Stockholders' Equity - Components of AOCI (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	May 31, 2016	May 24, 2016	Nov. 30, 2015	Oct. 13, 2015
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period			$ (5,015,000,000)
Other comprehensive income (loss) before reclassifications			75,000,000
Reclassifications of losses (gains) into earnings			(237,000,000)
Balance at end of period	$ (5,177,000,000)		$ (5,177,000,000)
Share Repurchase program
Stock Repurchase Program
Common stock retired (in shares)			155
Share repurchase authorization remaining	3,300,000,000		$ 3,300,000,000
Stock repurchase program authorized amount						$ 3,000,000,000.0		$ 3,000,000,000.0
ASR Agreement
Stock Repurchase Program
Total repurchases of common stock under ASR Agreement (in shares)			144
Repurchases of common stock recorded as a reduction to stockholders' equity			$ 2,700,000,000
Payments for repurchase					$ 1,500,000,000		$ 1,100,000,000
Change in net unrealized gains (losses) on available-for-sale securities:
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period			55,000,000
Other comprehensive income (loss) before reclassifications	7,000,000	$ 1,000,000	10,000,000	$ (4,000,000)
Reclassifications of losses (gains) into earnings	1,000,000	0	(1,000,000)	0
Balance at end of period	66,000,000		66,000,000
Change in net unrealized gains (losses) on cash flow hedges:
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period			68,000,000
Other comprehensive income (loss) before reclassifications	149,000,000	$ 151,000,000	116,000,000	$ 351,000,000
Reclassifications of losses (gains) into earnings			(191,000,000)
Balance at end of period	(7,000,000)		(7,000,000)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period			(4,173,000,000)
Other comprehensive income (loss) before reclassifications			199,000,000
Reclassifications of losses (gains) into earnings			(47,000,000)
Balance at end of period	(4,021,000,000)		(4,021,000,000)
Change in cumulative translation adjustment
Components of accumulated other comprehensive loss, net of taxes
Balance at beginning of period			(965,000,000)
Other comprehensive income (loss) before reclassifications			(250,000,000)
Reclassifications of losses (gains) into earnings			0
Balance at end of period	$ (1,215,000,000)		$ (1,215,000,000)