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Divestitures (Condensed Cash Flow Statement) (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 26, 2020
Jan. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Payments to Acquire Property, Plant, and Equipment $ 167 $ 198
Proceeds from Divestiture of Businesses, Net of Cash Divested 2,533 0
Asset Impairment Accelerated Depreciation [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Discontinued Operations, Impairment charges 0 360
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]    
Disposal Group, Including Discontinued Operation, Depreciation and Amortization [1] 0 54
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax 1,036 0
Payments to Acquire Property, Plant, and Equipment 30 34
Proceeds from Divestiture of Businesses, Net of Cash Divested $ 2,462 $ 0
[1] Depreciation and amortization are no longer recognized once businesses are classified as held for sale/discontinued operations.