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Financial Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Liabilities Rollforward [Roll Forward] |  |
Fair value of contingent consideration at December 31, 2019 | $ 4 |
Additions: contingent consideration related to acquisitions completed during the period | 1 |
Reductions: payments of contingent consideration | (2) |
Changes in fair value (reflected in general and administrative expenses) | 0 |
Fair value of contingent consideration at December 31, 2020 | 3 |
Deferred compensation plan assets (included in other non-current assets) | Fair Value Measurements Recurring Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets (included in other non-current assets) | 1 | $ 2
Deferred compensation plan assets (included in other non-current assets) | Fair Value Measurements Recurring Member | 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 | 2
Deferred compensation plan assets (included in other non-current assets) | Fair Value Measurements Recurring Member | 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
Deferred compensation plan assets (included in other non-current assets) | Fair Value Measurements Recurring Member | 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
Interest rate swap contracts | Fair Value Measurements Recurring Member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current liabilities) | 81 | 47
Interest rate swap contracts | Fair Value Measurements Recurring Member | Level I |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current liabilities) | 0 | 0
Interest rate swap contracts | Fair Value Measurements Recurring Member | Level II |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current liabilities) | 81 | 47
Interest rate swap contracts | Fair Value Measurements Recurring Member | Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps (included in other non-current liabilities) | 0 | 0
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | Fair Value Measurements Recurring Member |  |
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
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | Fair Value Measurements Recurring Member | 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
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | Fair Value Measurements Recurring Member | 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
Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities) | Fair Value Measurements Recurring Member | 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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