Financial Instruments - Schedule of Carrying Value and Fair Value of Financial Instruments by Categories (Parenthetical) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of detailed information about financial instruments [abstract] | ||
| Interest accrued on quoted debt securities carried at amortized cost | $ 9 | $ 10 |