Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions	9 Months Ended
	Jul. 31, 2017	May 24, 2016	Oct. 13, 2015
Share Repurchase program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount		$ 3,000,000,000.0	$ 3,000,000,000.0
Common stock retired (in shares)	1.6
Repurchases of common stock recorded as a reduction to stockholders' equity	$ 29,000,000
Share repurchase authorization remaining	$ 1,400,000,000
ASR Agreement
Equity, Class of Treasury Stock [Line Items]
Common stock retired (in shares)	94.0
Repurchases of common stock recorded as a reduction to stockholders' equity	$ 1,900,000,000