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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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Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity.

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