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Commitments and Contingencies - Renewable Fuel Standards (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Petroleum Segment | EHS
Loss Contingencies [Line Items]
Expense of renewable identification numbers expense	$ 21	$ 50	$ 33	$ 27

X

- Definition

Represents the expense incurred for the purchase of Renewable Identification Numbers.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=cvi_EnvironmentalHealthAndSafetyMattersMember
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