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Receivables (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Expenses related to securitization and factoring facilities	$ 19	$ 23	$ 21

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- Definition

Interest Expense Securitization and Factoring Facilities.

+ References

No definition available.

+ Details

Name:	cck_InterestExpenseSecuritizationAndFactoringFacilities
Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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