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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | $ 528 | $ 608
Amortized Intangible Assets, Accumulated Amortization | 284 | 330
Amortized Intangible Assets, Net Carrying Amount | 244 | 278
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,083 | 1,092
License agreements |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 229 | 305
Amortized Intangible Assets, Accumulated Amortization | 104 | 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 | 250 | 251
Amortized Intangible Assets, Accumulated Amortization | 157 | 141
Amortized Intangible Assets, Net Carrying Amount | 93 | 110
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 49 | 52
Amortized Intangible Assets, Accumulated Amortization | 23 | 21
Amortized Intangible Assets, Net Carrying Amount | 26 | 31
Goodwill |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,083 | 1,092
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 548 | $ 547

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