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Acquisition of Signode Pro Forma Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Pro forma net sales $ 3,046 $ 5,831
Pro forma net income attributable to Crown Holdings $ 176 $ 244