Finance Receivables (Investment Of Wholesale Finance Receivables By Internal And External Credit Quality Indicator) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	$ 824,640	$ 813,997	$ 870,001	$ 1,164,236	$ 1,328,451
Wholesale [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	13,048	23,570
Wholesale [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	5,052	7,139
Wholesale [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	14,361	18,330
Wholesale [Member] | Medium Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	3,032	16,766
Wholesale [Member] | Low Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	789,147	748,192
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	5,087,490	5,377,161	4,091,893	740,721	714,429
Retail [Member] | Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	4,097,048	4,303,050
Retail [Member] | Sub-Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	$ 990,442	$ 1,074,111