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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, 2020	Apr. 30, 2021	Jul. 31, 2020
Debt Instrument [Line Items]
Long-term debt			$ 2,033	$ 2,031
Senior Unsecured Notes \| The Senior Unsecured Notes Member
Debt Instrument [Line Items]
Proceeds from issuance	$ 1,980
Unamortized discount	2
Debt issuance costs	$ 15
Long-term debt, gross			2,000	2,000
Unamortized discount and debt issuance costs			(15)	(17)
Long-term debt			$ 1,985	1,983
Interest paid		$ 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%
Long-term debt, gross			$ 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%
Long-term debt, gross			$ 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%
Long-term debt, gross			$ 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%
Long-term debt, gross			$ 500	$ 500
Effective Interest Rate			1.767%