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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Fair Value, Liabilities Rollforward [Roll Forward] |  |
Fair value of contingent consideration at December 31, 2022 | $ 12 |
Additions: contingent consideration related to acquisitions completed during the period | 0 |
Reductions: payments of contingent consideration | (3) |
Changes in fair value (reflected in general and administrative expenses) | (1) |
Fair value of contingent consideration at June 30, 2023 | 8 |
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) | 1 | $ 1
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) | 1 | 1
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 | 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) | 8 | 12
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) | $ 8 | $ 12

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- Definition Line items represent financial 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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