Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 584	$ 546
Amortized Intangible Assets, Accumulated Amortization	352	298
Amortized Intangible Assets, Net Carrying Amount	232	248
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,112	1,101
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	271	241
Amortized Intangible Assets, Accumulated Amortization	136	108
Amortized Intangible Assets, Net Carrying Amount	135	133
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	261	255
Amortized Intangible Assets, Accumulated Amortization	186	165
Amortized Intangible Assets, Net Carrying Amount	75	90
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	52	50
Amortized Intangible Assets, Accumulated Amortization	30	25
Amortized Intangible Assets, Net Carrying Amount	22	25
Goodwill
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,112	1,101
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 548	$ 550