Commitments and Contingencies (Details) (Unaudited) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Commitments and Contingencies (Amounts in Paragraphs)
Accrual for Environmental Remediation Costs	$ 328		$ 328
Environmental liabilities recorded in other current liabilities	120		120
Environmental liabilities recorded in other long-term liabilities	208		208
Low-end of the range of reasonably possible future costs for environmental remediation sites	299		299
High-end of the range of reasonably possible future costs for environmental remediation sites	730		730
Unused standby letters of credit	152		152
Bank guarantees	197		197
Surety bonds outstanding	140		140
Economic Development Revenue Bonds, outstanding	84		84
Operating leases
Rental expense for operating leases, excluding discontinued operations and net of immaterial amounts of sublease rental income	$ 110	$ 118	$ 215	$ 236