Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 528	$ 608
Amortized Intangible Assets, Accumulated Amortization	284	330
Amortized Intangible Assets, Net Carrying Amount	244	278
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,083	1,092
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	229	305
Amortized Intangible Assets, Accumulated Amortization	104	168
Amortized Intangible Assets, Net Carrying Amount	125	137
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	250	251
Amortized Intangible Assets, Accumulated Amortization	157	141
Amortized Intangible Assets, Net Carrying Amount	93	110
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	49	52
Amortized Intangible Assets, Accumulated Amortization	23	21
Amortized Intangible Assets, Net Carrying Amount	26	31
Goodwill
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,083	1,092
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 548	$ 547