| Cover | Dec. 10, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 10, 2024 |
| Entity File Number | 001-40555 |
| Entity Registrant Name | Thunder Bridge Capital Partners IV, Inc. |
| Entity Central Index Key | 0001843993 |
| Entity Tax Identification Number | 86-1826129 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 9912 Georgetown Pike |
| Entity Address, Address Line Two | Suite D203 |
| Entity Address, City or Town | Great Falls |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 22066 |
| City Area Code | 202 |
| Local Phone Number | 431-0507 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A Common Stock and one-fifth of one Redeemable Warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A Common Stock and one-fifth of one Redeemable Warrant |
| Trading Symbol | THCPU |
| Security Exchange Name | NASDAQ |
| Class A Common Stock, par value $0.0001 per share | |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | THCP |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share | |
| Title of 12(b) Security | Redeemable Warrants, each whole warrant exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share |
| Trading Symbol | THCPW |
| Security Exchange Name | NASDAQ |
