Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Document Fiscal Year Focus	2018
Amortized Intangible Assets, Gross Carrying Amount	$ 597	$ 574
Amortized Intangible Assets, Accumulated Amortization	303	277
Amortized Intangible Assets, Net Carrying Amount	294	297
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,049	1,073
License agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	310	281
Amortized Intangible Assets, Accumulated Amortization	154	140
Amortized Intangible Assets, Net Carrying Amount	156	141
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	238	242
Amortized Intangible Assets, Accumulated Amortization	130	119
Amortized Intangible Assets, Net Carrying Amount	108	123
Other
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	49	51
Amortized Intangible Assets, Accumulated Amortization	19	18
Amortized Intangible Assets, Net Carrying Amount	30	33
Goodwill (a)
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,049	1,073
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 549	$ 553