Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items]
Document Fiscal Year Focus	2019
Amortized Intangible Assets, Gross Carrying Amount	$ 605	$ 608
Amortized Intangible Assets, Accumulated Amortization	344	330
Amortized Intangible Assets, Net Carrying Amount	261	278
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,086	1,092
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	306	305
Amortized Intangible Assets, Accumulated Amortization	177	168
Amortized Intangible Assets, Net Carrying Amount	129	137
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	248	251
Amortized Intangible Assets, Accumulated Amortization	145	141
Amortized Intangible Assets, Net Carrying Amount	103	110
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	51	52
Amortized Intangible Assets, Accumulated Amortization	22	21
Amortized Intangible Assets, Net Carrying Amount	29	31
Goodwill (a)
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,086	1,092
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 548	$ 547