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Related Party Transactions - Narrative (Details)					3 Months Ended			12 Months Ended
	May 26, 2020 USD ($) $ / shares	Mar. 09, 2020 USD ($) $ / shares	Feb. 04, 2020 USD ($)	Jul. 31, 2018	Dec. 31, 2020 sponsor $ / shares	Sep. 30, 2020 $ / shares	Jun. 30, 2020 $ / shares	Dec. 31, 2020 USD ($) sponsor $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($)
Related Party Transaction [Line Items]
Investment in certain marketable securities								$ 140,000,000	$ 0	$ 0
Dividends declared per share (in dollars per share) | $ / shares					$ 0	$ 0	$ 0	$ 1.20	$ 3.05	$ 2.50
Dividends paid (in dollars per share) | $ / shares	$ 0.40	$ 0.80						$ 1.20	$ 3.05	$ 2.50
Dividends paid	$ 40,000,000	$ 80,000,000						$ 121,000,000	$ 306,000,000	$ 238,000,000
Minimum ownership interest in CVR Energy for eligibility to file as member of AEPC consolidated federal income tax group					80.00%			80.00%
Number of sponsors of pension plans | sponsor					2			2
Affiliate Pension Obligations
Related Party Transaction [Line Items]
Aggregate underfunded pension obligation if pension plans voluntarily terminated by affiliate											$ 435,000,000
IEP
Related Party Transaction [Line Items]
Dividends paid	$ 28,000,000	$ 57,000,000						$ 85,000,000	$ 218,000,000	179,000,000
Ownership percentage held by controlling stockholder								71.00%	71.00%
CVR Partners
Related Party Transaction [Line Items]
Distributions declared (in dollars per share) | $ / shares					$ 0			$ 0
Distributions paid (in dollars per share) | $ / shares								$ 0	$ 4.00
Distributions paid									$ 45,000,000	0
CVR Partners | CVR Energy
Related Party Transaction [Line Items]
Distributions paid									16,000,000
IEP Energy LLC | IEP
Related Party Transaction [Line Items]
Ownership percentage held by controlling stockholder				82.00%
Joint Venture Agreement | CVR Refining | Enable JV
Related Party Transaction [Line Items]
Initial term of agreement								20 years
Crude Oil Transportation Services | CRRM | Midway JV
Related Party Transaction [Line Items]
Costs incurred								$ 17,000,000	$ 21,000,000	$ 18,000,000
Agency Agreement with IEP | IEH
Related Party Transaction [Line Items]
Investment in certain marketable securities			$ 140,000,000

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