Note 6 - Earnings Per Share - Schedule of Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income	$ 1,630	$ 1,630
Weighted-average number of shares outstanding:
Basic (in shares)	610.6	632.2
Diluted (in shares)	611.5	633.6
Earnings per share – basic (in dollars per share)	$ 2.67	$ 2.58
Earnings per share – diluted (in dollars per share)	$ 2.67	$ 2.57
Stock options excluded as their inclusion would be anti-dilutive (in shares)	0.8	0.1
Share-Based Payment Arrangement, Option [Member]
Weighted-average number of shares outstanding:
Dilutive effect of share based payment awards (in shares)	0.4	0.7
Retention Awards [Member]
Weighted-average number of shares outstanding:
Dilutive effect of share based payment awards (in shares)	0.5	0.7