Income Taxes - Schedule Of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Income Tax Disclosure [Abstract] | |||
| Unrecognized tax benefits, beginning balance | $ 688 | $ 804 | $ 867 |
| Increases in unrecognized tax benefits related to prior year tax positions | 41 | 18 | 14 |
| Decreases in unrecognized tax benefits related to prior year tax positions | (22) | (214) | (173) |
| Increases in unrecognized tax benefits related to current year tax positions | 63 | 94 | 97 |
| Decreases in unrecognized tax benefits related to settlements with taxing authorities | (94) | (12) | |
| Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations | (5) | (2) | (2) |
| Changes in unrecognized tax benefits due to foreign currency translation | 6 | 1 | |
| Unrecognized tax benefits, ending balance | $ 677 | $ 688 | $ 804 |