Cover Page - shares shares in Millions	9 Months Ended
	Oct. 31, 2020	Dec. 01, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 31, 2020
Document Transition Report	false
Entity File Number	001-32224
Entity Registrant Name	salesforce.com, inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3320693
Entity Address, Address Line One	Salesforce Tower
Entity Address, Address Line Two	415 Mission Street, 3rd Fl
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	901-7000
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	CRM
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		915
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001108524
Current Fiscal Year End Date	--01-31