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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 March 31, 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

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