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Accumulated Other Comprehensive Loss Attributable to Crown Holdings (Schedule of AOCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period $ 668 $ 385 $ 337
Total other comprehensive income / (loss) 162 (246) (393)
Balance at end of period 923 668 385
Defined benefit plans      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (1,524) (1,690)  
Other comprehensive income / (loss) before reclassifications (92) 118  
Amounts reclassified from accumulated other comprehensive income 33 48  
Total other comprehensive income / (loss) (59) 166  
Balance at end of period (1,583) (1,524) (1,690)
Foreign currency translation      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (1,879) (1,446)  
Other comprehensive income / (loss) before reclassifications 198 (433)  
Amounts reclassified from accumulated other comprehensive income 0 0  
Total other comprehensive income / (loss) 198 (433)  
Balance at end of period (1,681) (1,879) (1,446)
Gains and losses on cash flow hedges      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period 3 (18)  
Other comprehensive income / (loss) before reclassifications 41 18  
Amounts reclassified from accumulated other comprehensive income (21) 3  
Total other comprehensive income / (loss) 20 21  
Balance at end of period 23 3 (18)
Accumulated Other Comprehensive Loss      
Increase (Decrease) in AOCI [Roll Forward]      
Balance at beginning of period (3,400) (3,154) (2,765)
Other comprehensive income / (loss) before reclassifications 147 (297)  
Amounts reclassified from accumulated other comprehensive income 12 51  
Total other comprehensive income / (loss) 159 (246) (389)
Balance at end of period $ (3,241) $ (3,400) $ (3,154)