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Provisions - Summary of Activity for Provision for Warranty and Other Provisions (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of other provisions [line items]    
Balance at the beginning of the year ₨ 640 ₨ 799
Additional provision during the year 458 308
Provision used during the year (484) (467)
Balance at the end of the year 614 640
Provision for warranty [member]    
Disclosure of other provisions [line items]    
Balance at the beginning of the year 277 293
Additional provision during the year 360 295
Provision used during the year (318) (311)
Balance at the end of the year 319 277
Other provisions [member]    
Disclosure of other provisions [line items]    
Balance at the beginning of the year 363 506
Additional provision during the year 98 13
Provision used during the year (166) (156)
Balance at the end of the year ₨ 295 ₨ 363