Acquisitions (Schedule Of Supplemental Cash Flow Information Regarding Acquisitions) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Supplemental cash flow information regarding acquisitions
Assets acquired		$ 241	$ 15
Liabilities assumed	[1]	(27)	(1)
Net assets acquired		214	15
Net cash paid		160	12
Seller financed debt		42	3
Purchase price		214	$ 15
Deferred tax liabilities		11
Earnout [Member]
Supplemental cash flow information regarding acquisitions
Contingent earnout		$ 12

[1] Includes $11 million of deferred tax liabilities recognized as a result of tax basis differences in intangible assets.