Divestitures (Condensed Cash Flow Statement) (Details) - USD ($) $ in Millions	3 Months Ended
Nov. 01, 2020	Oct. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of discontinued operations business		$ 40
Purchases of plant assets	$ 74	98
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 0	368
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		21
Proceeds from Divestiture of Businesses, Net of Cash Divested		$ 297

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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