Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jul. 31, 2020	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Stock-based expenses		$ 2,779	$ 2,190	$ 1,785
Discrete tax benefit	$ 2,000
Cost of revenues
Amortization of intangibles acquired through business combinations		897	662	440
Stock-based expenses		386	241	204
Research and development
Stock-based expenses		918	703	510
Marketing and sales
Amortization of intangibles acquired through business combinations		727	459	352
Stock-based expenses		1,104	941	852
General and administrative
Stock-based expenses		$ 371	$ 305	$ 219

Amortization Of Purchased Intangibles From Business Combinations

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- Definition

Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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- Definition

Amount of noncash expense for share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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