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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Document Fiscal Year Focus | 2017 |
Document Period End Date | Sep. 30, 2017 |
Amortized Intangible Assets, Gross Carrying Amount | $ 569 | $ 531
Amortized Intangible Assets, Accumulated Amortization | 261 | 211
Amortized Intangible Assets, Net Carrying Amount | 308 | 320
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,065 | 1,007
License agreements |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 279 | 261
Amortized Intangible Assets, Accumulated Amortization | 133 | 109
Amortized Intangible Assets, Net Carrying Amount | 146 | 152
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 240 | 224
Amortized Intangible Assets, Accumulated Amortization | 113 | 90
Amortized Intangible Assets, Net Carrying Amount | 127 | 134
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 50 | 46
Amortized Intangible Assets, Accumulated Amortization | 15 | 12
Amortized Intangible Assets, Net Carrying Amount | 35 | 34
Goodwill (a) |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,065 | 1,007
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 555 | $ 550

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