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Employee Benefits - Summary of Employee Costs (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of defined benefit plans [abstract]      
Salaries and bonus ₨ 289,005 ₨ 261,981 ₨ 258,207
Employee benefits plans      
Gratuity and other defined benefit plans 1,459 1,532 1,095
Defined contribution plans 7,372 7,363 7,037
Share based compensation 1,938 1,347 1,742
Total employee cost ₨ 299,774 ₨ 272,223 ₨ 268,081