Acquisition of Signode Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net income attributable to Crown Holdings		$ 169	$ 389	$ 344
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic		$ 1.26	$ 2.91	$ 2.53
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted		$ 1.26	$ 2.91	$ 2.52
Pro forma net sales		$ 3,033	$ 9,005	$ 8,196