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Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Document Fiscal Year Focus | 2017 |
Document Period End Date | Mar. 31, 2017 |
Amortized Intangible Assets, Gross Carrying Amount | $ 531 | $ 531
Amortized Intangible Assets, Accumulated Amortization | 223 | 211
Amortized Intangible Assets, Net Carrying Amount | 308 | 320
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,013 | 1,007
License agreements |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 260 | 261
Amortized Intangible Assets, Accumulated Amortization | 115 | 109
Amortized Intangible Assets, Net Carrying Amount | 145 | 152
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 226 | 224
Amortized Intangible Assets, Accumulated Amortization | 96 | 90
Amortized Intangible Assets, Net Carrying Amount | 130 | 134
Other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Amortized Intangible Assets, Gross Carrying Amount | 45 | 46
Amortized Intangible Assets, Accumulated Amortization | 12 | 12
Amortized Intangible Assets, Net Carrying Amount | 33 | 34
Goodwill |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount | 1,013 | 1,007
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount | $ 551 | $ 550

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