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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other current assets)  
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 12  
Reductions: payments of contingent consideration (4)  
Changes in fair value (reflected in general and administrative expenses) (3)  
Fair value of contingent consideration at September 30, 2022 14  
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 | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other current assets) 1  
Interest rate swaps (included in other current and non-current liabilities)   46
Fair Value, Measurements, Recurring | Interest Rate Swap | Level I    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other current assets) 0  
Interest rate swaps (included in other current and non-current liabilities)   0
Fair Value, Measurements, Recurring | Interest Rate Swap | Level II    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other current assets) 1  
Interest rate swaps (included in other current and non-current liabilities)   46
Fair Value, Measurements, Recurring | Interest Rate Swap | Level III    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other current assets) 0  
Interest rate swaps (included in other current and non-current liabilities)   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) 14 9
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) $ 14 $ 9