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Related Party Relationships and Transactions - Summary of Related Party Transactions (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of transactions between related parties [line items]      
Dividend ₨ 361 ₨ 609 ₨ 311
Buyback of shares   110,000 [1] 25,000
Rent Paid 6,490 6,236 5,953
Entities controlled by directors [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods and services 102 136 114
Assets purchased 240 290 106
Dividend 3,171 3,171 5,087
Buyback of shares   63,745 19,638
Rental income 43 42 43
Rent Paid 8 7 8
Others 63 31 93
Balance as at the year end      
Receivables 132 39 76
Payables 8 57 22
Key management personnel [member]      
Disclosure of transactions between related parties [line items]      
Dividend 191 191 287
Buyback of shares     2
Rent Paid 5 6 6
Remuneration and short-term benefits 341 248 231
Other benefits 173 130 156
Balance as at the year end      
Payables ₨ 155 ₨ 55 ₨ 27
[1] Refer Note 18