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		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance		$ 13,558	$ 12,287	$ 13,448	$ 12,997
Net current-period other comprehensive income (loss)		40	65	(312)	(261)
Balance		12,142	12,133	12,142	12,133
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	[1]	(692)	(1,122)	(329)	(857)
Other comprehensive income (loss)	[2]	39	55	(316)	(198)
Equity method affiliates	[1],[3]	1	3	(7)	(9)
Net current-period other comprehensive income (loss)		40	58	(323)	(207)
Balance	[1]	$ (652)	$ (1,064)	$ (652)	$ (1,064)

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

[2] For the three and six months ended June 30, 2021, amounts are net of tax benefit of $1 million and $11 million, respectively. For the three and six months ended June 30, 2020, amounts are net of tax expense of $5 million and tax benefit of $17 million, respectively.

[3] Tax effects are not significant.