Commitments and Contingencies (Unaudited) Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Site Contingency [Line Items]
High-end of the range of reasonably possible future costs for environmental remediation sites	$ 779		$ 779
Low-end of the range of reasonably possible future costs for environmental remediation sites	325		325
Accrual for Environmental Remediation Costs	347		347
Financial Arrangements [Abstract]
Unused standby letters of credit	203		203
Bank guarantees	251		251
Surety bonds outstanding	166		166
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	74	97	148	181
Inventoried Costs [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	62		62
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	122		122
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	249		249
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs	$ 98		$ 98