Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease revenue	$ 1,596	$ 1,550	$ 1,435
Depreciation expense on operating lease assets (excluding remarketing gains)	1,084	914	978
Remarketing gains, net	(170)	(344)	(127)
Net depreciation expense on operating lease assets	914	570	851
Variable lease payments, excessive wear and tear	$ 7	$ 16	$ 23