Segment Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting [Abstract]
Intercompany profit eliminated	$ 1	$ 8	$ 5	$ 12

Inter Company Profit Related To Non Reportable Segments

No definition available.

Name:	cck_InterCompanyProfitRelatedToNonReportableSegments
Namespace Prefix:	cck_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration