Debt Instruments - Floor Plan Facility (Details) - USD ($)				1 Months Ended
	Jul. 01, 2021	Mar. 01, 2021	Oct. 01, 2020	Nov. 30, 2019	Jun. 30, 2022	Feb. 01, 2022	Dec. 31, 2021	Dec. 01, 2021	Jun. 30, 2021
Line of Credit Facility [Line Items]
Line of credit, outstanding					$ 1,118,000,000		$ 2,053,000,000
Held in restricted cash					150,000,000		233,000,000		$ 109,000,000
Floor plan facility | Line of Credit
Line of Credit Facility [Line Items]
Outstanding balance, days held in inventory threshold				180 days
Outstanding balance, held in inventory, percentage of original principal amount due				10.00%
Outstanding balance, held in inventory, original principal amount, threshold				50.00%
Outstanding balance, held in inventory, wholesale value, threshold				50.00%
Deposit required under floor plan facility, percentage of principal balance				7.50%
Line of credit facility, maximum borrowing capacity	$ 1,750,000,000		$ 1,250,000,000		3,000,000,000	$ 3,000,000,000		$ 2,250,000,000
Line of credit, outstanding					1,100,000,000		1,900,000,000
Line of credit facility, remaining borrowing capacity					1,900,000,000		373,000,000
Held in restricted cash					$ 84,000,000		$ 141,000,000
Interest rate					3.31%		2.55%
Floor plan facility | Line of Credit | LIBOR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		2.65%	3.15%
Floor plan facility | Line of Credit | Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	(0.50%)