Divestitures (Condensed Cash Flow Statement) (Details) - USD ($) $ in Millions	12 Months Ended
Jul. 31, 2022	Aug. 01, 2021	Aug. 02, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gain) loss on sales of discontinued operations businesses			$ (1,039)
Purchases of plant assets	$ 242	$ 275	299
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	101	2,537
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchases of plant assets	$ 0	$ 0	30
Proceeds from Divestiture of Businesses, Net of Cash Divested			$ 2,466

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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