Stockholders' Equity-Reclassifications (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015	Oct. 31, 2015
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Common Stock, Dividends, Per Share, Declared			$ 0.25	$ 0.32
Repurchases of common stock (in shares)	28.0	18.0	96.0	54.0
Payment in connection with repurchases of shares	$ 300	$ 600	$ 1,102	$ 2,230
Share repurchases that will be settled in subsequent period	0.7
Share repurchase authorization remaining	$ 900		900
Share repurchase authorization increase after balance sheet date			10,000
Tax (provision) benefit on unrealized gains (losses) arising during the period	53	198	69	19
Net change	(4,504)		(4,504)		$ (6,302)
Net revenue	11,588	12,977	23,834	26,835
Cost of Revenue	9,338	10,415	19,299	21,588
Interest and other, net	(5)	(78)	(99)	(199)
Earnings from continuing operations before taxes	836	919	1,670	1,916
Total	(62)	(556)	(96)	(890)
Other comprehensive loss, net of taxes	(144)	(327)	(45)	(121)
Reclassifications of losses (gains) into earnings
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Other comprehensive loss, net of taxes	(144)	(327)	(45)	(121)
Change in unrealized gains (losses) on available-for-sale securities
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax benefit (provision) on unrealized (losses) gains arising during the period		18		3
Other comprehensive (losses) income before reclassifications	1	(41)	1	(10)
Change in unrealized (losses) gains on cash flow hedges
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax benefit (provision) on unrealized (losses) gains arising during the period	40	20	51	(181)
Tax provision (benefit) on (gains) losses	15	157	23	255
Tax (provision) benefit on unrealized gains (losses) arising during the period	55	177	74	74
Other comprehensive (losses) income before reclassifications	(105)	2	11	432
(Gains) losses reclassified into earnings	(47)	(399)	(73)	(635)
Net change in unrealized (losses) gains on derivatives qualifying as hedges	(152)	(397)	(62)	(203)
Change in unrealized (losses) gains on cash flow hedges | Reclassifications of losses (gains) into earnings
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Net revenue	(88)	(410)	(166)	(665)
Cost of Revenue	32	44	72	72
Operating expenses		1		2
Interest and other, net	(6)		(2)
Earnings from continuing operations before taxes	(62)	(365)	(96)	(591)
Discontinued of Operations		(191)		(299)
Total	(62)	(556)	(96)	(890)
Change in unrealized components of defined benefit plans
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period	(2)		(5)	(14)
Net change in unrealized gains (losses) on benefit plans	7	108	16	204
Gains (losses) arising during the period
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period	2		2
Losses (gains) adjustments reclassified into earnings	(2)		(2)
Amortization of actuarial loss and prior service benefit
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax provision (benefit) on (gains) losses	(3)	1	(6)	(13)
Losses (gains) adjustments reclassified into earnings	9	105	18	203
Settlements and other
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period	$ (1)	(1)	$ (1)	(1)
Net change in unrealized gains (losses) on other adjustments		3		1
Change in cumulative translation adjustment
Changes and reclassifications related to Other Comprehensive (Loss) Income, net of taxes
Tax (provision) benefit on unrealized gains (losses) arising during the period		3		(44)
Net change in unrealized gains (losses) in translation adjustment		$ 3		$ (112)