Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies (Amounts in Paragraphs)
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 314
High-end of the range of reasonably possible future costs for environmental remediation sites	746
Amounts accrued for probable environmental remediation costs	342
Environmental liabilities recorded in other current liabilities	88
Environmental liabilities recorded in other long-term liabilities	254
Deferred in inventoried costs	57
Deferred in other non-current assets	147
Financial Arrangements (Amounts in Paragraph)
Unused standby letters of credit	193
Bank guarantees	295
Surety bonds outstanding	168
Operating leases (Table Amounts)
Rental expense for operating leases, excluding discontinued operations and net of immaterial amounts of sublease rental income	347	420	448
Minimum rental commitments due in 2013	274
Minimum rental commitments due in 2014	237
Minimum rental commitments due in 2015	198
Minimum rental commitments due in 2016	157
Minimum rental commitments due in 2017	76
Minimum rental commitments due thereafter	129
Total minimum lease payments	$ 1,071