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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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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

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