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Amounts Subject to Enforceable Netting Arrangements (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Derivative [Line Items]      
Derivative assets, gross amounts ₨ 50,836.3 $ 780.8 ₨ 139,217.1
Derivative assets, amounts offset 0.0   0.0
Derivative assets, net amounts reported in the balance sheet 50,836.3   139,217.1
Derivative assets, financial instruments 34,782.9   106,010.2
Derivative assets, financial collateral [1] 4,297.0   2,911.9
Derivative assets, net amount 11,756.4 180.6 30,295.0
Securities purchased under agreements to resell, gross amounts 650,018.6 9,983.4 50,000.0
Securities purchased under agreements to resell, amounts offset 0.0   0.0
Securities purchased under agreements to resell, net amounts reported in the balance sheet 650,018.6   50,000.0
Securities purchased under agreements to resell, financial instruments 0.0   0.0
Securities purchased under agreements to resell, financial collateral [1] 650,018.6   50,000.0
Securities purchased under agreements to resell, net amount 0.0   0.0
Derivative liabilities, gross amounts 56,124.7 862.0 145,060.5
Securities purchased under agreements to resell, net amount 0.0   0.0
Derivative liabilities, amounts offset 0.0   0.0
Derivative liabilities, net amounts reported in the balance sheet 56,124.7   145,060.5
Derivative liabilities, financial instruments 34,782.9   106,010.2
Derivative liabilities, financial collateral [1] 378.3   2,772.7
Derivative liabilities, net amount 20,963.5 322.0 36,277.6
Securities sold under repurchase agreements, gross amounts 138,000.0 2,119.5 0.0
Securities sold under repurchase agreements, amounts offset 0.0   0.0
Securities sold under repurchase agreements, net amounts reported in the balance sheet 138,000.0   0.0
Securities sold under repurchase agreements, financial instruments 0.0   0.0
Securities sold under repurchase agreements, financial collateral [1] 138,000.0   0.0
Securities sold under repurchase agreements, net amount ₨ 0.0 $ 0.0 ₨ 0.0
[1] Comprised of securities and cash collaterals. These amounts are limited to the asset/liability balance, and accordingly, do not include excess collateral received/pledged.