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Income Taxes - Schedule of Cash Paid for Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
U.S. Federal | $ 0 |  |
Foreign | 5 |  |
Total income taxes paid, net of refunds received | 103 | $ 379 | $ 336
DISTRICT OF COLUMBIA |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
State and local: | 24 |  |
MARYLAND |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
State and local: | 17 |  |
VIRGINIA |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
State and local: | 37 |  |
All other states |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
State and local: | $ 20 |  |

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