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Integration Program and Cost Savings Initiatives - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]      
Charges incurred     $ 61
Cost Savings Initiatives
      
Restructuring Cost and Reserve [Line Items]      
Charges incurred 20 21 15
Other Integration Costs
      
Restructuring Cost and Reserve [Line Items]      
Charges incurred 4    
Cadbury Integration Program
      
Restructuring Cost and Reserve [Line Items]      
Expected cost savings to be recognized 750    
Annual costs savings 800    
Restructuring and related cost, expected cost 1,500    
Charges incurred 216 140 521
Cadbury Integration Program | Other Current Liabilities
      
Restructuring Cost and Reserve [Line Items]      
Charges incurred 101    
Cadbury Integration Program | Other Long Term Liabilities
      
Restructuring Cost and Reserve [Line Items]      
Charges incurred 44    
Cadbury Integration Program | Europe Segment
      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges, reversed   45  
Cadbury Integration Program | Gross
      
Restructuring Cost and Reserve [Line Items]      
Charges incurred   $ 185