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Commitments and Contingencies (Details) (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Line of Credit Facility [Line Items]
Aggregate principal amount	$ 2,000,000,000		$ 2,000,000,000
Reduction in principal amount	500,000,000		500,000,000
Credit Facilities (Amounts in paragraphs)
Maximum debt to capitalization ratio			65.00%
Debt Instrument, Covenant Compliance			We were in compliance with all material covenants on September 30, 2011.
Commitments and Contingencies (Amounts in Paragraphs)
Accrual for Environmental Remediation Costs	328,000,000		328,000,000
Environmental liabilities recorded in other current liabilities	120,000,000		120,000,000
Environmental liabilities recorded in other long-term liabilities	208,000,000		208,000,000
Low-end of the range of reasonably possible future costs for environmental remediation sites	300,000,000		300,000,000
High-end of the range of reasonably possible future costs for environmental remediation sites	729,000,000		729,000,000
Unused standby letters of credit	210,000,000		210,000,000
Bank guarantees	189,000,000		189,000,000
Surety bonds outstanding	141,000,000		141,000,000
Economic Development Revenue Bonds, outstanding	84,000,000		84,000,000
Operating leases
Rental expense for operating leases, excluding discontinued operations and net of immaterial amounts of sublease rental income	111,000,000	106,000,000	326,000,000	343,000,000
Terminated Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt issuance date			2007-08-10
Term of credit facility			5 years
Aggregate principal amount	2,000,000,000		2,000,000,000
First Credit Facility [Member]
Line of Credit Facility [Line Items]
Term of credit facility			5 years
Aggregate principal amount	1,500,000,000		1,500,000,000
Balance outstanding at the end of the period	0		0
Second Credit Facility [Member]
Line of Credit Facility [Line Items]
Term of credit facility			364 days
Aggregate principal amount	500,000,000		500,000,000
Balance outstanding at the end of the period	$ 0		$ 0