Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Term To Charge Off Finance Receivables									greater than 120 days past due
Number Of Days At Which Finance Receivables Impaired									when an account is deemed to be uncollectible or when an account is 120 days delinquent
Allowance for credit losses, finance receivables
Beginning balance				$ 321				$ 357	$ 321	$ 357
Charge-offs									(336)	(300)
Recoveries									126	140
Provision for credit losses									274	133
Other									(12)	(9)
Ending balance	$ 373				$ 321				373	321	$ 357
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	350				298				350	298
Specific impairment allowance	23				23				23	23
Ending balance	373				321				373	321	357
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	96,687				86,711				96,687	86,711
Specifically evaluated for impairment	509				525				509	525
Financing Receivables	97,196				87,236				97,196	87,236
Allowance for credit losses, net investment in operating leases
Beginning balance				38				23	38	23
Charge-offs									(123)	(111)
Recoveries									62	62
Other									(1)	0
Ending balance	49				38				49	38	23
Analysis of ending balance of allowance for credit losses, net investment in operating leases
Collective impairment allowance	49				38				49	38
Specific impairment allowance	0				0				0	0
Ending balance	49				38				49	38	23
Analysis of ending balance of net investment in operating leases
Collectively evaluated for impairment	25,128				21,556				25,128	21,556
Individually evaluated for impairment	0				0				0	0
Net investment in operating leases before allowance for credit losses	25,128				21,556				25,128	21,556
Total allowance
Beginning balance				359				380	359	380
Charge-offs									(459)	(411)
Recoveries									188	202
Provision for credit losses	108	$ 100	$ 72	67	82	$ 57	$ 27	31	347	197	146
Other									(13)	(9)
Ending balance	422				359				422	359	380
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Collective impairment allowance	399				336				399	336
Specific impairment allowance	23				23				23	23
Ending balance	422				359				422	359	380
Ending balance, net of allowance for credit losses	96,823				86,915				96,823	86,915
Ending balance, net investment in operating leases	25,079				21,518				25,079	21,518
Net Investment in Operating Leases [Member]
Allowance for credit losses, finance receivables
Provision for credit losses									73	64
Consumer Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance				305				327	305	327
Charge-offs									(333)	(294)
Recoveries									120	131
Provision for credit losses									276	150
Other									(11)	(9)
Ending balance	357				305				357	305	327
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	338				282				338	282
Specific impairment allowance	19				23				19	23
Ending balance	357				305				357	305	327
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	59,574				53,681				59,574	53,681
Specifically evaluated for impairment	375				415				375	415
Financing Receivables	59,949				54,096				59,949	54,096
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Ending balance, net of allowance for credit losses	59,592				53,791				59,592	53,791
Non-Consumer Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance				$ 16				$ 30	16	30
Charge-offs									(3)	(6)
Recoveries									6	9
Provision for credit losses									(2)	(17)
Other									(1)	0
Ending balance	16				16				16	16	30
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance	12				16				12	16
Specific impairment allowance	4				0				4	0
Ending balance	16				16				16	16	$ 30
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	37,113				33,030				37,113	33,030
Specifically evaluated for impairment	134				110				134	110
Financing Receivables	37,247				33,140				37,247	33,140
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Ending balance, net of allowance for credit losses	$ 37,231				$ 33,124				$ 37,231	$ 33,124