Business Combinations - Narrative (Details) $ in Millions				1 Months Ended							12 Months Ended
		Jul. 21, 2021 USD ($)	May 31, 2020 USD ($)	Feb. 28, 2021 USD ($)	Jun. 30, 2020 USD ($)	Feb. 29, 2020 USD ($)	Oct. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 USD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill, purchase accounting adjustments											$ 292
Fair value of equity awards assumed											205	$ 6	$ 373
Nonvested award, cost not yet recognized											$ 5,580
Estimated useful lives (in years)											5 years 6 months
Goodwill											$ 47,937	26,318	25,134
Loss on settlement of Salesforce.org reseller agreement	[1],[2]										$ 0	$ 0	$ 166
Developed technology
Business Acquisition [Line Items]
Estimated useful lives (in years)											3 years 8 months 12 days
Customer relationships
Business Acquisition [Line Items]
Estimated useful lives (in years)											6 years 7 months 6 days
Slack
Business Acquisition [Line Items]
Transaction costs		$ 54
Consideration transferred		27,068
Fair value of unvested options and restricted stock awards		1,700
Fair value of equity awards assumed		205
Nonvested award, cost not yet recognized		1,500
Finite-lived intangible assets acquired		6,350
Goodwill		21,161
Common stock issued		11,064
Cash		15,799
Intangible assets		6,350
Slack | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 2,360
Estimated useful lives (in years)		5 years
Slack | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 3,690
Estimated useful lives (in years)		8 years
Slack | Stock Options and Restricted Stock Units
Business Acquisition [Line Items]
Share conversion ratio		0.1885
Slack | Restricted stock
Business Acquisition [Line Items]
Share conversion ratio		0.1804
Acumen
Business Acquisition [Line Items]
Consideration transferred				$ 433
Goodwill				337
Acumen | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 99
Estimated useful lives (in years)				8 years
Vlocity
Business Acquisition [Line Items]
Share conversion ratio					0.05817
Fair value of unvested options and restricted stock awards					$ 139
Fair value of equity awards assumed					6
Finite-lived intangible assets acquired					473
Goodwill					1,024
Consideration transferred, including equity interest in acquiree held prior to combination					1,380
Assumed unvested options, allocated to future services					133
Fair value of pre-existing relationship			$ 167		208
Remeasurement gain					41
Cash					1,166
Intangible assets					473
Vlocity | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired					$ 174
Estimated useful lives (in years)					4 years
Vlocity | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired					$ 299
Estimated useful lives (in years)					8 years
Evergage
Business Acquisition [Line Items]
Consideration transferred						$ 100
Goodwill						74
Evergage | Developed technology and customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired						$ 25
Evergage | Developed technology and customer relationships | Minimum
Business Acquisition [Line Items]
Estimated useful lives (in years)						3 years
Evergage | Developed technology and customer relationships | Maximum
Business Acquisition [Line Items]
Estimated useful lives (in years)						5 years
Tableau
Business Acquisition [Line Items]
Consideration transferred								$ 14,800
Fair value of unvested options and restricted stock awards								1,500
Fair value of equity awards assumed								292
Goodwill								10,800
Assumed unvested options, allocated to future services								1,200
Common stock issued								14,600
Intangible assets								3,300
Tableau | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired								$ 2,000
Estimated useful lives (in years)								5 years
Tableau | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired								$ 1,200
Estimated useful lives (in years)								8 years
ClickSoftware
Business Acquisition [Line Items]
Fair value of equity awards assumed							$ 81
Goodwill							1,100
Consideration transferred, including equity interest in acquiree held prior to combination							1,400
Common stock issued							663
Cash							587
Intangible assets							276
ClickSoftware | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired							$ 215
Estimated useful lives (in years)							4 years
ClickSoftware | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired							$ 61
Estimated useful lives (in years)							8 years
Salesforce.org
Business Acquisition [Line Items]
Goodwill									$ 164
Cash									300
Loss on settlement of Salesforce.org reseller agreement									$ 166
MapAnything, Inc.
Business Acquisition [Line Items]
Consideration transferred										$ 213

[1] Amounts include amortization of intangible assets acquired through business combinations, as follows: Fiscal Year Ended January 31,202220212020Cost of revenues$897 $662 $440 Marketing and sales727 459 352 

[2] Amounts include stock-based expense, as follows:  Fiscal Year Ended January 31, 202220212020Cost of revenues$386 $241 $204 Research and development918 703 510 Marketing and sales1,104 941 852 General and administrative371 305 219