Allowance for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Analysis of ending balance of finance receivables and net investment in operating leases
Finance receivables, net	$ 72,004		$ 72,004		$ 71,510
Net Investment In Operating Leases	19,851		19,851		16,451
Financial Services [Member]
Allowance for credit losses
Beginning balance	369	452	389	501
Beginning balance (Net Investment In Operating Leases)	22	33	23	40
Beginning balance (Total)	391	485	412	541
Charge-offs	(70)	(70)	(151)	(159)
Charge-offs (Net Investment In Operating Leases)	(15)	(11)	(30)	(24)
Charge-offs (Total Allowance)	(85)	(81)	(181)	(183)
Recoveries	40	49	80	101
Recoveries (Net Investment In Operating Leases)	13	14	24	28
Recoveries (Total Allowance)	53	63	104	129
Provision for credit losses	16	(42)	42	(58)
Provision for Credit Losses (Net Investment In Operating Leases)	4	(9)	7	(17)
Provision for credit losses (Total Allowance)	20	(51)	49	(75)
Other		(5)	(5)	(1)
Other (Net Investment In Operating Leases)	(1)	(1)	(1)	(1)
Other (Total Allowance)	(1)	(6)	(6)	(2)
Ending balance	355	384	355	384
Ending balance (Net Investment In Operating Leases)	23	26	23	26
Ending balance (Total)	378	410	378	410
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	329	366	329	366
Collective impairment allowance (Net Investment in Operating Leases)	23	26	23	26
Collective impairment allowance (Total Allowance)	352	392	352	392
Specific impairment allowance	26	18	26	18
Specific impairment allowance (Net Investment in Operating Leases)
Specific impairment allowance (Total Allowance)	26	18	26	18
Ending balance	355	384	355	384
Ending balance (Net Investment In Operating Leases)	23	26	23	26
Ending balance (Total)	378	410	378	410
Analysis of ending balance of finance receivables and net investment in operating leases
Collectively evaluated for impairment	76,452	72,228	76,452	72,228
Collectively evaluated for impairment (Net Investment in Operating Leases)	17,917	13,321	17,917	13,321
Specifically evaluated for impairment	487	479	487	479
Specifically evaluated for impairment (Net Investment in Operating Leases)
Financing Receivable, Gross	76,939	72,707	76,939	72,707	76,159
Recorded investment (Net Investment in Operating Leases)	17,917	13,321	17,917	13,321
Finance receivables, net	76,584	72,323	76,584	72,323	75,770
Net Investment In Operating Leases	17,894	13,295	17,894	13,295	15,036
Financial Services [Member] | Consumer [Member]
Allowance for credit losses
Beginning balance	342	424	360	457
Charge-offs	(61)	(67)	(141)	(152)
Recoveries	38	47	77	94
Provision for credit losses	5	(34)	33	(32)
Other		(5)	(5)	(2)
Ending balance	324	365	324	365
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	302	348	302	348
Specific impairment allowance	22	17	22	17
Ending balance	324	365	324	365
Analysis of ending balance of finance receivables and net investment in operating leases
Collectively evaluated for impairment	47,408	46,884	47,408	46,884
Specifically evaluated for impairment	420	398	420	398
Financing Receivable, Gross	47,828	47,282	47,828	47,282
Finance receivables, net	47,504	46,917	47,504	46,917
Financial Services [Member] | Non-consumer [Member]
Allowance for credit losses
Beginning balance	27	28	29	44
Charge-offs	(9)	(3)	(10)	(7)
Recoveries	2	2	3	7
Provision for credit losses	11	(8)	9	(26)
Other				1
Ending balance	31	19	31	19
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	27	18	27	18
Specific impairment allowance	4	1	4	1
Ending balance	31	19	31	19
Analysis of ending balance of finance receivables and net investment in operating leases
Collectively evaluated for impairment	29,044	25,344	29,044	25,344
Specifically evaluated for impairment	67	81	67	81
Financing Receivable, Gross	29,111	25,425	29,111	25,425
Finance receivables, net	$ 29,080	$ 25,406	$ 29,080	$ 25,406