Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Document Fiscal Year Focus	2017
Document Period End Date	Sep. 30, 2017
Amortized Intangible Assets, Gross Carrying Amount	$ 569	$ 531
Amortized Intangible Assets, Accumulated Amortization	261	211
Amortized Intangible Assets, Net Carrying Amount	308	320
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,065	1,007
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	279	261
Amortized Intangible Assets, Accumulated Amortization	133	109
Amortized Intangible Assets, Net Carrying Amount	146	152
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	240	224
Amortized Intangible Assets, Accumulated Amortization	113	90
Amortized Intangible Assets, Net Carrying Amount	127	134
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	50	46
Amortized Intangible Assets, Accumulated Amortization	15	12
Amortized Intangible Assets, Net Carrying Amount	35	34
Goodwill (a)
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,065	1,007
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 555	$ 550