Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to Crown Holdings	$ 164	$ 177	$ 386	$ 412
Weighted average shares outstanding:
Basic (in shares)	133.7	134.0	133.6	135.9
Add: dilutive stock options and restricted stock (in shares)	0.1	0.4	0.2	0.5
Diluted (in shares)	133.8	134.4	133.8	136.4
Basic earnings per share (in usd per share)	$ 1.23	$ 1.32	$ 2.89	$ 3.03
Diluted earnings per share (in usd per share)	$ 1.23	$ 1.32	$ 2.88	$ 3.02
Value of shares excluded from the computation of diluted earnings per share	0.4		0.9