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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of contingent consideration at December 31, 2015 $ 59  
Additions: contingent consideration related to acquisitions completed during the period 19  
Reductions: payments of contingent consideration (reflected in the financing section of the Consolidated Statement of Cash Flows) (23)  
Changes in fair value (reflected in the Consolidated Statement of Operations) (2)  
Fair value of contingent consideration at September 30, 2016 53  
Deferred Compensation Plan Assets [Member] | Fair Value, Measurements, Recurring    
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
Deferred Compensation Plan Assets [Member] | Fair Value, Measurements, Recurring | 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
Deferred Compensation Plan Assets [Member] | Fair Value, Measurements, Recurring | 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 [Member] | Fair Value, Measurements, Recurring | 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
Contingent Consideration for Acquisitions [Member] | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Liabilities, Fair Value Disclosure 53 59
Contingent Consideration for Acquisitions [Member] | Fair Value, Measurements, Recurring | Level I    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Liabilities, Fair Value Disclosure 0 0
Contingent Consideration for Acquisitions [Member] | Fair Value, Measurements, Recurring | Level II    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Liabilities, Fair Value Disclosure 0 0
Contingent Consideration for Acquisitions [Member] | Fair Value, Measurements, Recurring | Level III    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Liabilities, Fair Value Disclosure 53 59
Interest Rate Swap | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other non-current liabilities) 71 47
Interest Rate Swap | Fair Value, Measurements, Recurring | 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
Interest Rate Swap | Fair Value, Measurements, Recurring | Level II    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps (included in other non-current liabilities) 71 47
Interest Rate Swap | Fair Value, Measurements, Recurring | 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