Liabilities, Commitments And Contingencies (Schedule Of Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Accrued compensation and employee benefit costs	$ 5,769	$ 5,546
Environmental	710	758	721
Product warranties	1,572	1,046	1,076
Forward loss recognition	387	501
Other	4,557	4,388
Total	$ 12,995	$ 12,239