Note 15 - Fair Value Measurements and Derivatives - Location and Amount of Gain or (Loss) Recognized in Income on Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total amounts of income and expense line items presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded	$ 2,108	$ 1,994	$ 1,078	$ 1,926	$ 1,987	$ 2,164	$ 2,306	$ 2,163	$ 7,106	$ 8,620	$ 8,143
Cost of sales									6,485	7,489	6,986
Other income (expense), net									22	(25)	(29)
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Sales [Member]
Amount of (gain) loss reclassified from AOCI into income									1
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member]
Amount of (gain) loss reclassified from AOCI into income									18	(9)	(1)
Currency Swap [Member] | Cash Flow Hedging [Member] | Other Income (Expense) [Member]
Amount of (gain) loss reclassified from AOCI into income									$ 99	$ (24)	$ (55)