Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to Crown Holdings	$ 132	$ 128	$ 222	$ 235
Weighted average shares outstanding:
Basic (in shares)	133.6	135.3	133.5	136.9
Add: dilutive stock options and restricted stock (in shares)	0.2	0.4	0.3	0.5
Diluted (in shares)	133.8	135.7	133.8	137.4
Basic earnings per share (in usd per share)	$ 0.99	$ 0.95	$ 1.66	$ 1.72
Diluted earnings per share (in usd per share)	$ 0.99	$ 0.94	$ 1.66	$ 1.71
Value of shares excluded from the computation of diluted earnings per share	0.3	0.1	0.5	0.1