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. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 27, 2019	Oct. 28, 2018	Oct. 29, 2017	Oct. 29, 2018		Oct. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				$ 6,845				$ 9,630				$ 7,413	$ 6,845	$ 9,630	$ 7,413
Adoption of new accounting standard																$ 1,553	[1]	$ 0	[2]
Other comprehensive income (loss) before reclassifications													(46)	(84)	66
Amounts reclassified out of AOCI													8	20	(15)
Other comprehensive income (loss), net of tax													(38)	(64)	51
Ending Balance	$ 8,214				$ 6,845				$ 9,630				8,214	6,845	9,630
Quarterly cash dividend declared (usd per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Unrealized Gain (Loss) on Investments, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				$ 7				$ 53				$ 30	7	53	30
Adoption of new accounting standard																(17)		5
Other comprehensive income (loss) before reclassifications													22	(66)	24
Amounts reclassified out of AOCI													(1)	15	(1)
Other comprehensive income (loss), net of tax													21	(51)	23
Ending Balance	$ 11				$ 7				$ 53				11	7	53
Unrealized Gain (Loss) on Derivative Instruments Qualifying as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				(9)				(11)				(18)	(9)	(11)	(18)
Adoption of new accounting standard																0		(2)
Other comprehensive income (loss) before reclassifications													(10)	5	13
Amounts reclassified out of AOCI													3	(1)	(6)
Other comprehensive income (loss), net of tax													(7)	4	7
Ending Balance	(16)				(9)				(11)				(16)	(9)	(11)
Defined and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				(137)				(120)				(141)	(137)	(120)	(141)
Adoption of new accounting standard																0		0
Other comprehensive income (loss) before reclassifications													(57)	(23)	29
Amounts reclassified out of AOCI													6	6	(8)
Other comprehensive income (loss), net of tax													(51)	(17)	21
Ending Balance	(188)				(137)				(120)				(188)	(137)	(120)
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				14				14				14	14	14	14
Adoption of new accounting standard																0		0
Other comprehensive income (loss) before reclassifications													(1)	0	0
Amounts reclassified out of AOCI													0	0	0
Other comprehensive income (loss), net of tax													(1)	0	0
Ending Balance	13				14				14				13	14	14
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance				$ (125)				$ (64)				$ (115)	(125)	(64)	(115)
Adoption of new accounting standard																$ (17)	[1]	$ 3	[2]
Other comprehensive income (loss), net of tax													(38)	(64)	51
Ending Balance	$ (180)				$ (125)				$ (64)				$ (180)	$ (125)	$ (64)

[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. See Note 1.

[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.