Leasing Activity, Leasing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Line Items]
Interest income on lease financing	$ 224		$ 447
Variable revenues on lease financing	26		50
Fixed revenues on operating leases	357		730
Variable revenues on operating leases	14		32
Lease income	424	$ 443	867	$ 898
Total leasing revenue	648		1,314
Equipment leased to other party [Member]
Leases [Line Items]
Other lease-related revenues	$ 27		$ 55