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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Fair Value, Liabilities Rollforward [Roll Forward] |  |
Fair value of contingent consideration at December 31, 2018 | $ 10 |
Additions: contingent consideration related to acquisitions completed during the period | 0 |
Reductions: payments of contingent consideration | (4) |
Changes in fair value (reflected in general and administrative expenses) | (2) |
Fair value of contingent consideration at September 30, 2019 | 4 |
Fair Value, Measurements, Recurring | Deferred Compensation Plan Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets (included in other non-current assets) | 2 | $ 2
Fair Value, Measurements, Recurring | Deferred Compensation Plan Assets | Level I |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets (included in other non-current assets) | 2 | 2
Fair Value, Measurements, Recurring | Deferred Compensation Plan Assets | Level II |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets (included in other non-current assets) | 0 | 0
Fair Value, Measurements, Recurring | Deferred Compensation Plan Assets | Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets (included in other non-current assets) | 0 | 0
Fair Value, Measurements, Recurring | Interest Rate Swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current assets) |  | 6
Interest rate swaps (included in other non-current liabilities) | 60 | 16
Fair Value, Measurements, Recurring | Interest Rate Swap | Level I |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current assets) |  | 0
Interest rate swaps (included in other non-current liabilities) | 0 | 0
Fair Value, Measurements, Recurring | Interest Rate Swap | Level II |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current assets) |  | 6
Interest rate swaps (included in other non-current liabilities) | 60 | 16
Fair Value, Measurements, Recurring | Interest Rate Swap | Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current assets) |  | 0
Interest rate swaps (included in other non-current liabilities) | 0 | 0
Fair Value, Measurements, Recurring | Contingent Consideration for Acquisitions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | 4 | 10
Fair Value, Measurements, Recurring | Contingent Consideration for Acquisitions | Level I |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | 0 | 0
Fair Value, Measurements, Recurring | Contingent Consideration for Acquisitions | Level II |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | 0 | 0
Fair Value, Measurements, Recurring | Contingent Consideration for Acquisitions | Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | $ 4 | $ 10

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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