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Short-term Borrowing and Long-term Debt (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2023	Jul. 31, 2022	Aug. 01, 2021
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 29
Line of Credit Facility Utilized Borrowing Capacity	1
Payments related to extinguishment of debt	0	$ 453	$ 0
Loss on extinguishment of debt	0	4	0
Long-term borrowings	500	0	0
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,850
Line of Credit Facility, Expiration Date	Sep. 27, 2026
Line of Credit Facility, Covenant Terms	minimum consolidated interest coverage ratio of consolidated adjusted EBITDA to consolidated interest expense (as each is defined in the credit facility) of not less than 3.25:1.00, measured quarterly, and customary events of default for credit facilities of this type
Interest Expense [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt		4
Loss on Extinguishment of Debt, before Write off of Debt Issuance Cost		$ 3
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	5.43%	2.63%
3.65% notes, due 2023
Debt Instrument [Line Items]
Repayments of Debt	$ 566
Debt Instrument, Maturity Date	Mar. 15, 2023
Debt Instrument, Interest Rate, Stated Percentage	3.65%
3.30% notes, due 2021
Debt Instrument [Line Items]
Repayments of Debt			$ 321
Debt Instrument, Interest Rate, Stated Percentage			3.30%
Variable Interest Rate due 2021 [Member]
Debt Instrument [Line Items]
Repayments of Debt			$ 400
2.50% notes, due 2023
Debt Instrument [Line Items]
Repayments of Debt		$ 450
Debt Instrument, Maturity Date		Aug. 02, 2022
Payments related to extinguishment of debt		$ 453
Debt Instrument, Interest Rate, Stated Percentage		2.50%
8.875% notes, due 2021
Debt Instrument [Line Items]
Repayments of Debt			$ 200
Debt Instrument, Interest Rate, Stated Percentage			8.875%
Variable Interest Rate due 2025
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 500
Line of Credit Facility, Covenant Terms	minimum consolidated interest coverage ratio of consolidated adjusted EBITDA to consolidated interest expense (as each is defined in the DDTL Credit Agreement) of not less than 3.25:1.00
Debt Instrument, Maturity Date	Nov. 15, 2025
Long-term borrowings	$ 500