Supplemental Financial Statement Data (Schedule of Statement of Earnings) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Apr. 26, 2020	Aug. 01, 2021		Aug. 02, 2020		Jul. 28, 2019
Amortization of Intangible Assets			$ 42		$ 43		$ 48
Impairment of intangible assets	[1]		0		0		16
Net periodic benefits expense (income), other than the service cost			(247)		30		43
Pension settlement charges			(38)		43		28
Investment losses		$ 45	0	[2]	49	[2]	1	[2]
Loss on sales of businesses			11		(975)		32
Transition service fees			(27)		(10)		0
Other			5		2		4
Other expenses / (income)			(254)		221		140
Advertising Expense	[3]		399		463		347
Interest Costs Incurred			214		350		359
Interest Costs Capitalized Adjustment			(4)		(5)		(3)
Interest Expense	[4]		210		345		356
Loss on extinguishment of debt			0		75		0
Continuing Operations [Member]
Loss on sales of businesses	[5]						$ 0
Interest Expense [Member]
Loss on extinguishment of debt					75
Loss on Extinguishment of Debt, before Write off of Debt Issuance Cost					65
Acre Venture Partners [Member]
Investment losses					45
European Chips Business [Member]
Loss on sales of businesses	[5]				$ 64
Plum Baby
Loss on sales of businesses	[5]		$ 11

[1] See Note 3 for additional information.

[2] 2020 includes a loss of $45 related to Acre. See Note 14 for additional information.

[3] Included in Marketing and selling expenses.

[4] In 2020, we recognized a loss of $75 (including $65 of premium, fees and other costs paid with the tender offers and unamortized debt issuance costs). See Note 12 for additional information.

[5] In 2021, we recognized a loss of $11 on the sale of the Plum baby food and snacks business. In 2020, we recognized a loss of $64 on the sale of the European chips business. See Note 3 for additional information.