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Financial Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Liabilities Rollforward [Roll Forward]    
Fair value of contingent consideration at December 31, 2020 $ 3  
Additions: contingent consideration related to acquisitions completed during the period 7  
Reductions: payments of contingent consideration (1)  
Changes in fair value (reflected in general and administrative expenses) 0  
Fair value of contingent consideration at December 31, 2021 9  
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 $ 1
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 1
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 current and non-current liabilities) 46 81
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 current and 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 current and non-current liabilities) 46 81
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 current and 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) 9 3
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) $ 9 $ 3