v3.26.1
Related party transaction (Details 1)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Disclosure of transactions between related parties [line items]        
Lease rentals paid ₨ 429 $ 5 ₨ 279 ₨ 377
Parent [Member]        
Disclosure of transactions between related parties [line items]        
Consultancy services received 0   0 0
Sitting fees paid 0   0 0
Salaries and other short term benefits [1] 0   0 0
Contributions to defined contribution plans [1] 0   0 0
Share based payment transactions [1] 0   0 0
Lease rentals paid 3   2 1
CSR Contribution made 0   0 0
Amount of outstanding balances        
6% Non-Cumulative Compulsorily convertible preference shares       0
Advance lease rentals and refundable deposits made 1   1 0
Lease rentals payable 0   0 0
Other related parties [Member]        
Disclosure of transactions between related parties [line items]        
Consultancy services received 0   0 0
Sitting fees paid 0   0 0
Salaries and other short term benefits [1] 0   0 0
Contributions to defined contribution plans [1] 0   0 0
Share based payment transactions [1] 0   0 0
Lease rentals paid 10   9 9
CSR Contribution made 25   20 28
Amount of outstanding balances        
6% Non-Cumulative Compulsorily convertible preference shares       500
Advance lease rentals and refundable deposits made 6   6 6
Lease rentals payable 0   0 1
Key management personnel of entity or parent [Member]        
Disclosure of transactions between related parties [line items]        
Consultancy services received 0   0 0
Sitting fees paid 15   7 3
Salaries and other short term benefits [1] 46   50 62
Contributions to defined contribution plans [1] 2   3 3
Share based payment transactions [1] 0   0 0
Lease rentals paid 0   0 0
CSR Contribution made 0   0 0
Amount of outstanding balances        
6% Non-Cumulative Compulsorily convertible preference shares       0
Advance lease rentals and refundable deposits made 0   0 0
Lease rentals payable ₨ 0   ₨ 0 ₨ 0
[1]

Represents salaries and other benefits of Key Management Personnel comprising of Mr. M P Vijay Kumar – Executive Director and Chief Financial Officer, Mr. C R Rao – Chief Operating Officer and Mr. Kamal Nath - Chief Executive Officer (for March 31, 2025 and March 31, 2024).