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Goodwill and Intangible Assets - Summary of Movement in Intangible Assets (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Disclosure of detailed information about intangible assets [line items]      
Beginning balance ₨ 18,113    
Ending balance 13,762 $ 199 ₨ 18,113
Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 33,137   26,807
Translation adjustment 772   596
Acquisition through business combinations     5,734
Disposal (Refer Note 22) (1,040)    
Ending balance 32,869   33,137
Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 15,024   10,885
Translation adjustment 99   25
Amortization and impairment 4,284   4,114
Disposal (Refer Note 22) (300)    
Ending balance 19,107   15,024
Customer related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 14,323    
Ending balance 11,579   14,323
Customer related intangibles [member] | Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 26,586   20,528
Translation adjustment 555   493
Acquisition through business combinations     5,565
Disposal (Refer Note 22) (217)    
Ending balance 26,924   26,586
Customer related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 12,263   9,264
Translation adjustment 35   14
Amortization and impairment 3,148   2,985
Disposal (Refer Note 22) (101)    
Ending balance 15,345   12,263
Marketing related intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 3,790    
Ending balance 2,183   3,790
Marketing related intangibles [member] | Carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 6,551   6,279
Translation adjustment 217   103
Acquisition through business combinations     169
Disposal (Refer Note 22) (823)    
Ending balance 5,945   6,551
Marketing related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 2,761   1,621
Translation adjustment 64   11
Amortization and impairment 1,136   1,129
Disposal (Refer Note 22) (199)    
Ending balance ₨ 3,762   ₨ 2,761