v3.25.2
Intangible Assets - Summary of Changes in Intangible Assets and Goodwill (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill ₨ 37,883   ₨ 38,595  
Charge for the year 1,632 $ 19 1,485 ₨ 1,464
Ending Balance of Intangible assets and goodwill 36,217 424 37,883 38,595
Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 45,840   45,004 44,654
Additions during the year 145   960 377
Assets held for sale (29)      
Disposals and adjustments during the year       (15)
Capitalised during the year (76)   (124) (12)
Ending Balance of Intangible assets and goodwill 45,880   45,840 45,004
Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 7,957   6,409 4,930
Assets held for sale 20      
Charge for the year 1,632   1,485 1,464
Capitalised during the year 94   63 15
Ending Balance of Intangible assets and goodwill 9,663   7,957 6,409
Computer software        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 540   372  
Ending Balance of Intangible assets and goodwill 424 5 540 372
Computer software | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 926   622 355
Additions during the year 35   304 267
Assets held for sale (29)      
Ending Balance of Intangible assets and goodwill 932   926 622
Computer software | Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 386   250 179
Assets held for sale 20      
Charge for the year 48   136 56
Capitalised during the year 94     15
Ending Balance of Intangible assets and goodwill 508   386 250
Customer contracts        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 25,027   26,438  
Ending Balance of Intangible assets and goodwill 23,611 276 25,027 26,438
Customer contracts | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 32,592   32,592 32,592
Ending Balance of Intangible assets and goodwill 32,592   32,592 32,592
Customer contracts | Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 7,565   6,154 4,746
Charge for the year 1,416   1,348 1,408
Capitalised during the year     63  
Ending Balance of Intangible assets and goodwill 8,981   7,565 6,154
Development rights        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 30   31  
Ending Balance of Intangible assets and goodwill 30 0 30 31
Development rights | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 36   36 36
Ending Balance of Intangible assets and goodwill 36   36 36
Development rights | Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 6   5 5
Charge for the year 0   1  
Ending Balance of Intangible assets and goodwill 6   6 5
Other Intangible assets        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 7   7  
Ending Balance of Intangible assets and goodwill 6 0 7 7
Other Intangible assets | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 7   7 7
Ending Balance of Intangible assets and goodwill 7   7 7
Other Intangible assets | Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 0   0 0
Charge for the year 1   0 0
Ending Balance of Intangible assets and goodwill 1   0 0
Carbon credit rights        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 626      
Ending Balance of Intangible assets and goodwill 459 5 626  
Carbon credit rights | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 626      
Additions during the year     626  
Ending Balance of Intangible assets and goodwill 626   626  
Carbon credit rights | Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Charge for the year 167      
Ending Balance of Intangible assets and goodwill 167      
Goodwill        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 11,596   11,596  
Ending Balance of Intangible assets and goodwill 11,596 136 11,596 11,596
Goodwill | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 11,596   11,596 11,596
Ending Balance of Intangible assets and goodwill 11,596   11,596 11,596
Intangible asset under development        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 57   151  
Ending Balance of Intangible assets and goodwill 91 $ 1 57 151
Intangible asset under development | Cost        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 57   151 68
Additions during the year 110   30 110
Disposals and adjustments during the year       (15)
Capitalised during the year (76)   (124) (12)
Ending Balance of Intangible assets and goodwill 91   57 151
Intangible asset under development | Accumulated amortisation        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning Balance of Intangible assets and goodwill 0   0  
Charge for the year 0   0 0
Ending Balance of Intangible assets and goodwill ₨ 0   ₨ 0 ₨ 0