Note 16 - Summary of Other Operating Expense (Income), Net (Parentheticals) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Other Operating Income Expense Net [Line Items]
Loss on sale of shares		$ 12
Other Operating Expense (Income) [Member] | Trade Names [Member]
Other Operating Income Expense Net [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 4		$ 13
Other Operating Expense (Income) [Member] | Building [Member]
Other Operating Income Expense Net [Line Items]
Carrying value of assets	$ 2