Leases - Lessor Arrangements (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Net investment in sales-type and direct financing leases	$ 22,000	$ 22,000
Net investment in sales-type and direct financing leases, lease receivables	19,458	19,458
Net investment in sales-type and direct financing leases, unguaranteed residuals	2,500	2,500
Unguaranteed residual asset with third-party residual value insurance	5,700	5,700
Lease income	425	1,300
Sales-type and direct financing leases, income	198	601
Operating lease, income	$ 227	$ 663