Commitments and Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Affiliated Entity [Member]	Dec. 31, 2011 Affiliated Entity [Member]
Guarantees [Abstract]
Maximum potential payments			$ 403,000,000	$ 444,000,000
Carrying value of recorded liabilities related to guarantees			25,000,000	31,000,000
Loss Contingency [Abstract]
Loss contingency estimate	2,300,000,000
Warranty [Abstract]
Product warranty reserve, beginning balance	3,915,000,000	3,855,000,000
Payments made during the period	(1,675,000,000)	(2,205,000,000)
Changes in accrual related to warranties issued during the period	1,402,000,000	1,575,000,000
Changes in accrual related to pre-existing warranties	(17,000,000)	426,000,000
Foreign currency translation and other	23,000,000	(26,000,000)
Product warranty reserve, ending balance	$ 3,648,000,000	$ 3,625,000,000