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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | $ 571 | $ 546
Amortized Intangible Assets, Accumulated Amortization | 328 | 298
Amortized Intangible Assets, Net Carrying Amount | 243 | 248
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,077 | 1,101
License agreements |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 266 | 241
Amortized Intangible Assets, Accumulated Amortization | 123 | 108
Amortized Intangible Assets, Net Carrying Amount | 143 | 133
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 254 | 255
Amortized Intangible Assets, Accumulated Amortization | 177 | 165
Amortized Intangible Assets, Net Carrying Amount | 77 | 90
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 51 | 50
Amortized Intangible Assets, Accumulated Amortization | 28 | 25
Amortized Intangible Assets, Net Carrying Amount | 23 | 25
Goodwill |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,077 | 1,101
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 547 | $ 550

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