Financial Instruments (Schedule of Cash Flow Hedges in Statements of Earnings) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		May 02, 2021	Aug. 01, 2021	Aug. 02, 2020	Jul. 28, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cost of products sold			$ 5,665	$ 5,692	$ 5,414
Other expenses / (income)			(254)	221	140
Interest expense	[1]		210	345	356
Earnings (loss) from discontinued operations		$ (6)	(6)	1,036	(263)
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
Other Expenses/Income [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
Foreign Exchange 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]
Cost of products sold			6	(2)	(4)
Other expenses / (income)			1	0	0
Earnings (loss) from discontinued operations			0	(1)	(2)
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	$ 1	$ 2

[1] In 2020, we recognized a loss of $75 (including $65 of premium, fees and other costs paid with the tender offers and unamortized debt issuance costs). See Note 12 for additional information.