Fair Value Measurements (Details) - Recurring fair value measurements - USD ($) $ in Millions	Apr. 30, 2017	Oct. 30, 2016
Assets:
Investment securities	$ 6,442	$ 3,505
Money market funds
Assets:
Investment securities	2,637	1,889
U.S. Treasury and agency securities
Assets:
Investment securities	535	205
Non-U.S. government securities
Assets:
Investment securities	162	15
Municipal securities
Assets:
Investment securities	1,041	661
Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	1,687	415
Asset-backed and mortgage-backed securities
Assets:
Investment securities	293	253
Publicly traded equity securities
Assets:
Investment securities	87	67
Level 1
Assets:
Investment securities	2,782	2,063
Level 1 | Money market funds
Assets:
Investment securities	2,637	1,889
Level 1 | U.S. Treasury and agency securities
Assets:
Investment securities	58	107
Level 1 | Non-U.S. government securities
Assets:
Investment securities	0	0
Level 1 | Municipal securities
Assets:
Investment securities	0	0
Level 1 | Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	0	0
Level 1 | Asset-backed and mortgage-backed securities
Assets:
Investment securities	0	0
Level 1 | Publicly traded equity securities
Assets:
Investment securities	87	67
Level 2
Assets:
Investment securities	3,660	1,442
Level 2 | Money market funds
Assets:
Investment securities	0	0
Level 2 | U.S. Treasury and agency securities
Assets:
Investment securities	477	98
Level 2 | Non-U.S. government securities
Assets:
Investment securities	162	15
Level 2 | Municipal securities
Assets:
Investment securities	1,041	661
Level 2 | Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	1,687	415
Level 2 | Asset-backed and mortgage-backed securities
Assets:
Investment securities	293	253
Level 2 | Publicly traded equity securities
Assets:
Investment securities	$ 0	$ 0