Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
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	(2,254,000,000)	(2,799,000,000)
Changes in accrual related to warranties issued during the period	1,885,000,000	2,215,000,000
Changes in accrual related to pre-existing warranties	49,000,000	690,000,000
Foreign currency translation and other	61,000,000	(46,000,000)
Product warranty reserve, ending balance	3,656,000,000	3,915,000,000
Affiliated Entity [Member]
Guarantees [Abstract]
Maximum potential payments	409,000,000	444,000,000
Carrying value of recorded liabilities related to guarantees	$ 17,000,000	$ 31,000,000