Allowance for Credit Losses and Recorded Investment in Finance Receivables by Portfolio Segment (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended			3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2011 Retail Loan [Member]	Jun. 30, 2011 Commercial [Member]	Jun. 30, 2012 Finance Receivables, Net [Member]	Jun. 30, 2011 Finance Receivables, Net [Member]	Mar. 31, 2012 Finance Receivables, Net [Member]	Jun. 30, 2012 Finance Receivables, Net [Member] Retail Loan [Member]	Jun. 30, 2011 Finance Receivables, Net [Member] Retail Loan [Member]	Jun. 30, 2012 Finance Receivables, Net [Member] Commercial [Member]	Jun. 30, 2011 Finance Receivables, Net [Member] Commercial [Member]	Jun. 30, 2012 Finance Receivables, Net [Member] Dealer Products [Member]	Jun. 30, 2011 Finance Receivables, Net [Member] Dealer Products [Member]	Jun. 30, 2012 Investments In Operating Leases, Net [Member]	Mar. 31, 2012 Investments In Operating Leases, Net [Member]
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at	$ 606	$ 619	$ 667	$ 879			$ 524	$ 754		$ 395	$ 595	$ 10	$ 18	$ 119	$ 141	$ 91	$ 95
Charge-offs							(45)	(53)		(44)	(53)	(1)	0	0	0
Recoveries							18	45		18	44	0	1	0	0
Provisions							18	(218)		(13)	(206)	(3)	(6)	34	(6)
Allowance for credit losses at	606	619	667	879			515	528		356	380	6	13	153	135	91	95
Ending Balance: Individually Evaluated for Impairment							75	64		0	0	0	0	75	64
Ending Balance: Collectively Evaluated for Impairment							440	464		356	380	6	13	78	71
Gross Finance Receivables:
Ending Balance at	60,475	58,611					60,475	56,334	58,611	46,024	45,830	360	407	14,091	10,097
Ending Balance: Individually Evaluated for Impairment							258	191		0	0	0	0	258	191
Ending Balance: Collectively Evaluated for Impairment							60,217	56,143		46,024	45,830	360	407	13,833	9,906
Recorded Investment Aggregated And Evaluated					$ 573	$ 2