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Commitments and Contingencies - Additional Information (Detail)
BRL in Millions, ₨ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
BRL
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
INR (₨)
Loss Contingencies [Line Items]            
Income due to reversal of accrued liability under tax indemnity       $ 58,000,000    
Contingency provision accruals $ 212,000,000 BRL 667        
Indian Department of Central Excise Authority | Cadbury            
Loss Contingencies [Line Items]            
Amount for formal claim of notice presented for unpaid excise tax, as of the balance sheet date 57,000,000   $ 57,000,000   $ 57,000,000 ₨ 3.7
Indian Department of Central Excise Authority | Cadbury | Show case notice            
Loss Contingencies [Line Items]            
Amount for formal claim of notice presented for unpaid excise tax, as of the balance sheet date 75,000,000   75,000,000   75,000,000 4.9
Indian Department of Central Excise Authority | Cadbury | Maximum            
Loss Contingencies [Line Items]            
Tax penalties and interest expense 90,000,000   90,000,000   $ 90,000,000 ₨ 5.8
Selling, general and administrative expenses            
Loss Contingencies [Line Items]            
Income due to reversal of accrued liability under tax indemnity       46,000,000    
Contingency provision accruals 153,000,000          
Interest and other expense, net            
Loss Contingencies [Line Items]            
Income due to reversal of accrued liability under tax indemnity       $ 12,000,000    
Contingency provision accruals $ 59,000,000          
Selling, general and administrative expenses and interest and other expense, net            
Loss Contingencies [Line Items]            
Income due to reversal of accrued liability under tax indemnity     $ 3,000,000      
U.S. Commodity Futures Trading Commission ("CFTC")            
Loss Contingencies [Line Items]            
Loss contingency, filling date         April 1, 2015  
Loss contingency, damages sought         $ 1,000,000  
U.S. Commodity Futures Trading Commission ("CFTC") | Each Additional Violation of the Commodity Exchange Act            
Loss Contingencies [Line Items]            
Loss contingency, damages sought         $ 140,000