Financial Services Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Term When Finance Receivables Are Considered Impaired	120 days
Term to Charge Off Finance Receivables	120 days
Allowance for credit losses
Beginning balance	$ 373	$ 321
Charge-offs	(443)	(336)
Recoveries	122	126
Provision for credit losses	438	274
Other	(6)	(12)
Ending balance	484	373
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	463	350
Specific impairment allowance	21	23
Ending balance	484	373
Collectively evaluated for impairment	96,200	90,555
Specifically evaluated for impairment	474	509
Financing Receivable, Gross	96,674	91,064
Finance receivables, net	96,190	90,691
Ending balance (including reserves for operating leases)	548	422
Consumer [Member]
Allowance for credit losses
Beginning balance	357	305
Charge-offs	(435)	(333)
Recoveries	116	120
Provision for credit losses	436	276
Other	(5)	(11)
Ending balance	469	357
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	450	338
Specific impairment allowance	19	19
Ending balance	469	357
Collectively evaluated for impairment	64,971	59,574
Specifically evaluated for impairment	367	375
Financing Receivable, Gross	65,338	59,949
Finance receivables, net	64,869	59,592
Non-consumer [Member]
Allowance for credit losses
Beginning balance	16	16
Charge-offs	(8)	(3)
Recoveries	6	6
Provision for credit losses	2	(2)
Other	(1)	(1)
Ending balance	15	16
Analysis of ending balance of allowance for credit losses
Collective impairment allowance	13	12
Specific impairment allowance	2	4
Ending balance	15	16
Collectively evaluated for impairment	31,229	30,981
Specifically evaluated for impairment	107	134
Financing Receivable, Gross	31,336	31,115
Finance receivables, net	$ 31,321	$ 31,099