Industry Segment Operations (Segment Reconciling Items) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 25, 2020	Jul. 26, 2020	Apr. 26, 2020	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 4,688	$ 4,395	$ 3,957	$ 4,162	$ 3,754	$ 3,562	$ 3,539	$ 3,753	$ 17,202	$ 14,608	$ 16,705
Share-based compensation									(307)	(263)	(258)
Income from operations									4,365	3,350	4,491
Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales									73	76	76
Unallocated cost of products sold and expenses									(533)	(322)	(444)
Share-based compensation									(307)	(263)	(258)
Income from operations									$ (767)	$ (509)	$ (626)