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Accumulated Other Comprehensive Loss Attributable to Crown Holdings - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable To Parent Net Of Tax [Roll Forward]        
Balance at beginning of period $ 3,172 $ 2,932 $ 3,228 $ 2,864
Total other comprehensive income / (loss) (35) 13    
Balance at end of period 3,172 2,932    
Total        
AOCI Attributable To Parent Net Of Tax [Roll Forward]        
Balance at beginning of period (1,497) (1,671) (1,462) (1,687)
Other comprehensive income / (loss) before reclassifications (37) 4    
Amounts reclassified from accumulated other comprehensive income 2 12    
Total other comprehensive income / (loss) (35) 16    
Balance at end of period (1,497) (1,671)    
Defined benefit plans        
AOCI Attributable To Parent Net Of Tax [Roll Forward]        
Balance at beginning of period (228) (654) (230) (664)
Other comprehensive income / (loss) before reclassifications 0 0    
Amounts reclassified from accumulated other comprehensive income 2 10    
Total other comprehensive income / (loss) 2 10    
Balance at end of period (228) (654)    
Foreign currency translation        
AOCI Attributable To Parent Net Of Tax [Roll Forward]        
Balance at beginning of period (1,271) (1,011) (1,236) (1,022)
Other comprehensive income / (loss) before reclassifications (35) 11    
Amounts reclassified from accumulated other comprehensive income 0 0    
Total other comprehensive income / (loss) (35) 11    
Balance at end of period (1,271) (1,011)    
Gains and losses on cash flow hedges        
AOCI Attributable To Parent Net Of Tax [Roll Forward]        
Balance at beginning of period 2 (6) $ 4 $ (1)
Other comprehensive income / (loss) before reclassifications (2) (7)    
Amounts reclassified from accumulated other comprehensive income 2    
Total other comprehensive income / (loss) (2) (5)    
Balance at end of period $ 2 $ (6)