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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Document Fiscal Year Focus | 2019 |
Amortized Intangible Assets, Gross Carrying Amount | $ 605 | $ 608
Amortized Intangible Assets, Accumulated Amortization | 344 | 330
Amortized Intangible Assets, Net Carrying Amount | 261 | 278
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,086 | 1,092
License agreements |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 306 | 305
Amortized Intangible Assets, Accumulated Amortization | 177 | 168
Amortized Intangible Assets, Net Carrying Amount | 129 | 137
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 248 | 251
Amortized Intangible Assets, Accumulated Amortization | 145 | 141
Amortized Intangible Assets, Net Carrying Amount | 103 | 110
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 51 | 52
Amortized Intangible Assets, Accumulated Amortization | 22 | 21
Amortized Intangible Assets, Net Carrying Amount | 29 | 31
Goodwill (a) |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,086 | 1,092
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 548 | $ 547

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