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Note 7 - Earnings Per Share - Schedule of Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income	$ 1,630	$ 1,341
Weighted-average number of shares outstanding:
Basic (in shares)	632.2	667.6
Diluted (in shares)	633.6	669.2
Earnings per share – basic (in dollars per share)	$ 2.58	$ 2.01
Earnings per share – diluted (in dollars per share)	$ 2.57	$ 2.00
Stock options excluded as their inclusion would be anti-dilutive (in shares)	0.1	0.3
Share-based Payment Arrangement, Option [Member]
Weighted-average number of shares outstanding:
Dilutive effect of share based payment awards (in shares)	0.7	0.8
Retention Awards [Member]
Weighted-average number of shares outstanding:
Dilutive effect of share based payment awards (in shares)	0.7	0.8

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