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Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Revaluation Impact $ 11 $ 5
Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period, 508 189
Additions 11 6
Payments (35) (40)
Revaluation Impact 11 5
Other [1] 1 1
Balance at March 31, 454 161
Foreign Exchange Forward | Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in fair value of the FX contract $ (42) $ 0
[1] Primarily reflects the impact of foreign exchange.