Fair Value Measurements - Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Jan. 26, 2020	Oct. 27, 2019
Assets:
Equity investments with readily determinable values	$ 156	$ 157
U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	332	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	703	647
Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	652	635
Publicly traded equity securities
Assets:
Equity investments with readily determinable values	44	45
Recurring fair value measurements
Assets:
Available-for-sale debt security investments	4,147	4,093
Equity investments with readily determinable values	44	45
Total	4,191	4,138
Recurring fair value measurements | Money market funds
Assets:
Available-for-sale debt security investments	1,644	1,677
Recurring fair value measurements | U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	334	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	403	406
Recurring fair value measurements | Commercial paper, corporate bonds and medium-term notes
Assets:
Available-for-sale debt security investments	1,110	1,024
Recurring fair value measurements | Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	652	635
Recurring fair value measurements | Publicly traded equity securities
Assets:
Equity investments with readily determinable values	44	45
Recurring fair value measurements | Level 1
Assets:
Available-for-sale debt security investments	1,962	2,000
Equity investments with readily determinable values	44	45
Total	2,006	2,045
Recurring fair value measurements | Level 1 | Money market funds
Assets:
Available-for-sale debt security investments	1,644	1,677
Recurring fair value measurements | Level 1 | U.S. Treasury and agency securities
Assets:
Available-for-sale debt security investments	318	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
Assets:
Equity investments with readily determinable values	44	45
Recurring fair value measurements | Level 2
Assets:
Available-for-sale debt security investments	2,185	2,093
Equity investments with readily determinable values	0	0
Total	2,185	2,093
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	16	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	403	406
Recurring fair value measurements | Level 2 | Commercial paper, corporate bonds and medium-term notes
Assets:
Available-for-sale debt security investments	1,110	1,024
Recurring fair value measurements | Level 2 | Asset-backed and mortgage-backed securities
Assets:
Available-for-sale debt security investments	652	635
Recurring fair value measurements | Level 2 | Publicly traded equity securities
Assets:
Equity investments with readily determinable values	$ 0	$ 0