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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Investment [Line Items]
Non-operating income	$ 8	$ 3	$ 11	$ 3
Fair Value, Inputs, Level 1
Investment [Line Items]
Fair value of total debt	14,000		14,000		$ 6,000
Fair Value, Inputs, Level 3
Investment [Line Items]
Contingent consideration liability, fair value	12		12
Fair value of line of credit	$ 26		$ 26

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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