Note 5 - Goodwill and Intangible Asset Impairment - Goodwill (Details) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
		Apr. 30, 2020	Sep. 30, 2020
Balance	[1]		$ 483
Impairment		$ (217)	(217)
Foreign currency translation adjustments			(2)
Balance			264
UNITED STATES
Balance	[1]		441
Impairment		(177)	(177)
Balance			264
International [Member]
Balance	[1]		42
Impairment		$ (40)	(40)
Foreign currency translation adjustments			$ (2)

[1] Net of prior years’ accumulated impairment of $350 million, $69 million and $183 million in the United States, Canada and International, respectively.