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Goodwill and Intangible Assets - Summary of Movement in Goodwill Balance (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Reconciliation of changes in goodwill [abstract]      
Balance at the beginning of the year ₨ 116,980   ₨ 117,584
Translation adjustment 9,199   4,529
Acquisition through business combination, net (Refer to Note 7) 4,833    
Disposal (Refer to Note 26)     (4,893)
Assets reclassified as held for sale (Refer to Note 26)     (240)
Balance at the end of the year ₨ 131,012 $ 1,738 ₨ 116,980