Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Liabilities Rollforward [Roll Forward]
Fair value of contingent consideration at December 31, 2021	$ 9
Additions: contingent consideration related to acquisitions completed during the period	13
Reductions: payments of contingent consideration	(4)
Changes in fair value (reflected in general and administrative expenses)	(6)
Fair value of contingent consideration at December 31, 2022	12
Fair Value Measurements Recurring Member | Deferred compensation plan assets (included in other non-current 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 Member | Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities)
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)	12	9
Fair Value Measurements Recurring Member | Interest rate swap contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps (included in other current and non-current liabilities)		46
Fair Value Measurements Recurring Member | Level I | Deferred compensation plan assets (included in other non-current 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 Member | Level I | Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities)
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 Member | Level I | Interest rate swap contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps (included in other current and non-current liabilities)		0
Fair Value Measurements Recurring Member | Level II | Deferred compensation plan assets (included in other non-current assets)
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 Member | Level II | Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities)
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 Member | Level II | Interest rate swap contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps (included in other current and non-current liabilities)		46
Fair Value Measurements Recurring Member | Level III | Deferred compensation plan assets (included in other non-current assets)
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 Member | Level III | Contingent consideration for acquisitions (included in accrued expenses and other current liabilities and other non-current liabilities)
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)	$ 12	9
Fair Value Measurements Recurring Member | Level III | Interest rate swap contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps (included in other current and non-current liabilities)		$ 0