Fair Value Measurements (Details) (Recurring [Member], USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Assets measured at fair value
Total assets	$ 234	$ 178
Liabilities measured at fair value
Total liabilities	1,017	46
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member]
Assets measured at fair value
Derivatives	46	27
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Derivatives	46	27
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Derivatives	0	0
Other Current Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Derivatives	0	0
Other Current Assets [Member] | Commodity Derivatives [Member]
Assets measured at fair value
Derivatives		14
Other Current Assets [Member] | Commodity Derivatives [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Derivatives		0
Other Current Assets [Member] | Commodity Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Derivatives		14
Other Current Assets [Member] | Commodity Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Derivatives		0
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member]
Assets measured at fair value
Derivatives	27	2
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Derivatives	27	2
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Derivatives	0	0
Other Noncurrent Assets [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Derivatives	0	0
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Assets measured at fair value
Derivatives	15
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Derivatives	0
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Derivatives	15
Other Noncurrent Assets [Member] | Interest Rate Swaps [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Derivatives	0
Other Noncurrent Assets [Member] | Equity Swap [Member]
Assets measured at fair value
Derivatives	112	104
Other Noncurrent Assets [Member] | Equity Swap [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Derivatives	112	104
Other Noncurrent Assets [Member] | Equity Swap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Derivatives	0	0
Other Noncurrent Assets [Member] | Equity Swap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Derivatives	0	0
Other Noncurrent Assets [Member]
Assets measured at fair value
Investments in marketable common stock	34	31
Other Noncurrent Assets [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Investments in marketable common stock	34	31
Other Noncurrent Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Investments in marketable common stock	0	0
Other Noncurrent Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Investments in marketable common stock	0	0
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member]
Liabilities measured at fair value
Derivatives	70	27
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Liabilities measured at fair value
Derivatives	70	27
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities measured at fair value
Derivatives	0	0
Other Current Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Derivatives	0	0
Other Current Liabilities [Member] | Cross-Currency Interest Rate Swaps [Member]
Liabilities measured at fair value
Derivatives	20	17
Other Current Liabilities [Member] | Cross-Currency Interest Rate Swaps [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Liabilities measured at fair value
Derivatives	0	0
Other Current Liabilities [Member] | Cross-Currency Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities measured at fair value
Derivatives	20	17
Other Current Liabilities [Member] | Cross-Currency Interest Rate Swaps [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Derivatives	0	0
Other Current Liabilities [Member] | Commodity Derivatives [Member]
Liabilities measured at fair value
Derivatives	32
Other Current Liabilities [Member] | Commodity Derivatives [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Liabilities measured at fair value
Derivatives	0
Other Current Liabilities [Member] | Commodity Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities measured at fair value
Derivatives	32
Other Current Liabilities [Member] | Commodity Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Derivatives	0
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member]
Liabilities measured at fair value
Derivatives	865
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Liabilities measured at fair value
Derivatives	0
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities measured at fair value
Derivatives	865
Long-Term Debt [Member] | Fixed Rate Debt Swapped To Floating [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Derivatives	0
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member]
Liabilities measured at fair value
Derivatives	30	2
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Liabilities measured at fair value
Derivatives	30	2
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities measured at fair value
Derivatives	0	0
Other Noncurrent Liabilities [Member] | Foreign Currency Exchange Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Derivatives	0	0
Quoted Prices in Active Markets (Level 1) [Member]
Assets measured at fair value
Total assets	219	164
Liabilities measured at fair value
Total liabilities	100	29
Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value
Total assets	15	14
Liabilities measured at fair value
Total liabilities	917	17
Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value
Total assets	0	0
Liabilities measured at fair value
Total liabilities	$ 0	$ 0