Finance Receivables (Aging Of Past Due Finance Receivables Including Non-Accrual Status Finance Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 5,912,130	$ 6,191,158	$ 4,961,894	$ 1,904,957	$ 2,042,880
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	5,087,490	5,377,161	4,091,893	740,721	714,429
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
Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,738,321	5,953,968
Current [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	4,915,711	5,144,910
Current [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	822,610	809,058
31-60 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	108,150	149,742
31-60 Days Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	107,373	147,564
31-60 Days Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	777	2,178
61-90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	37,281	51,484
61-90 Days Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	36,937	50,550
61-90 Days Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	344	934
Greater Than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	28,378	35,964
Greater Than 90 Days Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	27,469	34,137
Greater Than 90 Days Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	909	1,827
Total Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	173,809	237,190
Total Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	171,779	232,251
Total Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	$ 2,030	$ 4,939