Stockholders' Equity, Comprehensive Income and Share-Based Compensation (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ / shares in Units, $ 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. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance					$ 8,214				$ 6,845				$ 9,630	$ 8,214	$ 6,845	$ 9,630
Other comprehensive income (loss) before reclassifications														(120)	(46)	(84)
Amounts reclassified out of AOCI														1	8	20
Other comprehensive income (loss), net of tax														(119)	(38)	(64)
Ending Balance		$ 10,578				$ 8,214				$ 6,845				$ 10,578	$ 8,214	$ 6,845
Cash dividend declared (usd per share)		$ 0.22	$ 0.22	$ 0.22	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.10	$ 0.87	$ 0.83	$ 0.70
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]								$ 1,553						$ 1,553
Ending Balance	[1]									$ 1,553						$ 1,553
Unrealized Gain (Loss) on Investments, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance					$ 11				7				$ 53	$ 11	7	53
Reclassification adjustment related to the early adoption of Accounting Standards Update (ASU) 2018-02																5
Other comprehensive income (loss) before reclassifications														16	22	(66)
Amounts reclassified out of AOCI														(7)	(1)	15
Other comprehensive income (loss), net of tax														9	21	(51)
Ending Balance		$ 20				$ 11				7				20	11	7
Unrealized Gain (Loss) on Investments, Net | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance									(17)						(17)
Ending Balance										(17)						(17)
Unrealized Gain (Loss) on Derivative Instruments Qualifying as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance					(16)				(9)				(11)	(16)	(9)	(11)
Reclassification adjustment related to the early adoption of Accounting Standards Update (ASU) 2018-02																(2)
Other comprehensive income (loss) before reclassifications														(115)	(10)	5
Amounts reclassified out of AOCI														(2)	3	(1)
Other comprehensive income (loss), net of tax														(117)	(7)	4
Ending Balance		(133)				(16)				(9)				(133)	(16)	(9)
Unrealized Gain (Loss) on Derivative Instruments Qualifying as Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance									0						0
Ending Balance										0						0
Defined and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance					(188)				(137)				(120)	(188)	(137)	(120)
Reclassification adjustment related to the early adoption of Accounting Standards Update (ASU) 2018-02																0
Other comprehensive income (loss) before reclassifications														(21)	(57)	(23)
Amounts reclassified out of AOCI														10	6	6
Other comprehensive income (loss), net of tax														(11)	(51)	(17)
Ending Balance		(199)				(188)				(137)				(199)	(188)	(137)
Defined and Postretirement Benefit Plans | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance									0						0
Ending Balance										0						0
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance					13				14				14	13	14	14
Reclassification adjustment related to the early adoption of Accounting Standards Update (ASU) 2018-02																0
Other comprehensive income (loss) before reclassifications														0	(1)	0
Amounts reclassified out of AOCI														0	0	0
Other comprehensive income (loss), net of tax														0	(1)	0
Ending Balance		13				13				14				13	13	14
Cumulative Translation Adjustments | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance									0						0
Ending Balance										0						0
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance					$ (180)				(125)				$ (64)	(180)	(125)	(64)
Reclassification adjustment related to the early adoption of Accounting Standards Update (ASU) 2018-02	[2]															3
Other comprehensive income (loss), net of tax														(119)	(38)	(64)
Ending Balance		$ (299)				$ (180)				(125)				$ (299)	(180)	(125)
AOCI Attributable to Parent | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]								$ (17)						$ (17)
Ending Balance	[1]									$ (17)						$ (17)

[1] Represents the adjustment related to the adoption of Accounting Standard Update (ASU) 2016-01 Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities and ASU 2016-16 Income Tax (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.

[2] Represents the reclassification adjustment related to the early adoption of Accounting Standards Update (ASU) 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.