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		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance		$ 12,142	$ 12,133	$ 13,448	$ 12,997
Net current-period other comprehensive (loss) income		(207)	298	(519)	37
Balance		12,355	12,857	12,355	12,857
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	[1]	(652)	(1,064)	(329)	(857)
Other comprehensive income (loss)	[2]	(185)	274	(501)	75
Equity method affiliates	[1],[3]	(7)	9	(14)	1
Net current-period other comprehensive (loss) income	[1]	(192)	283	(515)	76
Balance	[1]	$ (844)	$ (781)	$ (844)	$ (781)

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

[2] For the three and nine months ended September 30, 2021, amounts are net of tax benefit of $31 million and $42 million, respectively. For the three and nine months ended September 30, 2020, amounts are net of tax expense of $21 million and $10 million, respectively.

[3] Tax effects are not significant.