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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount $ 618 $ 608
Amortized Intangible Assets, Accumulated Amortization 361 330
Amortized Intangible Assets, Net Carrying Amount 257 278
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount 1,107 1,092
License agreements    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount 308 305
Amortized Intangible Assets, Accumulated Amortization 183 168
Amortized Intangible Assets, Net Carrying Amount 125 137
Customer relationships    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount 258 251
Amortized Intangible Assets, Accumulated Amortization 154 141
Amortized Intangible Assets, Net Carrying Amount 104 110
Other    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount 52 52
Amortized Intangible Assets, Accumulated Amortization 24 21
Amortized Intangible Assets, Net Carrying Amount 28 31
Goodwill    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount 1,107 1,092
Trademarks    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount $ 549 $ 547