Net Investments in Operating Leases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Net Investment in Operating Leases, Length of Lease			60 months or less
Net investment in operating lease, term and payment extension			12 months
Vehicles, at cost	$ 33,632		$ 33,632			$ 33,593
Accumulated depreciation	5,894		5,894			6,144
Net Investment in operating leases	27,738		27,738			27,449
Allowance for credit losses	(513)	$ (587)	(513)	$ (587)	$ (513)	(589)	$ (600)	$ (597)
Provision for Loan and Lease Losses	(63)	(69)	(96)	(163)
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	894	986	1,818	2,039
Net Investment in Operating Leases [Member]
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding	$ 14,000		$ 14,000			16,300
Adjustments for New Accounting Pronouncement [Member]
Accumulated depreciation						78
Allowance for credit losses						$ (78)
Provision for Loan and Lease Losses		0		(48)
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease		$ 23		$ 48
Maximum [Member]
Net investment in operating lease, payment extension			6 months