Derivative Instruments and Hedging Activities (Details 1) (USD $) In Millions	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010
Location and fair values of derivative instruments and hedging activities
Derivatives Assets Designated as Hedging Instruments under ASC 815	$ 32	$ 34	$ 26
Derivatives Assets Not Designated as Hedging Instruments under ASC 815	178	113	101
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	882	37	1,030
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	1	9	9
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets Designated as Hedging Instruments under ASC 815	8	19	14
Derivatives Assets Not Designated as Hedging Instruments under ASC 815	0	8	9
Other Current Assets [Member] | Commodity Derivatives [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets Designated as Hedging Instruments under ASC 815	8	14	2
Derivatives Assets Not Designated as Hedging Instruments under ASC 815	0	0	0
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets Designated as Hedging Instruments under ASC 815	1	1	1
Derivatives Assets Not Designated as Hedging Instruments under ASC 815	1	1	1
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets Designated as Hedging Instruments under ASC 815	15	0	9
Derivatives Assets Not Designated as Hedging Instruments under ASC 815	0	0	0
Other Noncurrent Assets [Member] | Equity Swap [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Assets Designated as Hedging Instruments under ASC 815	0	0	0
Derivatives Assets Not Designated as Hedging Instruments under ASC 815	177	104	91
Current Portion of Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	0	0	594
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	0	0	0
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	7	19	15
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	1	8	8
Other Current Liabilities [Member] | Commodity Derivatives [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	1	0	8
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	0	0	0
Other Current Liabilities [Member] | Net Investment Hedges [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	8	17	7
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	0	0	0
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	865	0	404
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	0	0	0
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member]
Location and fair values of derivative instruments and hedging activities
Derivatives Liabilities Designated as Hedging Instruments under ASC 815	1	1	2
Derivatives Liabilities Not Designated as Hedging Instruments under ASC 815	$ 0	$ 1	$ 1