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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Type of issue (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Oct. 31, 2019	Jul. 31, 2019
Cash and Cash Equivalents Items [Line Items]
Total cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period	$ 5,458	$ 6,697	$ 1,843	$ 2,352
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	813	800
Available-for-sale debt securities:	819	808
Total cash and cash equivalents, investments, and funds held for customers, amortized cost	6,271	7,497
Total cash and cash equivalents, investments, and funds held for customers, fair value	6,277	7,505
Gross realized gains (losses) on available for sale debt securities	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	5,458	6,697
Cash, cash equivalents, restricted cash, and restricted cash equivalents, fair value	5,458	6,697
Municipal bonds
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	17	9
Available-for-sale debt securities:	17	9
Corporate notes
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	741	744
Available-for-sale debt securities:	747	752
U.S. agency securities
Available-for-sale securities:
Available-for-sale debt securities, amortized cost	55	47
Available-for-sale debt securities:	$ 55	$ 47

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