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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Document Fiscal Year Focus | 2018 |
Amortized Intangible Assets, Gross Carrying Amount | $ 610 | $ 574
Amortized Intangible Assets, Accumulated Amortization | 316 | 277
Amortized Intangible Assets, Net Carrying Amount | 294 | 297
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,064 | 1,073
License agreements (a) |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 319 | 281
Amortized Intangible Assets, Accumulated Amortization | 160 | 140
Amortized Intangible Assets, Net Carrying Amount | 159 | 141
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 240 | 242
Amortized Intangible Assets, Accumulated Amortization | 136 | 119
Amortized Intangible Assets, Net Carrying Amount | 104 | 123
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 51 | 51
Amortized Intangible Assets, Accumulated Amortization | 20 | 18
Amortized Intangible Assets, Net Carrying Amount | 31 | 33
Goodwill (b) |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,064 | 1,073
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 550 | $ 553

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