Stockholders' Equity (Details 2) - USD ($) $ / shares in Units, shares in Millions			12 Months Ended
	Feb. 23, 2019	Feb. 22, 2019	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Feb. 21, 2018	Oct. 16, 2017	May 24, 2016	Oct. 13, 2015
Components of accumulated other comprehensive income, net of taxes
Balance			$ 21,274,000,000	$ 23,505,000,000	$ 31,518,000,000
Balance			$ 17,149,000,000	$ 21,274,000,000	$ 23,505,000,000
Dividends
Cash dividends declared per share (in dollars per share)	$ 0.12	$ 0.1125	$ 0.4575	$ 0.4875	$ 0.26
Stock Repurchase Program
Stock repurchase program authorized amount									$ 3,000,000,000.0
Remaining authorization			$ 2,500,000,000	$ 4,700,000,000
Share Repurchase Program
Stock Repurchase Program
Stock repurchase program authorized amount						$ 2,500,000,000	$ 5,000,000,000.0	$ 3,000,000,000.0
Retired (shares)			150.0	222.0
Open market repurchases (shares)			0.5	2.4	1.7
Accelerated Share Repurchase Agreement
Stock Repurchase Program
Repurchased			$ 2,200,000,000	$ 3,600,000,000
Net unrealized gains (losses) on available-for-sale securities
Components of accumulated other comprehensive income, net of taxes
Balance			17,000,000
Other comprehensive income (loss) before reclassifications			9,000,000	(3,000,000)	$ (10,000,000)
Reclassifications of (gains) losses into earnings			(3,000,000)	(9,000,000)	(3,000,000)
Balance			23,000,000	17,000,000
Net unrealized gains (losses) on cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance			106,000,000
Other comprehensive income (loss) before reclassifications			275,000,000	147,000,000	52,000,000
Reclassifications of (gains) losses into earnings			(328,000,000)	7,000,000	(135,000,000)
Balance			53,000,000	106,000,000
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance			(2,922,000,000)
Other comprehensive income (loss) before reclassifications			(661,000,000)
Reclassifications of (gains) losses into earnings			217,000,000
Balance			(3,366,000,000)	(2,922,000,000)
Cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance			(419,000,000)
Other comprehensive income (loss) before reclassifications			(18,000,000)	(67,000,000)	(15,000,000)
Reclassifications of (gains) losses into earnings			0
Balance			(437,000,000)	(419,000,000)
Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive income, net of taxes
Balance			(3,218,000,000)	(2,895,000,000)	(6,599,000,000)
Other comprehensive income (loss) before reclassifications			(395,000,000)
Reclassifications of (gains) losses into earnings			(114,000,000)
Balance			$ (3,727,000,000)	$ (3,218,000,000)	$ (2,895,000,000)