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Financial Instruments (Schedule of Cash Flow Hedges in Statements of Earnings) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Aug. 02, 2020	Apr. 26, 2020	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cost of products sold									$ 5,692	$ 5,414	$ 4,241
Interest expense									345	356	183
Earnings (loss) from discontinued operations	$ 0	$ 2	$ 1,037	$ (3)	$ (3)	$ (39)	$ (235)	$ 14	1,036	(263)	(463)
Cost Of Products Sold [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net									0	0	0
Interest Expense [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net									0	0	0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net									0	0	0
Foreign Exchange Forward Contracts [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cost of products sold									(2)	(4)	5
Earnings (loss) from discontinued operations									(1)	(2)	4
Interest Rate Contract [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense									$ 1	$ 2	$ 2