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Investments, Available for Sale Debt Securities -Summary of Allowances for Available for sale debt Securities (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period ₨ 2,915.1 $ 38.4 ₨ 0.0
Write- offs 0.0 0.0 0.0
Net allowance for credit losses (2,915.1) (38.4) 2,915.1
Allowance for credit losses, end of the period 0.0 $ 0.0 2,915.1
Debt securities, other than asset and mortgage0.0backed securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period 0.0   0.0
Mortgage-backed securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period 0.0   0.0
Asset-backed securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period 0.0   0.0
Other securities (including mutual fund units)      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period 0.0   0.0
Government of India securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period 0.0   0.0
State government securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period 0.0   0.0
Credit Substitutes      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 2,915.1   0.0
Write- offs 0.0   0.0
Net allowance for credit losses (2,915.1)   2,915.1
Allowance for credit losses, end of the period 0.0   2,915.1
Other corporate/financial institution bonds      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0   0.0
Write- offs 0.0   0.0
Net allowance for credit losses 0.0   0.0
Allowance for credit losses, end of the period 0.0   0.0
Government securities outside India      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Allowance for credit losses, beginning of the period 0.0    
Write- offs 0.0    
Net allowance for credit losses 0.0    
Allowance for credit losses, end of the period ₨ 0.0   ₨ 0.0