Allowance for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Total allowance
Beginning balance	$ 406	$ 673	$ 534	$ 854
Charge-offs	(89)	(118)	(269)	(383)
Recoveries	54	73	182	234
Provision for credit losses	42	(20)	(33)	(109)
Other	3	(10)	2	2
Ending balance	416	598	416	598
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Collective impairment allowance	396	576	396	576
Specific impairment allowance	20	22	20	22
Ending balance	416	598	416	598
Allowance for credit losses, finance receivables
Beginning balance	380	609	494	767
Charge-offs	(78)	(98)	(234)	(308)
Recoveries	43	53	143	164
Provision for credit losses	43	(7)	(15)	(77)
Other	2	(10)	2	1
Ending balance	390	547	390	547
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	370	525	370	525
Specific impairment allowance	20	22	20	22
Ending balance	390	547	390	547
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	71,435	69,843	71,435	69,843
Specifically evaluated for impairment	472	420	472	420
Financing Receivables	71,907	70,263	71,907	70,263	72,401
Ending balance, net of allowance for credit losses	71,517	69,716	71,517	69,716	71,907
Allowance for credit losses, net investment in operating leases
Beginning balance	26	64	40	87
Charge-offs	(11)	(20)	(35)	(75)
Recoveries	11	20	39	70
Provision for credit losses	(1)	(13)	(18)	(32)
Other	1	0	0	1
Ending balance	26	51	26	51
Analysis of ending balance of allowance for credit losses, net investment in operating leases
Collective impairment allowance	26	51	26	51
Specific impairment allowance	0	0	0	0
Ending balance	26	51	26	51
Analysis of ending balance of net investment in operating leases
Collectively evaluated for impairment	13,975	10,455	13,975	10,455
Individually evaluated for impairment	0	0	0	0
Net investment in operating leases before allowance for credit losses	13,975	10,455	13,975	10,455	11,138
Ending balance, net investment in operating leases	13,949	10,404	13,949	10,404	11,098
Consumer Portfolio Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance	361	563	451	701
Charge-offs	(77)	(96)	(226)	(300)
Recoveries	40	51	133	160
Provision for credit losses	45	(3)	12	(55)
Other	3	(8)	2	1
Ending balance	372	507	372	507
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	354	494	354	494
Specific impairment allowance	18	13	18	13
Ending balance	372	507	372	507
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	46,259	45,747	46,259	45,747
Specifically evaluated for impairment	411	352	411	352
Financing Receivables	46,670	46,099	46,670	46,099
Ending balance, net of allowance for credit losses	46,298	45,592	46,298	45,592
Commercial Portfolio Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance	19	46	43	66
Charge-offs	(1)	(2)	(8)	(8)
Recoveries	3	2	10	4
Provision for credit losses	(2)	(4)	(27)	(22)
Other	(1)	(2)	0	0
Ending balance	18	40	18	40
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	16	31	16	31
Specific impairment allowance	2	9	2	9
Ending balance	18	40	18	40
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	25,176	24,096	25,176	24,096
Specifically evaluated for impairment	61	68	61	68
Financing Receivables	25,237	24,164	25,237	24,164
Ending balance, net of allowance for credit losses	$ 25,219	$ 24,124	$ 25,219	$ 24,124