Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 months	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items]
Gross unrealized gain	$ 700,000
Gross unrealized loss		200,000
Gross unrealized loss, net of tax	500,000	(100,000)
Marketable securities maturity period, minimum (in months)	12
Marketable securities maturity period, maximum (in months)	48
Allowance for doubtful accounts receivable	5,000,000	10,400,000
Repossessed inventory	14,500,000	26,500,000
Life of securitization trusts (in years)	4
Other inventories	215,200,000	153,400,000
Liability for safety recall campaigns	10,700,000	3,200,000	6,700,000
Deferred revenue related to extended service contracts	12,200,000	13,700,000
Research and development expenses	145,400,000	136,200,000	143,100,000
Advertising costs	82,300,000	75,800,000	80,200,000
Total share-based award compensation expense	38,192,000	30,431,000	17,576,000
Total share-based award compensation expense, net of taxes	24,000,000	19,200,000	11,000,000
Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	30
Useful lives of property, plant and equipment, maximum (in years)	40
Building Equipment And Land Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	7
Useful lives of property, plant and equipment, maximum (in years)	10
Machinery And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3
Useful lives of property, plant and equipment, maximum (in years)	10
Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of property, plant and equipment, minimum (in years)	3
Useful lives of property, plant and equipment, maximum (in years)	7
Financial Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Servicing fees, late fees and ancillary fees			$ 42,000,000