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Fair Value Of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Measurement adjustments $ 23 $ (14) $ 3
Fair Value, Measurements, Recurring      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of year 33    
Fair value at end of year 49 33  
Contingent Consideration liability      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Additions 0 32  
Payments 7 22  
Interest accretion 0 2  
Measurement adjustments 23 (14)  
Contingent Consideration liability | Fair Value, Measurements, Recurring      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of year 33 35  
Fair value at end of year $ 49 $ 33 $ 35