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Other Liabilities and Provisions - Summary of Activity for Provision for Warranty and Other Provisions (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of other provisions [line items]    
Balance at the beginning of the year ₨ 799 ₨ 1,274
Additional provision during the year 308 324
Provision used during the year (467) (799)
Balance at the end of the year 640 799
Provision for warranty [member]    
Disclosure of other provisions [line items]    
Balance at the beginning of the year 293 440
Additional provision during the year 295 317
Provision used during the year (311) (464)
Balance at the end of the year 277 293
Other provisions [member]    
Disclosure of other provisions [line items]    
Balance at the beginning of the year 506 834
Additional provision during the year 13 7
Provision used during the year (156) (335)
Balance at the end of the year ₨ 363 ₨ 506