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Stockholders' Equity - Stock Repurchase Programs, Treasury Shares, and Dividends on Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2022
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2022
Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock repurchased (in shares)       2.4  
Total stock repurchased, including amounts not included under repurchase plans       $ 1,350  
Stock repurchases under stock repurchase programs   $ 489 $ 380 1,346 $ 555
Stock repurchase program, remaining authorized repurchase amount   2,000   $ 2,000  
Common stock, dividends, per share, cash paid (in dollars per share)       $ 2.04  
Dividends declared   $ 197 $ 166 $ 586 $ 486
Cash dividends declared per common share (in dollars per share)   $ 0.68 $ 0.59 $ 2.04 $ 1.77
Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash dividends declared per common share (in dollars per share) $ 0.68        
Series of Common Stock Repurchase Programs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchases under stock repurchase programs       $ 1,330