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Goodwill and Intangible Assets - Summary of Movement in Intangible Assets (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Disclosure of detailed information about intangible assets [line items]      
Beginning balance ₨ 13,762    
Ending balance 16,362 $ 217 ₨ 13,762
Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 32,869   33,137
Translation adjustment 1,413   772
Acquisition through business combinations (Refer to Note 7) 4,906    
Disposal (Refer to Note 26)     (1,040)
Ending balance 39,188   32,869
Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 19,107   15,024
Translation adjustment 446   99
Amortization 3,273   4,284
Disposal (Refer to Note 26)     (300)
Ending balance 22,826   19,107
Customer related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 11,579    
Ending balance 14,592   11,579
Customer related intangibles [member] | Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 26,924   26,586
Translation adjustment 1,031   555
Acquisition through business combinations (Refer to Note 7) 4,535    
Disposal (Refer to Note 26)     (217)
Ending balance 32,490   26,924
Customer related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 15,345   12,263
Translation adjustment 220   35
Amortization 2,333   3,148
Disposal (Refer to Note 26)     (101)
Ending balance 17,898   15,345
Marketing related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 2,183    
Ending balance 1,770   2,183
Marketing related intangibles [member] | Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 5,945   6,551
Translation adjustment 382   217
Acquisition through business combinations (Refer to Note 7) 371    
Disposal (Refer to Note 26)     (823)
Ending balance 6,698   5,945
Marketing related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 3,762   2,761
Translation adjustment 226   64
Amortization 940   1,136
Disposal (Refer to Note 26)     (199)
Ending balance ₨ 4,928   ₨ 3,762