Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Document Fiscal Year Focus	2017
Document Period End Date	Jun. 30, 2017
Amortized Intangible Assets, Gross Carrying Amount	$ 556	$ 531
Amortized Intangible Assets, Accumulated Amortization	241	211
Amortized Intangible Assets, Net Carrying Amount	315	320
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,043	1,007
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	272	261
Amortized Intangible Assets, Accumulated Amortization	122	109
Amortized Intangible Assets, Net Carrying Amount	150	152
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	235	224
Amortized Intangible Assets, Accumulated Amortization	105	90
Amortized Intangible Assets, Net Carrying Amount	130	134
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	49	46
Amortized Intangible Assets, Accumulated Amortization	14	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	1,043	1,007
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 552	$ 550