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Accumulated Other Comprehensive Loss Attributable to Crown Holdings (Schedule of AOCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in AOCI [Roll Forward]    
Balance at beginning of period $ 2,092 $ 1,286
Other comprehensive (loss) / income before reclassifications (199) 137
Amounts reclassified from accumulated other comprehensive income 137 106
Other comprehensive income (62) 243
Balance at end of period 2,604 2,092
Defined benefit plans    
Increase (Decrease) in AOCI [Roll Forward]    
Balance at beginning of period (1,449) (1,533)
Other comprehensive (loss) / income before reclassifications (117) 10
Amounts reclassified from accumulated other comprehensive income 102 74
Other comprehensive income (15) 84
Balance at end of period (1,464) (1,449)
Foreign currency translation    
Increase (Decrease) in AOCI [Roll Forward]    
Balance at beginning of period (1,668) (1,817)
Other comprehensive (loss) / income before reclassifications (91) 149
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income (91) 149
Balance at end of period (1,759) (1,668)
Gains and losses on cash flow hedges    
Increase (Decrease) in AOCI [Roll Forward]    
Balance at beginning of period (14) (24)
Other comprehensive (loss) / income before reclassifications 9 (22)
Amounts reclassified from accumulated other comprehensive income 35 32
Other comprehensive income 44 10
Balance at end of period 30 (14)
Accumulated Other Comprehensive Loss    
Increase (Decrease) in AOCI [Roll Forward]    
Balance at beginning of period (3,131) (3,374)
Balance at end of period $ (3,193) $ (3,131)