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Asbestos-Related Liabilities - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) inactive_claim	Dec. 31, 2020
Liability for Asbestos and Environmental Claims [Abstract]
Holding period for insulation operations (in days)	90 days
Liability for asbestos and environmental claims net claims paid	$ 2
Inactive claims (in claims) | inactive_claim	19,000
Accrued asbestos claims and related legal costs	$ 249
Unasserted claims	$ 207
Percentage of claims that do not specify damages		81.00%

X

- Definition

The accrual for pending and future asbestos-related claims and related legal costs as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The accrual for Unasserted asbestos-related claims as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	cck_AccruedAsbestosUnassertedClaims
Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The number of inactive asbestos-related claims outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	cck_AsbestosRelatedClaimsInactiveNumber
Namespace Prefix:	cck_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of days following the stock acquisition of the insulation operations of a U.S. company before the company sold its insulation assets.

+ References

No definition available.

+ Details

Name:	cck_HoldingPeriodForInsulationOperations
Namespace Prefix:	cck_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of Claims Damages Not Specified

+ References

No definition available.

+ Details

Name:	cck_PercentageOfClaimsDamagesNotSpecified
Namespace Prefix:	cck_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process attributable to asbestos and environmental claims.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

+ Details

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Period Type:	duration