Income Taxes - Narrative (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Operating Loss Carryforwards [Line Items] | |||
| Net operating losses | $ 10 | $ 9 | |
| Reserves for uncertain tax positions | 142 | 115 | $ 552 |
| Unrecognized tax benefits that would impact effective tax rate | 125 | 104 | 91 |
| Unrecognized tax benefits that decrease deferred tax assets | 3 | 1 | |
| Accrued interest and penalties | 7 | 7 | 3 |
| Income tax reserve, accrued penalties and interest | 20 | $ 13 | $ 6 |
| Federal | |||
| Operating Loss Carryforwards [Line Items] | |||
| Net operating losses | 1 | ||
| State | |||
| Operating Loss Carryforwards [Line Items] | |||
| Net operating losses | 4 | ||
| Foreign | |||
| Operating Loss Carryforwards [Line Items] | |||
| Net operating losses | $ 5 | ||