Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Oct. 25, 2015	Oct. 26, 2014
Assets:
Foreign exchange derivative assets	$ 2	$ 52
Total assets	4,825	3,575
Money market funds
Assets:
Investment securities	3,272	2,494
U.S. Treasury and agency securities
Assets:
Investment securities	84	62
Non-U.S. government securities
Assets:
Investment securities	69	14
Municipal securities
Assets:
Investment securities	459	393
Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	632	224
Asset-backed and mortgage-backed securities
Assets:
Investment securities	262	286
Publicly traded equity securities
Assets:
Investment securities	45	50
Level 1
Assets:
Foreign exchange derivative assets	0	0
Total assets	3,389	2,587
Level 1 | Money market funds
Assets:
Investment securities	3,272	2,494
Level 1 | U.S. Treasury and agency securities
Assets:
Investment securities	72	43
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	45	50
Level 2
Assets:
Foreign exchange derivative assets	2	52
Total assets	1,436	988
Level 2 | Money market funds
Assets:
Investment securities	0	0
Level 2 | U.S. Treasury and agency securities
Assets:
Investment securities	12	19
Level 2 | Non-U.S. government securities
Assets:
Investment securities	69	14
Level 2 | Municipal securities
Assets:
Investment securities	459	393
Level 2 | Commercial paper, corporate bonds and medium-term notes
Assets:
Investment securities	632	224
Level 2 | Asset-backed and mortgage-backed securities
Assets:
Investment securities	262	286
Level 2 | Publicly traded equity securities
Assets:
Investment securities	$ 0	$ 0