Commitments and Contingencies (Details) ₨ in Billions	3 Months Ended
Mar. 31, 2019 USD ($) claim	Mar. 31, 2019 INR (₨) claim
U.S. Commodity Futures Trading Commission ("CFTC")
Loss Contingencies [Line Items]
Loss contingency, filing date	Apr. 01, 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
Cadbury \| Indian Department of Central Excise Authority
Loss Contingencies [Line Items]
Amount for formal claim of notice presented for unpaid excise tax, as of the balance sheet date	54,000,000	₨ 3.7
Cadbury \| Indian Department of Central Excise Authority \| Maximum
Loss Contingencies [Line Items]
Tax penalties and interest expense	84,000,000	5.8
Cadbury \| Indian Department of Central Excise Authority \| Show Cause Notice
Loss Contingencies [Line Items]
Amount for formal claim of notice presented for unpaid excise tax, as of the balance sheet date	$ 71,000,000	₨ 4.9
Number of show cause notices \| claim	5	5

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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