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Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount, in Total and by Major Class of Intangible Assets (Detail) ₨ in Millions, $ in Millions	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	₨ 16,002.0		₨ 16,002.0
Accumulated amortization	16,001.0		16,000.0
Net carrying amount	1.0	$ 0.0	2.0
Branch network
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,335.0		8,335.0
Accumulated amortization	8,335.0		8,335.0
Net carrying amount	0.0	0.0	0.0
Customer list
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,710.0		2,710.0
Accumulated amortization	2,710.0		2,710.0
Net carrying amount	0.0	0.0	0.0
Core deposit
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,414.0		4,414.0
Accumulated amortization	4,414.0		4,414.0
Net carrying amount	0.0	0.0	0.0
Favorable leases
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	543.0		543.0
Accumulated amortization	542.0		541.0
Net carrying amount	₨ 1.0	$ 0.0	₨ 2.0

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-Publisher FASB
-Name Accounting Standards Codification
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