Note 12 - Hedging Activities - Summary of Notional Amounts and Respective Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Notional amount		$ 14,674	$ 14,740
Asset derivatives, fair value		398	271
Liability derivatives, fair value		(89)	(344)
Translated Earnings Contracts [Member]
Notional amount		8,100	7,500
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Notional amount	[1]	769	1,143
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Asset derivatives, fair value	[1]	47	37
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Accrued Liabilities [Member]
Liability derivatives, fair value	[1]	(2)	(3)
Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member] | Other Assets [Member]
Asset derivatives, fair value		24	21
Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member] | Other Liabilities [Member]
Liability derivatives, fair value			(1)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Notional amount		5,781	6,144
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Asset derivatives, fair value		71	45
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Accrued Liabilities [Member]
Liability derivatives, fair value		(39)	(76)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Liabilities [Member]
Liability derivatives, fair value		(32)	(59)
Not Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member]
Notional amount		8,124	7,453
Not Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member] | Other Current Assets [Member]
Asset derivatives, fair value		98	66
Not Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member] | Other Accrued Liabilities [Member]
Liability derivatives, fair value		(11)	(110)
Not Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member] | Other Assets [Member]
Asset derivatives, fair value		144	61
Not Designated as Hedging Instrument [Member] | Translated Earnings Contracts [Member] | Other Liabilities [Member]
Liability derivatives, fair value		(5)	(95)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Assets [Member]
Asset derivatives, fair value		$ 14	$ 41

[1] At March 31, 2021, the total gross notional values for foreign currency cash flow hedges are $769 million. At December 31, 2020, the foreign exchange contracts that are designated as hedging instruments include the notional amount $892 million of cash flow hedges and $251 million of net investment hedges.