Finance Receivables (Allowance For Credit Losses And Finance Receivables By Portfolio, Individually And Collectively Evaluated For Impairment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance	$ 125,449	[1]	$ 173,589	$ 150,082	$ 40,068	$ 30,295
Finance receivables, total	5,912,130		6,191,158	4,961,894	1,904,957	2,042,880
Retail [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance	116,112	[1]	157,791
Finance receivables, ending balance	5,087,490		5,377,161	4,091,893	740,721	714,429
Wholesale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance	9,337	[1]	15,798
Finance receivables, ending balance	824,640		813,997	870,001	1,164,236	1,328,451
Individually Evaluated For Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance			3,566
Finance receivables, ending balance			5,423
Individually Evaluated For Impairment [Member] | Wholesale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance			3,566
Finance receivables, ending balance			5,423
Collectively Evaluated For Impairment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance	125,449		170,023
Finance receivables, ending balance	5,912,130		6,185,735
Collectively Evaluated For Impairment [Member] | Retail [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance	116,112		157,791
Finance receivables, ending balance	5,087,490		5,377,161
Collectively Evaluated For Impairment [Member] | Wholesale [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, ending balance	9,337		12,232
Finance receivables, ending balance	$ 824,640		$ 808,574

[1] Included in the $116.1 million retail allowance for credit losses on finance receivables is $66.0 million related to finance receivables held by VIEs.