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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Revaluation Impact       $ (3)
Contingent Consideration        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period, $ 185 $ 203 $ 189 241
Additions 8 2 34 36
Payments (35) (42) (76) (107)
Revaluation Impact 8 5 19 (3)
Other [1] 2 2 2 3
Balance at September 30, 268 170 268 170
Foreign Exchange Forward | Contingent Consideration        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Change in fair value of FX Forward $ 100 $ 0 $ 100 $ 0
[1] Primarily reflects the impact of foreign exchange.