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Integration Program - Additional Information (Detail) (Cadbury Integration Program, USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Selling, general and administrative expenses
Jun. 30, 2013
Selling, general and administrative expenses
Jun. 30, 2014
Other Current Liabilities
Jun. 30, 2014
Other Long Term Liabilities
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          
Reversal of integration charges 3 5            
Charges incurred   (5)     52 73    
Restructuring reserve $ 88 $ 88 $ 145       $ 50 $ 38