Note 8 - Earnings Per Share - Schedule of Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 1,835	$ 1,798	$ 3,465	$ 3,139
Weighted-average number of shares outstanding:
Basic (in shares)	625.6	658.5	628.9	663.1
Diluted (in shares)	626.8	660.1	630.2	664.7
Earnings per share – basic (in dollars per share)	$ 2.93	$ 2.73	$ 5.51	$ 4.73
Earnings per share – diluted (in dollars per share)	$ 2.93	$ 2.72	$ 5.50	$ 4.72
Stock options excluded as their inclusion would be anti-dilutive (in shares)	0.3	0.4	0.3	0.3
Share-Based Payment Arrangement, Option [Member]
Weighted-average number of shares outstanding:
Dilutive effect of share based payment awards (in shares)	0.6	0.8	0.7	0.8
Retention Awards [Member]
Weighted-average number of shares outstanding:
Dilutive effect of share based payment awards (in shares)	0.6	0.8	0.6	0.8