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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, 2021
INR (₨)
Mar. 31, 2021
USD ($)
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 2,915.1 39.9
Allowance for credit losses, end of the period 2,915.1 $ 39.9
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  
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  
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  
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  
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  
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  
Credit Substitutes    
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 2,915.1  
Allowance for credit losses, end of the period 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  
Write- offs 0.0  
Net allowance for credit losses 0.0  
Allowance for credit losses, end of the period 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