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Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Earning Per Share Basic And Diluted [Abstract]        
Net income available for common shareholders (A) $ 21,870 $ 16,425 $ 44,161 $ 33,981
Weighted average outstanding shares of common stock (B) 7,432 7,451 7,431 7,454
Dilutive effect of stock-based awards 36 22 34 25
Common stock and common stock equivalents (C) 7,468 7,473 7,465 7,479
Earnings Per Share        
Basic (A/B) $ 2.94 $ 2.2 $ 5.94 $ 4.56
Diluted (A/C) $ 2.93 $ 2.2 $ 5.92 $ 4.54