Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Affiliated Entity [Member]	Dec. 31, 2011 Affiliated Entity [Member]
Guarantees [Abstract]
Maximum potential payments			$ 425,000,000	$ 444,000,000
Carrying value of recorded liabilities related to guarantees			29,000,000	31,000,000
Warranty [Abstract]
Product warranty reserve, beginning balance	3,915,000,000	3,855,000,000
Payments made during the period	(560,000,000)	(783,000,000)
Changes in accrual related to warranties issued during the period	526,000,000	500,000,000
Changes in accrual related to pre-existing warranties	26,000,000	132,000,000
Foreign currency translation and other	41,000,000	71,000,000
Product warranty reserve, ending balance	3,948,000,000	3,775,000,000
Loss Contingency [Abstract]
Loss contingency estimate	$ 1,500,000,000