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Stockholders' Equity - Stock Repurchase Programs, Treasury Shares, and Dividends on Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2021
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock repurchased (in shares)       1,400    
Stock repurchases under stock repurchase programs   $ 380,000,000 $ 40,000,000 $ 555,000,000 $ 318,000,000  
Stock repurchases under stock repurchase programs settled after period end       13,000,000    
Stock repurchase program, remaining authorized repurchase amount   1,800,000,000   $ 1,800,000,000    
Common stock, dividends, per share, cash paid (in dollars per share)       $ 1.77    
Dividends declared   $ 166,000,000 $ 140,000,000 $ 486,000,000 $ 421,000,000  
Cash dividends declared per common share (in dollars per share)   $ 0.59 $ 0.53 $ 1.77 $ 1.59 $ 1.59
Treasury Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock repurchases under stock repurchase programs   $ 380,000,000 $ 40,000,000 $ 555,000,000 $ 318,000,000  
Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cash dividends declared per common share (in dollars per share) $ 0.59