Intangible Assets (Schedule Of Intangible Assets) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 602	$ 602
Accumulated Amortization	415	380
Net Carrying Amount	187	222
Indefinite-lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	1,114	1,137
Trademarks
Indefinite-lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	551	552
License agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	291	280
Accumulated Amortization	177	151
Net Carrying Amount	114	129
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	259	268
Accumulated Amortization	202	196
Net Carrying Amount	57	72
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52	54
Accumulated Amortization	36	33
Net Carrying Amount	$ 16	$ 21