Intangible Assets Acquired Through Business Combinations and Goodwill - Goodwill (Details) $ in Millions	9 Months Ended
Oct. 31, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 26,318
Other acquisitions and adjustments	76
Goodwill, ending balance	47,951
Slack
Goodwill [Roll Forward]
Goodwill acquired	21,220
Acumen
Goodwill [Roll Forward]
Goodwill acquired	$ 337

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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