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Schedule of Liability Activity for Integration Programs (Detail) - Cadbury Integration Program - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Integration Program [Line Items]    
Balance at beginning of period $ 58 $ 145
Reversal of integration charges   (8)
Cash spent (15) (69)
Currency / other (7) (10)
Balance at end of period $ 36 $ 58