Stockholders' Equity (Details 2) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014	May 31, 2016	May 24, 2016	Nov. 30, 2015	Oct. 13, 2015
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	$ (5,015,000,000)
Other comprehensive (loss) income before reclassifications	(1,657,000,000)
Reclassifications of (gains) losses into earnings	73,000,000
Balance at end of period	$ (6,599,000,000)	$ (5,015,000,000)
Dividends
Cash dividends declared per share (in dollars per share)	$ 0.22	$ 0.00	$ 0.00
Stock Repurchase Program
Stock repurchase program authorized amount							$ 3,000,000,000.00
Share Repurchase Program
Stock Repurchase Program
Stock repurchase program authorized amount					$ 3,000,000,000.0
Retired (shares)	158
Remaining authorization	$ 3,300,000,000
Accelerated Share Repurchase Agreement
Stock Repurchase Program
Payment				$ 1,450,000,000		$ 1,075,000,000
Total repurchases of common stock (shares)	148
Repurchased	$ 2,700,000,000
Net unrealized gains (losses) on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	55,000,000
Other comprehensive (loss) income before reclassifications	(2,000,000)	$ (8,000,000)	$ 4,000,000
Reclassifications of (gains) losses into earnings	1,000,000
Balance at end of period	54,000,000	55,000,000
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	68,000,000
Other comprehensive (loss) income before reclassifications	212,000,000	412,000,000	$ 79,000,000
Reclassifications of (gains) losses into earnings	(245,000,000)
Balance at end of period	35,000,000	68,000,000
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(4,173,000,000)
Other comprehensive (loss) income before reclassifications	(1,733,000,000)
Reclassifications of (gains) losses into earnings	264,000,000
Balance at end of period	(5,642,000,000)	(4,173,000,000)
Cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at beginning of period	(965,000,000)
Other comprehensive (loss) income before reclassifications	(134,000,000)
Reclassifications of (gains) losses into earnings	53,000,000
Balance at end of period	$ (1,046,000,000)	$ (965,000,000)