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Business Combinations (Intangible Assets Acquired) (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	May 31, 2018	Apr. 30, 2018	Jan. 31, 2020
Business Acquisition [Line Items]
Useful Life					5 years 3 months 18 days
Developed technology
Business Acquisition [Line Items]
Useful Life					4 years 1 month 6 days
Customer relationships
Business Acquisition [Line Items]
Useful Life					6 years 6 months
Other purchased intangible assets
Business Acquisition [Line Items]
Useful Life					10 months 24 days
Tableau Software, Inc.
Business Acquisition [Line Items]
Fair Value	$ 3,252
Tableau Software, Inc. \| Developed technology
Business Acquisition [Line Items]
Fair Value	$ 2,000
Useful Life	5 years
Tableau Software, Inc. \| Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 1,231
Useful Life	8 years
Tableau Software, Inc. \| Other purchased intangible assets
Business Acquisition [Line Items]
Fair Value	$ 21
Useful Life	1 year
ClickSoftware Technologies Ltd.
Business Acquisition [Line Items]
Fair Value	$ 276
ClickSoftware Technologies Ltd. \| Developed technology
Business Acquisition [Line Items]
Fair Value	$ 215
Useful Life	4 years
ClickSoftware Technologies Ltd. \| Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 61
Useful Life	8 years
Datorama
Business Acquisition [Line Items]
Fair Value		$ 202
Datorama \| Developed technology
Business Acquisition [Line Items]
Fair Value		$ 159
Useful Life		4 years
Datorama \| Customer relationships
Business Acquisition [Line Items]
Fair Value		$ 42
Useful Life		8 years
Datorama \| Other purchased intangible assets
Business Acquisition [Line Items]
Fair Value		$ 1
Useful Life		1 year
MuleSoft
Business Acquisition [Line Items]
Fair Value			$ 1,279
MuleSoft \| Developed technology
Business Acquisition [Line Items]
Fair Value			$ 224
Useful Life			4 years
MuleSoft \| Customer relationships
Business Acquisition [Line Items]
Fair Value			$ 1,046
Useful Life			8 years
MuleSoft \| Other purchased intangible assets
Business Acquisition [Line Items]
Fair Value			$ 9
Useful Life			1 year
CloudCraze \| Developed technology
Business Acquisition [Line Items]
Fair Value				$ 58
CloudCraze \| Customer relationships
Business Acquisition [Line Items]
Fair Value				$ 58