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Basis Of Presentation Financial Instruments - Fair Value Measurements (Details) - USD ($)
 3 Months Ended
Mar. 31, 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 $ 59,000,000  
Additions: contingent consideration related to acquisitions during the period 0  
Reductions: payments of contingent consideration (reflected in the financing section of the Statement of Cash Flows) (3,000,000)  
Changes in fair value (reflected in the Statement of Operations) 0  
Fair value of contingent consideration at March 31, 2016 56,000,000  
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) 73,000,000 $ 47,000,000
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) 73,000,000 47,000,000
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
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) 3,000,000 3,000,000
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) 3,000,000 3,000,000
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 56,000,000 59,000,000
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 $ 56,000,000 $ 59,000,000