Acquisitions and Dispositions Dispositions (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018	Jun. 29, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 6,125	$ 5,853
Current Assets	9,939		$ 10,625
Current Liabilities	5,898		6,147
Anatomical Pathology business [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	85		$ 344
Current Assets	85
Long-term Assets	540
Current Liabilities	32
Long-term Liabilities	$ 33
Scenario, Forecast [Member] | Anatomical Pathology business [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration				$ 1,140