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Balances Payable to Related Parties (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Related Party Transaction [Line Items]
Balances in non-interest-bearing deposits	₨ 1,190,102.2	$ 18,278.3	₨ 1,153,678.9
Balances in interest-bearing deposits	6,693,649.3	102,805.2	5,277,644.0
Principal Owner
Related Party Transaction [Line Items]
Balances in non-interest-bearing deposits	21,758.0		24,262.8
Balances in interest-bearing deposits	10,749.7		739.7
Accrued expenses and other liabilities	327.8		336.7
Total	32,835.5		25,339.2
Others
Related Party Transaction [Line Items]
Balances in non-interest-bearing deposits	11,771.8		11,708.6
Balances in interest-bearing deposits	1,905.0		713.4
Total	13,676.8		12,422.0
Related Party
Related Party Transaction [Line Items]
Balances in non-interest-bearing deposits	33,529.8	515.0	35,971.4
Balances in interest-bearing deposits	12,654.7	194.4	1,453.1
Accrued expenses and other liabilities	327.8	5.0	336.7
Total	₨ 46,512.3	$ 714.4	₨ 37,761.2

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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