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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | $ 557 | $ 546
Amortized Intangible Assets, Accumulated Amortization | 307 | 298
Amortized Intangible Assets, Net Carrying Amount | 250 | 248
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,069 | 1,101
License agreements |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 257 | 241
Amortized Intangible Assets, Accumulated Amortization | 112 | 108
Amortized Intangible Assets, Net Carrying Amount | 145 | 133
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 250 | 255
Amortized Intangible Assets, Accumulated Amortization | 169 | 165
Amortized Intangible Assets, Net Carrying Amount | 81 | 90
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 50 | 50
Amortized Intangible Assets, Accumulated Amortization | 26 | 25
Amortized Intangible Assets, Net Carrying Amount | 24 | 25
Goodwill |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,069 | 1,101
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 544 | $ 550

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