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Stock Options Outstanding, Employees Stock Option Schemes (Detail) - Employee Stock Option
12 Months Ended
Mar. 31, 2024
₨ / shares
shares
Mar. 31, 2024
₨ / shares
$ / shares
shares
Mar. 31, 2023
₨ / shares
shares
Mar. 31, 2022
₨ / shares
shares
Mar. 31, 2021
₨ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Number Of Shares Arising Out Of Options | shares 175,659,424 175,659,424 151,682,461 158,106,016 168,168,760
Weighted Average Exercise Price | ₨ / shares ₨ 1,307.93 ₨ 1,307.93 ₨ 1,264.86 ₨ 1,175.65 ₨ 1,063.79
Plan "E"          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price | (per share) ₨ 1,636.9 ₨ 19.64      
Number Of Shares Arising Out Of Options | shares 5,075,360 5,075,360      
Weighted Average Remaining Life 5 years 11 months 1 day 5 years 11 months 1 day      
Weighted Average Exercise Price | ₨ / shares ₨ 1,636.9 ₨ 1,636.9      
Plan "F"          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 716.6 ₨ 8.6      
Range of exercise price, Upper Range | (per share) ₨ 1,636.9 ₨ 19.64      
Number Of Shares Arising Out Of Options | shares 15,551,708 15,551,708      
Weighted Average Remaining Life 4 years 10 months 2 days 4 years 10 months 2 days      
Weighted Average Exercise Price | ₨ / shares ₨ 1,458.3 ₨ 1,458.3      
Plan "G"          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 882.85 ₨ 10.59      
Range of exercise price, Upper Range | (per share) ₨ 1,673.1 ₨ 20.08      
Number Of Shares Arising Out Of Options | shares 115,413,810 115,413,810      
Weighted Average Remaining Life 2 years 7 months 28 days 2 years 7 months 28 days      
Weighted Average Exercise Price | ₨ / shares ₨ 1,333.8 ₨ 1,333.8      
eHDFC [Member]          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 160.79 ₨ 1.93      
Range of exercise price, Upper Range | (per share) ₨ 1,535.27 ₨ 18.42      
Number Of Shares Arising Out Of Options | shares 39,618,546 39,618,546      
Weighted Average Remaining Life 3 years 5 months 23 days 3 years 5 months 23 days      
Weighted Average Exercise Price | ₨ / shares ₨ 1,131.5 ₨ 1,131.5