Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Operating lease revenue	$ 403	$ 370
Depreciation expense on operating lease assets	267	227
Remarketing gains, net	(50)	(64)
Net depreciation expense on operating lease assets	217	163
Variable lease payments, excessive wear and tear	$ 2	$ 5