v3.26.1
Sales/transfer of receivables - Summary of Variable Interest Entity Not Primary Beneficiary Disclosures (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Assets:        
Assets ₨ 52,621,193.2 $ 560,814.2 ₨ 48,187,671.1 ₨ 44,118,573.0
Liabilities:        
Liabilities 43,460,498.5 463,183.3 39,564,780.1  
Variable Interest Entity, Primary Beneficiary [Member]        
Assets:        
Assets 149,300.0   183,400.0  
Liabilities:        
Liabilities 150,100.0   183,400.0  
Maximum exposure to loss 27,841.3 296.7 30,369.3  
Debt interests 11,741.5 125.1 17,879.9  
Commitments, guarantees, others 16,099.8 171.6 12,489.4  
Variable Interest Entity, Primary Beneficiary [Member] | Long-term debt [Member]        
Liabilities:        
Liabilities 138,353.7 1,474.5 165,476.8  
Variable Interest Entity, Primary Beneficiary [Member] | Accrued expenses and other liabilities [Member]        
Liabilities:        
Liabilities 71.7 0.8 108.1  
Variable Interest Entity, Primary Beneficiary [Member] | Loans [Member]        
Assets:        
Assets 149,244.1 1,590.6 183,356.8  
Variable Interest Entity, Primary Beneficiary [Member] | Other Assets [Member]        
Assets:        
Assets ₨ 26.6 $ 0.3 ₨ 108.1