	1
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	16	1
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	15	0
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	0	0
Other Noncurrent Assets [Member] | Equity Swap [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	0	0
Other Noncurrent Assets [Member] | Equity Swap [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	112	104
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	49	19
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	21	8
Other Current Liabilities [Member] | Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	20	17
Other Current Liabilities [Member] | Cross-Currency Interest Rate Swaps [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	0	0
Other Current Liabilities [Member] | Commodity Derivatives [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	32	0
Other Current Liabilities [Member] | Commodity Derivatives [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	0	0
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	865	0
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	0	0
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	19	1
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities under ASC 815	11	1
Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	54	34
Derivatives Liabilities under ASC 815	985	37
Not Designated as Hedging Instruments [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets under ASC 815	146	113
Derivatives Liabilities under ASC 815	$ 32	$ 9