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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Jun. 30, 2021
Aug. 23, 2021
Dec. 31, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name BILL.COM HOLDINGS, INC.    
Entity Central Index Key 0001786352    
Current Fiscal Year End Date --06-30    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 10.7
Entity Common Stock, Shares Outstanding   94,782,906  
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Shell Company false    
Entity File Number 001-39149    
Entity Tax Identification Number 83-2661725    
Entity Address, Address Line One 6220 America Center Drive, Suite 100    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
City Area Code 650    
Local Phone Number 621-7700    
Entity Address, Postal Zip Code 95022    
Entity Interactive Data Current Yes    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Title of 12(b) Security Common Stock, $0.00001 par value    
Security Exchange Name NYSE    
Trading Symbol BILL    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for its 2021 Annual Meeting of Stockholders, or Proxy Statement, to be filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, are incorporated by reference in Part III. Except with respect to information specifically incorporated by reference in this Annual Report, the Proxy Statement shall not be deemed to be filed as part hereof.