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Asbestos-Related Liabilities - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 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 | $ 10 |
Inactive claims (in claims) | inactive_claim | 19,000 |
Accrued asbestos claims and related legal costs | $ 241 |
Unasserted claims | $ 191 |
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
Name: | cck_AccruedAsbestosClaimAndRelatedLegalCosts
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

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- 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: | dtr-types: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
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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
Name: | us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetPaymentForClaims
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration