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Accumulated Other Comprehensive Loss Attributable to Crown Holdings (Schedule of AOCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period $ 1,286 $ 923  
Other comprehensive income / (loss) before reclassifications 137 (191)  
Amounts reclassified from accumulated other comprehensive income 106 55  
Other comprehensive income / (loss) 243 (133)  
Balance at end of period 2,092 1,286  
Defined benefit plans      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (1,533) (1,583)  
Other comprehensive income / (loss) before reclassifications 10 (20)  
Amounts reclassified from accumulated other comprehensive income 74 70  
Other comprehensive income / (loss) 84 50  
Balance at end of period (1,449) (1,533)  
Foreign currency translation      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (1,817) (1,681)  
Other comprehensive income / (loss) before reclassifications 149 (136)  
Amounts reclassified from accumulated other comprehensive income 0 0  
Other comprehensive income / (loss) 149 (136)  
Balance at end of period (1,668) (1,817)  
Gains and losses on cash flow hedges      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (24) 23  
Cumulative effect of change in accounting principle     $ 3
Other comprehensive income / (loss) before reclassifications (22) (35)  
Amounts reclassified from accumulated other comprehensive income 32 (15)  
Other comprehensive income / (loss) 10 (47)  
Balance at end of period (14) (24)  
Accumulated Other Comprehensive Loss      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (3,374) (3,241)  
Cumulative effect of change in accounting principle     $ 3
Balance at end of period $ (3,131) $ (3,374)