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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Revaluation Impact				$ (3)	$ 5
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period,		$ 203	$ 279	241	309
Additions		2	1	36	9
Payments		(42)	(35)	(107)	(85)
Revaluation Impact		5	(13)	(3)	5
Other	[1]	2	0	3	(6)
Balance at September 30,		$ 170	$ 232	$ 170	$ 232

[1] (a) Primarily reflects the impact of foreign exchange.