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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]    
Document Fiscal Year Focus 2018  
Amortized Intangible Assets, Gross Carrying Amount $ 592 $ 574
Amortized Intangible Assets, Accumulated Amortization 293 277
Amortized Intangible Assets, Net Carrying Amount 299 297
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount 1,085 1,073
License agreements    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount 294 281
Amortized Intangible Assets, Accumulated Amortization 147 140
Amortized Intangible Assets, Net Carrying Amount 147 141
Customer relationships    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount 246 242
Amortized Intangible Assets, Accumulated Amortization 127 119
Amortized Intangible Assets, Net Carrying Amount 119 123
Other    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount 52 51
Amortized Intangible Assets, Accumulated Amortization 19 18
Amortized Intangible Assets, Net Carrying Amount 33 33
Goodwill (a)    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount 1,085 1,073
Trademarks    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount $ 550 $ 553