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Financial Instruments - Summary of Activity in Cash Flow Hedging Reserve within Equity Related to all Derivative Instruments Classified as Cash Flow Hedges (Detail) (Parenthetical) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about hedges [abstract]    
Net (gain)/loss reclassified to consolidated statement of income on occurrence of hedged transactions under revenues ₨ (4,761) ₨ 2,585
Net (gain)/loss reclassified to consolidated statement of income on occurrence of hedged transactions under cost of revenues ₨ 1,379 ₨ (498)