Fair Value Measurements - Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Apr. 26, 2020	Oct. 27, 2019	Apr. 28, 2019
Equity investments with readily determinable values
Equity investments with readily determinable values	$ 155	$ 157
Liabilities, Fair Value Disclosure [Abstract]
Restricted cash equivalents included in deferred income taxes and other assets	115		$ 0
Money market funds* | Deferred Income Taxes and Other Assets, Net
Liabilities, Fair Value Disclosure [Abstract]
Restricted cash equivalents included in deferred income taxes and other assets	115
U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	386	337
Municipal securities
Assets:
Available-for-sale debt security investments	402	406
Commercial paper, corporate bonds and medium-term notes
Assets:
Available-for-sale debt security investments	557	647
Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	597	635
Publicly traded equity securities
Equity investments with readily determinable values
Equity investments with readily determinable values	38	45
Recurring fair value measurements
Assets:
Available-for-sale debt security investments	6,313	4,093
Equity investments with readily determinable values
Equity investments with readily determinable values	38	45
Total assets	6,351	4,138
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	180	0
Recurring fair value measurements | Money market funds*
Assets:
Available-for-sale debt security investments	4,346	1,677
Recurring fair value measurements | U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	386	341
Recurring fair value measurements | Non-U.S. government securities
Assets:
Available-for-sale debt security investments	4	10
Recurring fair value measurements | Municipal securities
Assets:
Available-for-sale debt security investments	401	406
Recurring fair value measurements | Commercial paper, corporate bonds and medium-term notes
Assets:
Available-for-sale debt security investments	579	1,024
Recurring fair value measurements | Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	597	635
Recurring fair value measurements | Publicly traded equity securities
Equity investments with readily determinable values
Equity investments with readily determinable values	38	45
Recurring fair value measurements | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative liability, fair value disclosure	180	0
Recurring fair value measurements | Level 1
Assets:
Available-for-sale debt security investments	4,715	2,000
Equity investments with readily determinable values
Equity investments with readily determinable values	38	45
Total assets	4,753	2,045
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Recurring fair value measurements | Level 1 | Money market funds*
Assets:
Available-for-sale debt security investments	4,346	1,677
Recurring fair value measurements | Level 1 | U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	369	323
Recurring fair value measurements | Level 1 | Non-U.S. government securities
Assets:
Available-for-sale debt security investments	0	0
Recurring fair value measurements | Level 1 | Municipal securities
Assets:
Available-for-sale debt security investments	0	0
Recurring fair value measurements | Level 1 | Commercial paper, corporate bonds and medium-term notes
Assets:
Available-for-sale debt security investments	0	0
Recurring fair value measurements | Level 1 | Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	0	0
Recurring fair value measurements | Level 1 | Publicly traded equity securities
Equity investments with readily determinable values
Equity investments with readily determinable values	38	45
Recurring fair value measurements | Level 1 | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative liability, fair value disclosure	0	0
Recurring fair value measurements | Level 2
Assets:
Available-for-sale debt security investments	1,598	2,093
Equity investments with readily determinable values
Equity investments with readily determinable values	0	0
Total assets	1,598	2,093
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	180	0
Recurring fair value measurements | Level 2 | Money market funds*
Assets:
Available-for-sale debt security investments	0	0
Recurring fair value measurements | Level 2 | U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	17	18
Recurring fair value measurements | Level 2 | Non-U.S. government securities
Assets:
Available-for-sale debt security investments	4	10
Recurring fair value measurements | Level 2 | Municipal securities
Assets:
Available-for-sale debt security investments	401	406
Recurring fair value measurements | Level 2 | Commercial paper, corporate bonds and medium-term notes
Assets:
Available-for-sale debt security investments	579	1,024
Recurring fair value measurements | Level 2 | Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	597	635
Recurring fair value measurements | Level 2 | Publicly traded equity securities
Equity investments with readily determinable values
Equity investments with readily determinable values	0	0
Recurring fair value measurements | Level 2 | Interest rate contracts
Liabilities, Fair Value Disclosure [Abstract]
Derivative liability, fair value disclosure	$ 180	$ 0