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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling interests | $ 395 | $ 380 |
Net income attributable to noncontrolling interests | 337 | 186 | $ 158
ClarusONE Sourcing Services, Vantage Oncology and SCRI Oncology |  |  |
Noncontrolling Interest [Line Items] |  |  |
Noncontrolling interests | 395 | 380 |
Net income attributable to noncontrolling interests | 197 | $ 186 | $ 158
PRISM Vision Holdings, LLC |  |  |
Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interest | 25 |  |
Core Ventures |  |  |
Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interest | $ 700 |  |

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