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Commitments and Contingencies (Details)
₨ in Billions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
INR (₨)
Loss Contingencies [Line Items]        
Income due to reversal of accrued liability under tax indemnity   $ 58,000,000    
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     ₨ 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     4.9
Indian Department of Central Excise Authority | Cadbury | Maximum        
Loss Contingencies [Line Items]        
Tax penalties and interest expense $ 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    
Interest and other expense, net        
Loss Contingencies [Line Items]        
Income due to reversal of accrued liability under tax indemnity   $ 12,000,000    
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     $ 4,000,000  
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