Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ 5		$ 5
Net Income (Loss) Attributable to Noncontrolling Interest	53	$ 46	100	$ 91
PRISM Vision LLC
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest	25		25
PRISM Vision LLC | Noncontrolling Interests
Noncontrolling Interest [Line Items]
Adjustment to redemption values	2
Core Ventures
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest	700		700
Core Ventures | Noncontrolling Interests
Noncontrolling Interest [Line Items]
Adjustment to redemption values	45
ClarusONE Sourcing Services, Vantage Oncology, SCRI Oncology, and Prism Vision
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interest	$ 48	$ 46	$ 95	$ 91