Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income attributable to Crown Holdings	$ 214	$ 183	$ 428	$ 423
Weighted average shares outstanding:
Basic (in shares)	133.3	133.9	133.6	133.9
Add: dilutive stock options and restricted stock (in shares)	1.1	1.1	0.9	0.9
Diluted (in shares)	134.4	135.0	134.5	134.8
Basic earnings per share (in usd per share)	$ 1.61	$ 1.37	$ 3.20	$ 3.16
Diluted earnings per share (in usd per share)	$ 1.59	$ 1.36	$ 3.18	$ 3.14
Value of shares excluded from the computation of diluted earnings per share		0.2	0.7	0.6