| Document and Entity Information | Nov. 17, 2021 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001820302 |
| Document Type | 8-K |
| Document Period End Date | Nov. 17, 2021 |
| Entity Registrant Name | Bakkt Holdings, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39544 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Class 160 A Common Stock Par Value 0.0001 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | BKKT |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants to purchase Class A Common Stock |
| Trading Symbol | BKKT WS |
| Security Exchange Name | NYSE |
