Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 25, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-39544
Entity Registrant Name	Bakkt Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1550750
Entity Address, Address Line One	10000 Avalon Boulevard
Entity Address, Address Line Two	Suite 1000
Entity Address, City or Town	Alpharetta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30009
City Area Code	678
Local Phone Number	534-5849
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 207.6
Documents Incorporated by Reference	Portions of the registrant’s Definitive Proxy Statement relating to the 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2021.
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Entity Central Index Key	0001820302
Common Class A
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	BKKT
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding (in shares)		57,164,488
Warrants
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase Class A Common Stock
Trading Symbol	BKKT WS
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding (in shares)		7,140,929
Common Class V
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		206,003,270