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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, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	₨ 16,002.0		₨ 16,002.0
Accumulated amortization	16,002.0		16,001.0
Net carrying amount	0.0	$ 0.0	1.0
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	543.0		542.0
Net carrying amount	₨ 0.0	$ 0.0	₨ 1.0

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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