Segment Information - Earnings Before Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information
Net revenue	$ (7,445)	$ (8,509)	$ (15,001)	$ (17,041)
Total segment earnings from operations	182	451	638	923
Stock-based compensation expense	(126)	(103)	(278)	(230)
Amortization of intangible assets	(107)	(101)	(208)	(220)
Restructuring charges	(118)	(87)	(234)	(253)
Acquisition and other related charges	(51)	(43)	(95)	(80)
Separation costs	(141)	(91)	(226)	(170)
Interest and other, net	(85)	(52)	(163)	(126)
Tax indemnification adjustments	7	(69)	(11)	(54)
Loss from equity interests	(3)	0	(25)	0
Earnings from continuing operations before taxes	101	330	439	743
Operating segments
Segment Reporting Information
Net revenue	(7,800)	(8,893)	(15,669)	(17,807)
Total segment earnings from operations	769	1,053	1,760	2,177
Elimination of intersegment net revenue and other
Segment Reporting Information
Net revenue	(355)	(384)	(668)	(766)
Significant Reconciling Items
Segment Reporting Information
Corporate and unallocated costs and eliminations	(90)	(177)	(161)	(301)
Stock-based compensation expense	(96)	(103)	(219)	(230)
Amortization of intangible assets	(107)	(101)	(208)	(220)
Restructuring charges	(118)	(87)	(234)	(253)
Acquisition and other related charges	(51)	(43)	(95)	(80)
Separation costs	(141)	(91)	(226)	(170)
Defined benefit plan settlement charges and remeasurement benefit	16	0	21	0
Interest and other, net	(85)	(52)	(163)	(126)
Tax indemnification adjustments	7	(69)	(11)	(54)
Loss from equity interests	(3)	0	(25)	0
Enterprise Group
Segment Reporting Information
Net revenue	(5,943)	(6,870)	(12,041)	(13,752)
Enterprise Group \| Operating segments
Segment Reporting Information
Net revenue	(6,243)	(7,159)	(12,568)	(14,341)
Total segment earnings from operations	548	847	1,350	1,811
Enterprise Group \| Elimination of intersegment net revenue and other
Segment Reporting Information
Net revenue	(300)	(289)	(527)	(589)
Software
Segment Reporting Information
Net revenue	(637)	(703)	(1,291)	(1,423)
Software \| Operating segments
Segment Reporting Information
Net revenue	(685)	(774)	(1,406)	(1,554)
Total segment earnings from operations	181	192	335	328
Software \| Elimination of intersegment net revenue and other
Segment Reporting Information
Net revenue	(48)	(71)	(115)	(131)
Financial Services
Segment Reporting Information
Net revenue	(865)	(764)	(1,669)	(1,518)
Financial Services \| Operating segments
Segment Reporting Information
Net revenue	(872)	(788)	(1,695)	(1,564)
Total segment earnings from operations	78	73	156	173
Financial Services \| Elimination of intersegment net revenue and other
Segment Reporting Information
Net revenue	(7)	(24)	(26)	(46)
Corporate Investments
Segment Reporting Information
Net revenue	0	(172)	0	(348)
Corporate Investments \| Operating segments
Segment Reporting Information
Net revenue	0	(172)	0	(348)
Total segment earnings from operations	(38)	(59)	(81)	(135)
Corporate Investments \| Elimination of intersegment net revenue and other
Segment Reporting Information
Net revenue	$ 0	$ 0	$ 0	$ 0

Amount of reconciling item for corporate and unallocated costs, gains and eliminations.

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Represent company's expense associated with separation from former parent. The charges are related primarily to third-party consulting fees and other expenses incurred to complete the separation, such as: finance, IT, consulting and legal fees, real estate, and other items.

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Tax Indemnification Adjustments

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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