Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Jul. 26, 2020	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Income Tax Examination [Line Items]
GILTI benefit reversed	$ 96
Tax expense for transition tax and re-measurement of deferred tax assets				$ 1,100
Tax expense related to changes in uncertain tax positions			$ 87
Excess tax benefit			42
Tax holiday benefit		$ 215
Tax holiday benefit per diluted share (in dollars per share)		$ 0.23
Increases in tax positions for prior years		$ 91	441	83
Income tax penalties and interest expense (benefit)		24	24	12
Unrecognized tax benefits that would impact effective tax rate		410	758	294
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities		446	1	152
Noncurrent Liabilities
Income Tax Examination [Line Items]
Interest and penalties related to uncertain tax positions		74	$ 50	$ 26
Research and development tax credit carryforwards | State and Local Jurisdiction
Income Tax Examination [Line Items]
Tax credit carryforwards		327
Carried over until exhausted | State and Local Jurisdiction
Income Tax Examination [Line Items]
Tax credit carryforwards		309
Carried over the next fifteen years | State and Local Jurisdiction
Income Tax Examination [Line Items]
Tax credit carryforwards		$ 15
Tax credit carryforward, term		15 years
SINGAPORE
Income Tax Examination [Line Items]
Foreign statutory income tax rate				17.00%
Income tax expense recognized from settled tax audits		$ 26
SINGAPORE | Foreign Tax Authority
Income Tax Examination [Line Items]
Income tax paid or accrued		72
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities		$ 374
ISRAEL | Foreign Tax Authority
Income Tax Examination [Line Items]
Income tax paid or accrued				$ 158
Income tax expense from settlement with tax authorities				$ 6