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Business Acquisitions and Divestitures (Details) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	Feb. 04, 2025	Dec. 30, 2024	Dec. 31, 2024	Dec. 31, 2024
PRISM Vision Holdings | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition, percentage of controlling interest acquired	80.00%
Cash payments to acquire business	$ 850
PRISM Vision Holdings | PRISM Vision Physicians | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage retained	20.00%
Disposed of by sale | Canadian retail disposal group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestiture		$ 9
Noncash divestiture, amount of consideration received		$ 120
Noncash divestiture payable period (in years)		6 years
Assets held for sale		$ 741
Trade accounts payable		$ 125
Canadian businesses held for sale			$ 23	$ 666
Accumulated other comprehensive loss in charge for remeasurement to fair value				$ 48

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