Non-controlling Interests - Narrative (Details) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Noncontrolling Interest [Line Items]
Conversion ratio						1.25
Decrease (increase) adjustments related to LLC units	$ 0	$ 0	$ 0	$ 0	$ 0
Carvana Group
Noncontrolling Interest [Line Items]
Ownership percentage by Carvana Co.	48.90%					48.90%
Ownership percentage by LLC Unitholders	51.10%					51.10%
Non-controlling Interests
Noncontrolling Interest [Line Items]
Decrease (increase) adjustments related to LLC units	$ 8	12	12	5	1	$ 32	$ 6
Non-controlling Interests | Follow-On Public Offering
Noncontrolling Interest [Line Items]
Decrease (increase) adjustments related to LLC units							(643)
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Decrease (increase) adjustments related to LLC units	$ (8)	$ (12)	$ (12)	$ (5)	$ (1)	$ (32)	(6)
Additional Paid-in Capital | Follow-On Public Offering
Noncontrolling Interest [Line Items]
Decrease (increase) adjustments related to LLC units							$ 643