Allowance for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Analysis of ending balance of finance receivables and net investment in operating leases
Finance receivables, net	$ 81,111	$ 77,481
Allowance For Credit Losses Policy [Abstract]
Term When Finance Receivables Are Considered Impaired	120 days
Term to Charge Off Finance Receivables	120 days
Financial Services [Member]
Allowance for credit losses
Beginning balance	357	389
Charge-offs	(300)	(304)
Recoveries	140	149
Provision for credit losses	133	(124)
Other	(9)	(1)
Ending balance	321	357
Ending balance (including reserves for operating leases)	359	380
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	298	332
Specific impairment allowance	23	25
Ending balance	321	357
Ending balance (including reserves for operating leases)	359	380
Analysis of ending balance of finance receivables and net investment in operating leases
Collectively evaluated for impairment	85,942	80,667
Specifically evaluated for impairment	520	506
Financing Receivable, Gross	86,462	81,173
Finance receivables, net	86,141	80,816
Allowance For Credit Losses Policy [Abstract]
Number Of Days At Which Finance Receivables Impaired	when an account is deemed to be uncollectible or when an account is 120 days delinquent
Financial Services [Member] | Consumer [Member]
Allowance for credit losses
Beginning balance	327	360
Charge-offs	(294)	(289)
Recoveries	131	144
Provision for credit losses	150	(112)
Other	(9)	0
Ending balance	305	327
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	282	304
Specific impairment allowance	23	23
Ending balance	305	327
Analysis of ending balance of finance receivables and net investment in operating leases
Collectively evaluated for impairment	53,681	49,762
Specifically evaluated for impairment	415	435
Financing Receivable, Gross	54,096	50,197
Finance receivables, net	53,791	49,870
Allowance For Credit Losses Policy [Abstract]
Number Of Days At Which Finance Receivables Are Charged Off	greater than 120 days past due
Financial Services [Member] | Non-consumer [Member]
Allowance for credit losses
Beginning balance	30	29
Charge-offs	(6)	(15)
Recoveries	9	5
Provision for credit losses	(17)	(12)
Other	0	(1)
Ending balance	16	30
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	16	28
Specific impairment allowance	0	2
Ending balance	16	30
Analysis of ending balance of finance receivables and net investment in operating leases
Collectively evaluated for impairment	32,261	30,905
Specifically evaluated for impairment	105	71
Financing Receivable, Gross	32,366	30,976
Finance receivables, net	$ 32,350	$ 30,946