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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 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 1  
Reductions: payments of contingent consideration (1)  
Changes in fair value (reflected in general and administrative expenses) 0  
Fair value of contingent consideration at September 30, 2021 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 | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other non-current liabilities) 57 81
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 non-current liabilities) 0 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 non-current liabilities) 57 81
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 non-current liabilities) 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 3
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 $ 3