Asbestos-Related Liabilities (Summary of Claims Activity) (Details) - Claim	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss Contingency, Pending Claims [Roll Forward]
Beginning claims	56,000	56,000	55,500
New claims	1,500	2,000	2,000
Settlements or dismissals	(1,500)	(2,000)	(1,500)
Ending claims	56,000	56,000	56,000

Loss Contingency, Pending Claims [Roll Forward]

No definition available.

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Namespace Prefix:	cck_
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- Definition

The number of claims settled and dismissed during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

+ Details

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- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

+ Details

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

+ Details

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