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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Apr. 22, 2021
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]      
Net income attributable to Crown Holdings   $ 211 $ 88
Weighted average shares outstanding:      
Basic (in shares)   133.6 134.1
Add: dilutive stock options and restricted stock (in shares)   1.0 0.9
Diluted (in shares)   134.6 135.0
Basic earnings per share (in usd per share)   $ 1.58 $ 0.66
Diluted earnings per share (in usd per share)   1.57 $ 0.65
Value of shares excluded from the computation of diluted earnings per share     0.4
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Common Stock, Dividends, Per Share, Declared   $ 0.20  
Subsequent Event      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Common Stock, Dividends, Per Share, Declared $ 0.20