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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Overview and Basis of Presentation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	May 16, 2019	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Net loss from discontinued operations		$ 0	$ 72	$ 0	$ 118
Change in restricted cash					$ 11
Increase of revenue in period		10		18
Accounting Standards Update 2016-16
Segment Reporting Information [Line Items]
Effects of adoption of accounting standard updates		$ 2,300		$ 2,300
Minimum
Segment Reporting Information [Line Items]
Capitalized contract cost amortization period		3 years		3 years
Maximum
Segment Reporting Information [Line Items]
Capitalized contract cost amortization period		6 years		6 years
Subsequent Event \| Cray Inc.
Segment Reporting Information [Line Items]
Share price paid (in usd per share)	$ 35
Consideration transferred	$ 1,300