Business Combinations (Pro Forma Information) (Details) - Tableau Software, Inc. - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Business Acquisition [Line Items]
Total revenues	$ 327
Pretax loss	(251)
Total revenues	4,513	$ 3,637	$ 12,748	$ 10,367
Pretax income (loss)	(20)	(130)	88	(73)
Net income (loss)	$ (27)	$ (175)	$ 52	$ (1)

Business Combination, Pro Forma Information, Pretax Earnings or 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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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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