Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 588	$ 602
Accumulated Amortization	390	380
Net Carrying Amount	198	222
Indefinite-lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,121	1,137
Trademarks
Indefinite-lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	552	552
License agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	275	280
Accumulated Amortization	159	151
Net Carrying Amount	116	129
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	261	268
Accumulated Amortization	198	196
Net Carrying Amount	63	72
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52	54
Accumulated Amortization	33	33
Net Carrying Amount	$ 19	$ 21