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Fair Value Of Financial Instruments Unobservable Inputs Reconciliation (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Fair Value, Measurements, Recurring  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair value at beginning of period $ 32
Fair value at end of period 33
Contingent Consideration Liability  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Additions 0
Payments 0
Interest accretion 1
Contingent Consideration Liability | Fair Value, Measurements, Recurring  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair value at beginning of period 32
Fair value at end of period $ 33