v3.26.1
Increase in inventory of finished goods - Summary of Increase in inventory of finished goods (Details)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]          
Closing balance of inventories ₨ 5,784   ₨ 1,875 $ 62 $ 20
Increase in inventory (3,909) $ (42) (1,875)    
Finished Goods          
Disclosure of detailed information about property, plant and equipment [line items]          
Closing balance of inventories 5,553   1,875 59 $ 20
Increase in inventory (3,678) (39) ₨ (1,875)    
Emission Reduction Certificates          
Disclosure of detailed information about property, plant and equipment [line items]          
Closing balance of inventories 231     $ 2  
Increase in inventory ₨ (231) $ (2)