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Stock-based Compensation (Employee Stock Purchase Plan) (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2021 USD ($) $ / shares shares
ESPP Disclosures [Line Items]
Number of employee stock purchase plans	2
Purchase price of shares under ESPP in relation to FMV of stock	85.00%
Purchase period	6 months
Shares purchased	1
Employee stock purchase plan (ESPP), weighted average purchase price of shares purchased | $ / shares	$ 219.49
Employee stock purchase plan (ESPP), cash contributions to ESPP | $	$ 21
Non U.S. ESPP Plan
ESPP Disclosures [Line Items]
Shares available for future grants	19
U.S. ESPP Plan
ESPP Disclosures [Line Items]
Shares available for future grants	17

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- Definition

Represents the amount of cash contributed during the period by employees to the ESPP.

+ References

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- Definition

Employee Stock Purchase Plan (ESPP), Weighted Average Purchase Price of Shares Purchased

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- Definition

Number of Employee Stock Purchase Plans ("ESPPs").

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- Definition

Percentage the purchase price of shares under the ESPPs is equal to the stock's fair market value.

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- Definition

Purchase period of Employee Stock Purchase Plans.

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- Definition

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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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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