Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 571	$ 546
Amortized Intangible Assets, Accumulated Amortization	328	298
Amortized Intangible Assets, Net Carrying Amount	243	248
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,077	1,101
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	266	241
Amortized Intangible Assets, Accumulated Amortization	123	108
Amortized Intangible Assets, Net Carrying Amount	143	133
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	254	255
Amortized Intangible Assets, Accumulated Amortization	177	165
Amortized Intangible Assets, Net Carrying Amount	77	90
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	51	50
Amortized Intangible Assets, Accumulated Amortization	28	25
Amortized Intangible Assets, Net Carrying Amount	23	25
Goodwill
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,077	1,101
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 547	$ 550