Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to Crown Holdings	$ 137	$ 132	$ 240	$ 222
Weighted average shares outstanding:
Basic (in shares)	133.9	133.6	133.8	133.5
Add: dilutive stock options and restricted stock (in shares)	0.9	0.2	0.8	0.3
Diluted (in shares)	134.8	133.8	134.6	133.8
Basic earnings per share (in usd per share)	$ 1.02	$ 0.99	$ 1.79	$ 1.66
Diluted earnings per share (in usd per share)	$ 1.02	$ 0.99	$ 1.78	$ 1.66
Value of shares excluded from the computation of diluted earnings per share	0.2	0.3	0.4	0.5