Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Analysis of ending balance of finance receivables
Finance receivables, net	$ 85,208		$ 85,208		$ 81,111
Financial Services [Member]
Allowance for credit losses
Beginning balance	335	$ 327	321	$ 357
Charge-offs	(87)	(69)	(238)	(207)
Recoveries	30	35	94	109
Provision for credit losses	82	39	188	72
Other	(4)	(7)	(9)	(6)
Ending balance	356	325	356	325
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	335	302	335	302
Specific impairment allowance	21	23	21	23
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	91,820	84,326	91,820	84,326
Specifically evaluated for impairment	504	536	504	536
Financing Receivable, Gross	92,324	84,862	92,324	84,862	86,462
Finance receivables, net	91,968	84,537	91,968	84,537	$ 86,141
Financing And Loans And Leases Receivable Allowance	403	356	403	356
Financial Services [Member] | Consumer [Member]
Allowance for credit losses
Beginning balance	322	303	305	327
Charge-offs	(85)	(67)	(235)	(200)
Recoveries	29	33	90	101
Provision for credit losses	80	42	190	82
Other	(4)	(6)	(8)	(5)
Ending balance	342	305	342	305
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	323	283	323	283
Specific impairment allowance	19	22	19	22
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	58,749	53,150	58,749	53,150
Specifically evaluated for impairment	375	421	375	421
Financing Receivable, Gross	59,124	53,571	59,124	53,571
Finance receivables, net	58,782	53,266	58,782	53,266
Financial Services [Member] | Non-consumer [Member]
Allowance for credit losses
Beginning balance	13	24	16	30
Charge-offs	(2)	(2)	(3)	(7)
Recoveries	1	2	4	8
Provision for credit losses	2	(3)	(2)	(10)
Other	0	(1)	(1)	(1)
Ending balance	14	20	14	20
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	12	19	12	19
Specific impairment allowance	2	1	2	1
Analysis of ending balance of finance receivables
Collectively evaluated for impairment	33,071	31,176	33,071	31,176
Specifically evaluated for impairment	129	115	129	115
Financing Receivable, Gross	33,200	31,291	33,200	31,291
Finance receivables, net	$ 33,186	$ 31,271	$ 33,186	$ 31,271