Leasing - Schedule of Depreciation Expense on Operating Lease Assets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease revenue									$ 1,355	$ 1,550	$ 1,596
Depreciation expense on operating lease assets (excluding remarketing gains)									868	1,051	1,084
Remarketing gains, net									(132)	(211)	(170)
Net depreciation expense on operating lease assets	$ 220	$ 169	$ 155	$ 192	$ 213	$ 206	$ 196	$ 225	736	840	914
Variable lease payments, excessive wear and tear									$ 21	$ 9	$ 7