Note 14 - Shareholders' Equity - Summary of Changes in Foreign Currency Translation Adjustment Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Balance		$ 13,448	$ 12,997
Net current-period other comprehensive loss		(352)	(326)
Balance		13,558	12,287
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	[1]	(329)	(857)
Other comprehensive loss	[1],[2]	(355)	(253)
Equity method affiliates	[1],[3]	(8)	(12)
Net current-period other comprehensive loss	[1]	(363)	(265)
Balance	[1]	$ (692)	$ (1,122)

[1] All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss.

[2] For the three months ended March 31, 2021 and 2020, amounts are net of tax benefit of $10 million and $29 million, respectively.

[3] Tax effects are not significant.