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BUSINESS ACQUISITIONS (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 11, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Cash paid for business acquisitions			$ 0	$ 54,000,000	$ 56,000,000	$ 224,000,000
Goodwill		$ 6,617,000,000	6,617,000,000		$ 6,617,000,000		$ 6,563,000,000	$ 6,335,000,000
Customer Relationships
Business Acquisition [Line Items]
Intangible assets, useful life					18 years
Boyce & Bynum
Business Acquisition [Line Items]
Consideration	$ 61,000,000
Cash paid for business acquisitions	55,000,000
Goodwill	41,000,000
Goodwill, expected tax deductible amount	35,000,000
Boyce & Bynum | Customer Relationships
Business Acquisition [Line Items]
Intangible assets	$ 20,000,000
Intangible assets, useful life	15 years
Boyce & Bynum | Other Operating Income
Business Acquisition [Line Items]
Gain due to reduction in liability			6,000,000
Boyce & Bynum | Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Contingent consideration	$ 6,000,000	0	$ 0		$ 0
Oxford Immunotec, Inc.
Business Acquisition [Line Items]
Adjustment, increase to goodwill		13,000,000
Adjustment, decrease to intangible assets		11,000,000
Adjustment, other assets and liabilities		$ 2,000,000

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