XML 178 R171.htm IDEA: XBRL DOCUMENT v3.25.1
Employee Benefits - Additional Information (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of defined benefit plans [line items]      
Cash settled [1] ₨ 5,542 ₨ 5,590 ₨ 3,958
Total expense of Employee benefits plans 20,306 19,227 17,623
Provident Fund Obligation [member]      
Disclosure of defined benefit plans [line items]      
Total expense of provident fund 6,517 6,265 5,941
Defined contribution plans [Member]      
Disclosure of defined benefit plans [line items]      
Total expense of Employee benefits plans 10,584 9,969 9,000
Cash Settled RSU [Member]      
Disclosure of defined benefit plans [line items]      
Cash settled ₨ (9) 6 ₨ (11)
Actuarial assumption of discount rates [member]      
Disclosure of defined benefit plans [line items]      
Percentage of reasonably possible increase in actuarial assumption 1.00%    
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible increase in actuarial assumption ₨ (1,565) (1,436)  
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible decrease in actuarial assumption ₨ 1,807 1,649  
Actuarial assumption of expected rates of salary increases [member]      
Disclosure of defined benefit plans [line items]      
Percentage of reasonably possible increase in actuarial assumption 1.00%    
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible increase in actuarial assumption ₨ 1,189 1,118  
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible decrease in actuarial assumption ₨ (1,129) ₨ (1,051)  
[1] Includes ₹ (11), ₹ 6 and ₹ (9) for the years ended March 31, 2023, 2024 and 2025, respectively, towards cash settled ADS RSUs.