Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 539	$ 526
Amortized Intangible Assets, Accumulated Amortization	173	157
Amortized Intangible Assets, Net Carrying Amount	366	369
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,006	973
License Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	270	263
Amortized Intangible Assets, Accumulated Amortization	89	81
Amortized Intangible Assets, Net Carrying Amount	181	182
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	228	222
Amortized Intangible Assets, Accumulated Amortization	75	68
Amortized Intangible Assets, Net Carrying Amount	153	154
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	41	41
Amortized Intangible Assets, Accumulated Amortization	9	8
Amortized Intangible Assets, Net Carrying Amount	32	33
Goodwill [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,006	973
Trademarks [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 552	$ 548