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Income Taxes - Reconciliation of Potential Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Reconciliation of the beginning and ending amount of potential tax benefits |  |  |
Beginning of year | $ 125 | $ 104 | $ 548
Increases in prior year position | 21 | 4 | 41
Increases in current year position | 17 | 17 | 13
Decreases in prior year position | (20) | 0 | (474)
Settlements with taxing authorities | (63) | 0 | (24)
Lapse of statute of limitations | (9) | 0 | 0
End of year | $ 71 | $ 125 | $ 104

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