Leasing (Schedule of Property Subject to or Available for Operating Lease) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessor, Lease, Description [Line Items]
Lease customers enrolling in program	55,000
Percent of lease customers electing 120 day deferral	60.00%
Lease customers that paid contract in full and terminated lease and exited the program	2,900
Percent of lease customers current on loan and exited program	9400.00%
Customers opted into an extension requiring additional payments	8,500
Customers remaining in extension program requiring additional payments	4,500
Residual value guarantee	15.00%
Vehicles available for operating lease, gross	$ 11,015	$ 10,426
Lessor Operating Lease Accumulated Depreciation	(1,561)	(1,562)
Investment in operating leases, net	$ 9,454	8,864
Minimum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, lessee option to purchase underlying asset	24
Maximum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, lessee option to purchase underlying asset	60
Vehicles
Lessor, Lease, Description [Line Items]
Operating Lease, Residual Value of Leased Asset	$ 384	$ 352