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Note 8 - Earnings Per Share - Schedule of Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income $ 1,895 $ 1,673 $ 5,360 $ 4,812
Weighted-average number of shares outstanding:        
Basic (in shares) 620.4 648.7 626.1 658.3
Diluted (in shares) 621.5 650.3 627.4 659.9
Earnings per share – basic (in dollars per share) $ 3.05 $ 2.58 $ 8.56 $ 7.31
Earnings per share – diluted (in dollars per share) $ 3.05 $ 2.57 $ 8.54 $ 7.29
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) 0.5 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