Supplemental Financial Statement Data (Schedule of Balance Sheets) (Details) - USD ($) $ in Millions		12 Months Ended
		Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Receivables [Abstract]
Customer accounts receivable		$ 544	$ 538
Allowances		(14)	(13)
Accounts receivable, net current		530	525
Other receivables		45	49
Accounts receivable, net		575	574
Inventory, Net [Abstract]
Inventory, raw materials, containers and supplies		297	271
Inventory, finished products		574	592
Inventories		871	863
Property, Plant and Equipment, Net [Abstract]
Land		75	83
Buildings and Improvements, Gross		1,473	1,474
Machinery and Equipment, Gross		3,463	3,473
Construction in Progress, Gross		274	185
Property, Plant and Equipment, Gross		5,285	5,215
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	[1]	(2,917)	(2,760)
Plant assets, net of depreciation		2,368	2,455	$ 2,466
Other Assets, Noncurrent [Abstract]
Investments		0	77
Pensions		10	21
Operating Lease, Right-of-Use Asset		254	0
Other Assets, Miscellaneous, Noncurrent		19	29
Other assets		283	127
Other Liabilities, Current [Abstract]
Accrued liabilities		693	609
Other Liabilities, Noncurrent [Abstract]
Other liabilities		820	559
Depreciation		285	389	360
Continuing Operations [Member]
Other Liabilities, Noncurrent [Abstract]
Depreciation		285	315	$ 259
Accrued Liabilities [Member]
Other Liabilities, Current [Abstract]
Employee-related Liabilities, Current		252	234
Derivative Liability, Current		11	8
Accrued Marketing Costs, Current		156	135
Interest Payable, Current		79	97
Restructuring Reserve, Current		12	29
Operating Lease, Liability, Current		67	0
Other Accrued Liabilities, Current		116	106
Other Liabilities [Member]
Other Liabilities, Noncurrent [Abstract]
Liability, Defined Benefit Pension Plan, Noncurrent		242	179
Liability, Other Retirement Benefits, Noncurrent		220	210
Operating Lease, Liability, Noncurrent		184	0
Deferred Compensation Liability, Noncurrent		80	79
Liability, Uncertain Tax Positions, Noncurrent		17	19
Restructuring Reserve, Noncurrent		3	8
Other Liabilities, Noncurrent		$ 74	$ 64
Building [Member] | Minimum [Member]
Other Liabilities, Noncurrent [Abstract]
Property, Plant and Equipment, Useful Life		7 years
Building [Member] | Maximum [Member]
Other Liabilities, Noncurrent [Abstract]
Property, Plant and Equipment, Useful Life		45 years
Machinery and Equipment [Member] | Minimum [Member]
Other Liabilities, Noncurrent [Abstract]
Property, Plant and Equipment, Useful Life		2 years
Machinery and Equipment [Member] | Maximum [Member]
Other Liabilities, Noncurrent [Abstract]
Property, Plant and Equipment, Useful Life		20 years

[1] Depreciation expense was $285 in 2020, $389 in 2019 and $360 in 2018. Depreciation expense of continuing operations was $285 in 2020, $315 in 2019 and $259 in 2018. Buildings are depreciated over periods ranging from 7 to 45 years. Machinery and equipment are depreciated over periods generally ranging from 2 to 20 years.