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Integration Program - Additional Information (Detail) (Cadbury Integration Program, USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Selling, general and administrative expenses
Mar. 31, 2014
Other Current Liabilities
Mar. 31, 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 2          
Charges incurred (2)     21    
Restructuring reserve $ 106 $ 145     $ 67 $ 39