v3.26.1
Employee Benefits - Re-measurements Of Net Defined Benefit Liability - Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Re-measurements of the net defined benefit liability / (asset)      
Total [1] $ 31 $ 11 $ (15)
Gratuity      
Re-measurements of the net defined benefit liability / (asset)      
Actuarial (gains) / losses (3) 12 4
(Return) / loss on plan assets excluding amounts included in the net interest on the net defined benefit liability / (asset) (6) (2) (2)
Net interest on the net defined benefit liability / (asset) (1) (1)  
Total (9) 10 2
Pension      
Re-measurements of the net defined benefit liability / (asset)      
Actuarial (gains) / losses 9 8 3
(Return) / loss on plan assets excluding amounts included in the net interest on the net defined benefit liability / (asset) (8) (7) (2)
Total 1 1 1
Provident Fund      
Re-measurements of the net defined benefit liability / (asset)      
Actuarial (gains) / losses 11 26 12
(Return) / loss on plan assets excluding amounts included in the net interest on the net defined benefit liability / (asset) 47 (29) (28)
Irrecoverable surplus - effect of asset ceiling (7) 7  
Net interest on the net defined benefit liability / (asset) (1)   3
Total $ 50 $ 4 $ (16)
[1] net of taxes