Retirement Plans (Details 1) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Plan assets by asset category
Fair value of plan assets		$ 0	$ 0
U.S. Pension Plans [Member]
Plan assets by asset category
Fair value of plan assets	2,372	2,471	1,867
U.S. Pension Plans [Member] | Cash [Member]
Plan assets by asset category
Fair value of plan assets	25	52
U.S. Pension Plans [Member] | Cash [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	25	52
U.S. Pension Plans [Member] | Cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Cash [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Large-Cap [Member]
Plan assets by asset category
Fair value of plan assets	734	779
U.S. Pension Plans [Member] | Large-Cap [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	734	779
U.S. Pension Plans [Member] | Large-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Large-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Small-Cap [Member]
Plan assets by asset category
Fair value of plan assets	230	287
U.S. Pension Plans [Member] | Small-Cap [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	230	287
U.S. Pension Plans [Member] | Small-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Small-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | International - Developed [Member]
Plan assets by asset category
Fair value of plan assets	429	505
U.S. Pension Plans [Member] | International - Developed [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	429	505
U.S. Pension Plans [Member] | International - Developed [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | International - Developed [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Government [Member]
Plan assets by asset category
Fair value of plan assets	162	147
U.S. Pension Plans [Member] | Government [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	162	147
U.S. Pension Plans [Member] | Government [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Government [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Corporate/Other [Member]
Plan assets by asset category
Fair value of plan assets	494	469
U.S. Pension Plans [Member] | Corporate/Other [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	494	469
U.S. Pension Plans [Member] | Corporate/Other [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Corporate/Other [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Hedge Funds [Member]
Plan assets by asset category
Fair value of plan assets	94	91
U.S. Pension Plans [Member] | Hedge Funds [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Hedge Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Hedge Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	94	91	86
U.S. Pension Plans [Member] | Real Estate [Member]
Plan assets by asset category
Fair value of plan assets	204	141
U.S. Pension Plans [Member] | Real Estate [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	204	141	88
U.S. Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	2,074	2,239
U.S. Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
U.S. Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	298	232	174
Non-U.S. Pension Plans [Member]
Plan assets by asset category
Fair value of plan assets	1,471	1,216	1,080
Non-U.S. Pension Plans [Member] | Cash [Member]
Plan assets by asset category
Fair value of plan assets	57	28
Non-U.S. Pension Plans [Member] | Cash [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	57	28
Non-U.S. Pension Plans [Member] | Cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Cash [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Large-Cap [Member]
Plan assets by asset category
Fair value of plan assets	141	97
Non-U.S. Pension Plans [Member] | Large-Cap [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	141	97
Non-U.S. Pension Plans [Member] | Large-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Large-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | International - Developed [Member]
Plan assets by asset category
Fair value of plan assets	347	452
Non-U.S. Pension Plans [Member] | International - Developed [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	347	452
Non-U.S. Pension Plans [Member] | International - Developed [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | International - Developed [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | International - Emerging [Member]
Plan assets by asset category
Fair value of plan assets	47	13
Non-U.S. Pension Plans [Member] | International - Emerging [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	47	13
Non-U.S. Pension Plans [Member] | International - Emerging [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | International - Emerging [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Government [Member]
Plan assets by asset category
Fair value of plan assets	276	132
Non-U.S. Pension Plans [Member] | Government [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	276	132
Non-U.S. Pension Plans [Member] | Government [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Government [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Corporate/Other [Member]
Plan assets by asset category
Fair value of plan assets	499	412
Non-U.S. Pension Plans [Member] | Corporate/Other [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	499	412
Non-U.S. Pension Plans [Member] | Corporate/Other [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Corporate/Other [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Hedge Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Non-U.S. Pension Plans [Member] | Commodities [Member]
Plan assets by asset category
Fair value of plan assets	11	11
Non-U.S. Pension Plans [Member] | Commodities [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	11	11
Non-U.S. Pension Plans [Member] | Commodities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Commodities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Real Estate [Member]
Plan assets by asset category
Fair value of plan assets	93	71
Non-U.S. Pension Plans [Member] | Real Estate [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	93	71	64
Non-U.S. Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	1,378	1,145
Non-U.S. Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0	0
Non-U.S. Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	93	71	64
Postretirement Health and Other Benefits [Member]
Plan assets by asset category
Fair value of plan assets	156	0	0
Postretirement Health and Other Benefits [Member] | Large-Cap [Member]
Plan assets by asset category
Fair value of plan assets	25
Postretirement Health and Other Benefits [Member] | Large-Cap [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	25
Postretirement Health and Other Benefits [Member] | Large-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Large-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Small-Cap [Member]
Plan assets by asset category
Fair value of plan assets	8
Postretirement Health and Other Benefits [Member] | Small-Cap [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	8
Postretirement Health and Other Benefits [Member] | Small-Cap [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Small-Cap [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | International - Developed [Member]
Plan assets by asset category
Fair value of plan assets	19
Postretirement Health and Other Benefits [Member] | International - Developed [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	19
Postretirement Health and Other Benefits [Member] | International - Developed [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | International - Developed [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | International - Emerging [Member]
Plan assets by asset category
Fair value of plan assets	9
Postretirement Health and Other Benefits [Member] | International - Emerging [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	9
Postretirement Health and Other Benefits [Member] | International - Emerging [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | International - Emerging [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Government [Member]
Plan assets by asset category
Fair value of plan assets	19
Postretirement Health and Other Benefits [Member] | Government [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	19
Postretirement Health and Other Benefits [Member] | Government [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Government [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Corporate/Other [Member]
Plan assets by asset category
Fair value of plan assets	53
Postretirement Health and Other Benefits [Member] | Corporate/Other [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	53
Postretirement Health and Other Benefits [Member] | Corporate/Other [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Corporate/Other [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Commodities [Member]
Plan assets by asset category
Fair value of plan assets	14
Postretirement Health and Other Benefits [Member] | Commodities [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	14
Postretirement Health and Other Benefits [Member] | Commodities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Commodities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Real Estate [Member]
Plan assets by asset category
Fair value of plan assets	9
Postretirement Health and Other Benefits [Member] | Real Estate [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	9
Postretirement Health and Other Benefits [Member] | Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Plan assets by asset category
Fair value of plan assets	156
Postretirement Health and Other Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member]
Plan assets by asset category
Fair value of plan assets	0
Postretirement Health and Other Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member]
Plan assets by asset category
Fair value of plan assets	$ 0