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, 2018	Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Revaluation Impact		$ 5	$ (16)
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period,		189	241
Additions		6	34
Payments		(40)	(12)
Revaluation Impact		5	(16)
Other	[1]	1	0
Balance at March 31,		$ 161	$ 247

[1] Primarily reflects the impact of foreign exchange.