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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, 2019	Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	₨ 18,534.6	₨ 21,899.1
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	355.9	(76.9)
Purchases/additions	42,885.7	13,110.3
Sales	0.0	0.0
Issuances	0.0	0.0
Settlements	(22,963.3)	(16,397.9)
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	38,812.9	18,534.6
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 gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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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 sale 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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