Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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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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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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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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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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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Investment [Line Items]
Fair value of total debt			$ 6,000
Non-operating income	$ 3	$ 0
Fair Value, Inputs, Level 1
Investment [Line Items]
Fair value of total debt	6,000
Fair Value, Inputs, Level 2
Investment [Line Items]
Derivative liability, fair value	35
Fair Value, Inputs, Level 3
Investment [Line Items]
Contingent consideration liability, fair value	12
Fair value of line of credit	$ 28