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Integration Program and Cost Savings Initiatives - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Vietnam | Selling, general and administrative expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost $ 9      
Morocco        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost   $ 4 $ 4  
Cost Savings Initiatives        
Restructuring Cost and Reserve [Line Items]        
Charges incurred     20  
Cadbury Integration Program        
Restructuring Cost and Reserve [Line Items]        
Expected cost savings to be recognized     750  
Annual cost savings achieved       $ 800
Restructuring and related cost, cost incurred     1,500  
Reversal of integration charges   8    
Restructuring reserve 36 58 145  
Cadbury Integration Program | Selling, general and administrative expenses        
Restructuring Cost and Reserve [Line Items]        
Charges incurred     216  
Cadbury Integration Program | Other current liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve 10      
Cadbury Integration Program | Other liabilities        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve 26      
Other Integration Costs | Vietnam        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost $ 9      
Other Integration Costs | Morocco        
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, expected cost   $ 4 $ 4