Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating lease revenue	$ 396	$ 384	$ 799	$ 754
Depreciation expense on operating lease assets	269	210	536	437
Remarketing gains, net	(50)	(128)	(100)	(192)
Net depreciation expense on operating lease assets	219	82	436	245
Variable lease payments, excessive wear and tear	$ 2	$ 5	$ 4	$ 10