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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Liabilities Rollforward [Roll Forward]    
Fair value of contingent consideration at December 31, 2017 $ 34  
Additions: contingent consideration related to acquisitions completed during the period 0  
Reductions: payments of contingent consideration (4)  
Changes in fair value (reflected in the Consolidated Statement of Operations) (1)  
Fair value of contingent consideration at June 30, 2018 29  
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) 3 $ 3
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) 3 3
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 assets) 12  
Interest rate swaps (included in other current and non-current liabilities) 7 13
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 assets) 0  
Interest rate swaps (included in other current and 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 assets) 12  
Interest rate swaps (included in other current and non-current liabilities) 7 13
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 assets) 0  
Interest rate swaps (included in other current and 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) 29 34
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) $ 29 $ 34