Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease revenue	$ 402	$ 403
Depreciation expense on operating lease assets (excluding remarketing gains)	273	267
Remarketing gains, net	(47)	(50)
Net depreciation expense on operating lease assets	226	217
Variable lease payments, excessive wear and tear	$ 2	$ 2