Commitments and Contingencies (Unaudited) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended		60 Months Ended	61 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 04, 2013 364 Day [Member] Revolving Credit Facility [Member]	Sep. 04, 2012 364 Day [Member] Revolving Credit Facility [Member]	Sep. 08, 2016 5-Year Term Revolving Credit Facility [Member]	Aug. 31, 2018 5-Year Term Revolving Credit Facility [Member]	Sep. 30, 2013 5-Year Term Revolving Credit Facility [Member]	Aug. 31, 2013 5-Year Term Revolving Credit Facility [Member]	Sep. 08, 2011 5-Year Term Revolving Credit Facility [Member]	Sep. 30, 2013 Other Current Liabilities [Member]	Sep. 30, 2013 Other Noncurrent Liabilities [Member]	Sep. 30, 2013 Inventoried Costs [Member]	Sep. 30, 2013 Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 321,000,000		$ 321,000,000
High-end of the range of reasonably possible future costs for environmental remediation sites	812,000,000		812,000,000
Accrual for Environmental Remediation Costs	341,000,000		341,000,000									92,000,000	249,000,000	49,000,000	133,000,000
Financial Arrangements [Abstract]
Unused standby letters of credit	188,000,000		188,000,000
Bank guarantees	224,000,000		224,000,000
Surety bonds outstanding	165,000,000		165,000,000
Line of Credit Facility [Line Items]
Debt Instrument, Term					364 days		5 years	5 years
Line of Credit Facility, Maximum Borrowing Capacity						500,000,000				1,775,000,000	1,500,000,000
Line of Credit Facility, Covenant Terms								65.00%
Line of Credit Facility, Amount Outstanding									0
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	$ 75,000,000	$ 80,000,000	$ 223,000,000	$ 260,000,000