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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Type of issue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Jul. 31, 2019
Jul. 31, 2018
Cash and Cash Equivalents Items [Line Items]            
Total cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period $ 1,902 $ 1,309 $ 1,902 $ 1,309 $ 2,352 $ 1,631
Available-for-sale securities:            
Available-for-sale debt securities, amortized cost 821   821   822  
Available-for-sale debt securities 825   825   824  
Other long-term investments, amortized cost 13   13   13  
Total cash and cash equivalents, investments, and funds held for customers, Amortized Cost 2,736   2,736   3,187  
Total cash and cash equivalents, investments, and funds held for customers, Fair Value 2,740   2,740   3,189  
Gross realized gains (losses) on available for sale debt securities 0 $ 0 0 $ 0    
Unrealized gain (loss) on available for sale debt securities     0   0  
Total cash, cash equivalents, restricted cash, and restricted cash equivalents            
Cash and Cash Equivalents Items [Line Items]            
Total cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period 1,902   1,902   2,352  
Cash, cash equivalents, restricted cash, and restricted cash equivalents, fair value 1,902   1,902   2,352  
Municipal bonds            
Available-for-sale securities:            
Available-for-sale debt securities, amortized cost 1   1   5  
Available-for-sale debt securities 1   1   5  
Corporate notes            
Available-for-sale securities:            
Available-for-sale debt securities, amortized cost 790   790   798  
Available-for-sale debt securities 794   794   800  
U.S. agency securities            
Available-for-sale securities:            
Available-for-sale debt securities, amortized cost 30   30   19  
Available-for-sale debt securities $ 30   $ 30   $ 19