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Leases - Build-to-suit Lease Obligation - Narrative (Details) - Discovery Hub [Member] $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2017 ft²
Lessee Lease Description [Line Items]
Build to suit lease area of land | ft²			312,000
Build to suit lease liability reclassified as financing obligation	$ 94	$ 95
Build to suit lease asset capitalized in property, plant and equipment	$ 92	$ 95

X

- Definition

Build to suit lease area of land.

+ References

No definition available.

+ Details

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Namespace Prefix:	cc_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Build to suit lease asset capitalized in property plant and equipment net.

+ References

No definition available.

+ Details

Name:	cc_BuildToSuitLeaseAssetCapitalizedInPropertyPlantAndEquipmentNet
Namespace Prefix:	cc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Build to suit lease liability reclassified as financing obligation.

+ References

No definition available.

+ Details

Name:	cc_BuildToSuitLeaseLiabilityReclassifiedAsFinancingObligation
Namespace Prefix:	cc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: