Fair Value Measurements (Details) - USD ($) $ in Millions	Jul. 29, 2018	Oct. 29, 2017
Assets:
Investment securities	$ 2,223	$ 3,409
Recurring fair value measurements
Assets:
Investment securities	4,151	6,999
Recurring fair value measurements | Money market funds
Assets:
Investment securities	1,596	2,658
Recurring fair value measurements | U.S. Treasury and agency securities
Assets:
Investment securities	334	681
Recurring fair value measurements | Non-U.S. government securities
Assets:
Investment securities	12	216
Recurring fair value measurements | Municipal securities
Assets:
Investment securities	534	1,348
Recurring fair value measurements | Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	1,011	1,619
Recurring fair value measurements | Asset-backed and mortgage-backed securities
Assets:
Investment securities	583	378
Recurring fair value measurements | Publicly traded equity securities
Assets:
Investment securities	81	99
Recurring fair value measurements | Level 1
Assets:
Investment securities	1,980	2,949
Recurring fair value measurements | Level 1 | Money market funds
Assets:
Investment securities	1,596	2,658
Recurring fair value measurements | Level 1 | U.S. Treasury and agency securities
Assets:
Investment securities	303	192
Recurring fair value measurements | Level 1 | Non-U.S. government securities
Assets:
Investment securities	0	0
Recurring fair value measurements | Level 1 | Municipal securities
Assets:
Investment securities	0	0
Recurring fair value measurements | Level 1 | Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	0	0
Recurring fair value measurements | Level 1 | Asset-backed and mortgage-backed securities
Assets:
Investment securities	0	0
Recurring fair value measurements | Level 1 | Publicly traded equity securities
Assets:
Investment securities	81	99
Recurring fair value measurements | Level 2
Assets:
Investment securities	2,171	4,050
Recurring fair value measurements | Level 2 | Money market funds
Assets:
Investment securities	0	0
Recurring fair value measurements | Level 2 | U.S. Treasury and agency securities
Assets:
Investment securities	31	489
Recurring fair value measurements | Level 2 | Non-U.S. government securities
Assets:
Investment securities	12	216
Recurring fair value measurements | Level 2 | Municipal securities
Assets:
Investment securities	534	1,348
Recurring fair value measurements | Level 2 | Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	1,011	1,619
Recurring fair value measurements | Level 2 | Asset-backed and mortgage-backed securities
Assets:
Investment securities	583	378
Recurring fair value measurements | Level 2 | Publicly traded equity securities
Assets:
Investment securities	$ 0	$ 0