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Information about Changes in Fair Value of Level 3 Assets (Detail) - Asset-backed securities - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	₨ 21,899.1	₨ 17,008.1
Total gains or losses (realized/unrealized) -Included in net income	0.0	0.0
Total gains or losses (realized/unrealized)- Included in other comprehensive income	(76.9)	115.8
Purchases/additions	13,110.3	19,233.1
Sales	0.0	0.0
Issuances	0.0	0.0
Settlements	(16,397.9)	(14,457.9)
Transfers in Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Foreign currency translation adjustment	0.0	0.0
Ending Balance	18,534.6	21,899.1
Total amount of gains or (losses) included in net income attributable to change in unrealized gains or (losses) relating to assets still held at reporting date	₨ 0.0	₨ 0.0

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Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Foreign Currency Translation Adjustments

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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