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Business Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Jun. 02, 2025	Apr. 01, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026	Jan. 30, 2026
Disposal Group, Including Discontinued Operations [Line Items]
Goodwill			$ 11,278		$ 11,316
Disposed of by sale | Norway Disposal Group
Disposal Group, Including Discontinued Operations [Line Items]
Consideration for disposal of business						$ 821
Divested net assets						$ 140
Gain on remeasurement to fair value					480
Accumulated other comprehensive loss in charge for remeasurement to fair value					$ 164
PRISM Vision LLC
Disposal Group, Including Discontinued Operations [Line Items]
Controlling interest acquired (as a percent)		80.00%
Cash payments to acquire business		$ 875
Redeemable noncontrolling interests		25
Intangible assets		510
Goodwill		437
PRISM Vision LLC | Redeemable Noncontrolling Interests
Disposal Group, Including Discontinued Operations [Line Items]
Redeemable noncontrolling interests		$ 25	0	$ 25
PRISM Vision LLC | PRISM Vision Physicians
Disposal Group, Including Discontinued Operations [Line Items]
Ownership retained (as a percent)		20.00%
Core Ventures
Disposal Group, Including Discontinued Operations [Line Items]
Controlling interest acquired (as a percent)	70.00%
Cash payments to acquire business	$ 2,481
Redeemable noncontrolling interests	700
Intangible assets	2,310
Goodwill	$ 752
Core Ventures | Redeemable Noncontrolling Interests
Disposal Group, Including Discontinued Operations [Line Items]
Redeemable noncontrolling interests			$ 0	$ 700
Core Ventures | FCS Physicians
Disposal Group, Including Discontinued Operations [Line Items]
Ownership retained (as a percent)	30.00%
Exercisable term (in years)	5 years

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