Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to Crown Holdings	$ 90	$ 107
Weighted average shares outstanding:
Basic (in shares)	133.5	138.5
Add: dilutive stock options and restricted stock (in shares)	0.3	0.5
Diluted (in shares)	133.8	139.0
Basic earnings per share (in usd per share)	$ 0.67	$ 0.77
Diluted earnings per share (in usd per share)	$ 0.67	$ 0.77
Value of shares excluded from the computation of diluted earnings per share	0.2