Fair Value Measurements (Details) - Fair value, measurements, recurring [Member] - USD ($) $ in Millions	Jan. 31, 2016	Oct. 25, 2015
Assets:
Total	$ 2,193	$ 4,823
Money market funds [Member]
Assets:
Investment securities	856	3,272
U.S. Treasury and agency securities [Member]
Assets:
Investment securities	101	84
Non-US government securities [Member]
Assets:
Investment securities	19	69
Municipal securities [Member]
Assets:
Investment securities	481	459
Commercial paper, corporate bonds and medium-term notes [Member]
Assets:
Investment securities	411	632
Asset-backed and mortgage-backed securities [Member]
Assets:
Investment securities	274	262
Publicly traded equity securities [Member]
Assets:
Investment securities	51	45
Level 1 [Member]
Assets:
Total	990	3,389
Level 1 [Member] | Money market funds [Member]
Assets:
Investment securities	856	3,272
Level 1 [Member] | U.S. Treasury and agency securities [Member]
Assets:
Investment securities	83	72
Level 1 [Member] | Non-US government securities [Member]
Assets:
Investment securities	0	0
Level 1 [Member] | Municipal securities [Member]
Assets:
Investment securities	0	0
Level 1 [Member] | Commercial paper, corporate bonds and medium-term notes [Member]
Assets:
Investment securities	0	0
Level 1 [Member] | Asset-backed and mortgage-backed securities [Member]
Assets:
Investment securities	0	0
Level 1 [Member] | Publicly traded equity securities [Member]
Assets:
Investment securities	51	45
Level 2 [Member]
Assets:
Total	1,203	1,434
Level 2 [Member] | Money market funds [Member]
Assets:
Investment securities	0	0
Level 2 [Member] | U.S. Treasury and agency securities [Member]
Assets:
Investment securities	18	12
Level 2 [Member] | Non-US government securities [Member]
Assets:
Investment securities	19	69
Level 2 [Member] | Municipal securities [Member]
Assets:
Investment securities	481	459
Level 2 [Member] | Commercial paper, corporate bonds and medium-term notes [Member]
Assets:
Investment securities	411	632
Level 2 [Member] | Asset-backed and mortgage-backed securities [Member]
Assets:
Investment securities	274	262
Level 2 [Member] | Publicly traded equity securities [Member]
Assets:
Investment securities	$ 0	$ 0