v3.26.1
Employee Benefits - Summary of Defined Benefit Plans Amount Recognized in Group's Financial Statements - Change in Plan Assets (Details) - Plan Assets - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Gratuity    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance $ 319 $ 249
Interest Income 21 18
Remeasurements - Returns on plan assets excluding amounts included in interest income 6 2
Employer contribution 163 77
Benefits paid (23) (21)
Translation differences (42) (6)
Ending balance 444 319
Pension    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 133 119
Interest Income 2 2
Remeasurements - Returns on plan assets excluding amounts included in interest income 8 7
Employer contribution 7 5
Employee contribution 5 4
Benefits paid 10 (7)
Translation differences 12 3
Ending balance 177 133
Provident Fund    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 1,629 1,416
Interest Income 107 101
Remeasurements - Returns on plan assets excluding amounts included in interest income (47) 29
Employer contribution 132 125
Employee contribution 230 199
Benefits paid (218) (204)
Translation differences (174) (37)
Ending balance $ 1,659 $ 1,629