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Long-Term Obligations and Commitments - Senior Unsecured Notes (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Jun. 30, 2020	Apr. 30, 2022	Apr. 30, 2021	Jul. 31, 2021
Debt Instrument [Line Items]
Total future principal payments for long-term debt		$ 6,870
Long-term debt		6,853		$ 2,034
Senior Unsecured Notes \| The Senior Unsecured Notes Member
Debt Instrument [Line Items]
Proceeds from issuance	$ 1,980
Unamortized discount	2
Debt issuance costs	$ 15
Total future principal payments for long-term debt		2,000		2,000
Unamortized discount and debt issuance costs		(12)		(14)
Long-term debt		1,988		1,986
Interest paid		$ 12	$ 12
Redemption price (in percent)	101.00%
Senior Unsecured Notes \| 0.650% notes due July 2023
Debt Instrument [Line Items]
Stated interest rate (in percent)		0.65%
Total future principal payments for long-term debt		$ 500		500
Effective Interest Rate		0.837%
Senior Unsecured Notes \| 0.950% notes due July 2025
Debt Instrument [Line Items]
Stated interest rate (in percent)		0.95%
Total future principal payments for long-term debt		$ 500		500
Effective Interest Rate		1.127%
Senior Unsecured Notes \| 1.350% notes due July 2027
Debt Instrument [Line Items]
Stated interest rate (in percent)		1.35%
Total future principal payments for long-term debt		$ 500		500
Effective Interest Rate		1.486%
Senior Unsecured Notes \| 1.650% notes due July 2030
Debt Instrument [Line Items]
Stated interest rate (in percent)		1.65%
Total future principal payments for long-term debt		$ 500		$ 500
Effective Interest Rate		1.767%