Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Fair Value, Liabilities Rollforward [Roll Forward]
Fair value of contingent consideration at December 31, 2023	$ 4
Additions: contingent consideration related to acquisitions completed during the period	0
Reductions: payments of contingent consideration	(1)
Changes in fair value (reflected in general and administrative expenses)	0
Fair value of contingent consideration at June 30, 2024	3
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)	3	4
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)	$ 3	$ 4

Fair Value, Liabilities Rollforward [Roll Forward]

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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.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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- Definition

Amount of issuances 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.

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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.

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Fair value 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.

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- Definition

Fair value portion of other assets.

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Fair value portion of other liabilities.

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