Summary of Significant Accounting Policies - Schedule of Deferred Revenue Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Deferred revenue on automotive sales with and without resale value guarantee-- beginning of period	$ 1,926	$ 1,472
Additions	847	724
Net changes in liability for pre-existing contracts	(25)	56
Revenue recognized	(366)	(326)
Deferred revenue on automotive sales with and without resale value guarantee-end of period	$ 2,382	$ 1,926