Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2025	Apr. 15, 2026	Jun. 30, 2025
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	001-42609
Entity Registrant Name	Texas Ventures Acquisition III Corp
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1802457
Entity Address, Address Line One	1012 Springfield Avenue
Entity Address, City or Town	Mountainside
Entity Address State Or Province	NJ
Entity Address, Postal Zip Code	07092
City Area Code	201
Local Phone Number	985-8300
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
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	true
Entity Public Float			$ 229,980,031.83
Auditor Name	WithumSmith+Brown, PC
Auditor Location	New York, New York
Auditor Firm ID	100
Entity Central Index Key	0002033991
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Units, each consisting of one Class A ordinary share, $0.0001 par value per share, and one-half of one redeemable warrant
Document and Entity Information
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value per share, and one-half of one redeemable warrant
Trading Symbol	TVACU
Security Exchange Name	NASDAQ
Class A ordinary shares, $0.0001 par value per share
Document and Entity Information
Title of 12(b) Security	Class A ordinary shares, $0.0001 par value per share
Trading Symbol	TVA
Security Exchange Name	NASDAQ
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Document and Entity Information
Title of 12(b) Security	Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Trading Symbol	TVACW
Security Exchange Name	NASDAQ
Class A ordinary shares
Document and Entity Information
Entity Common Stock, Shares Outstanding		22,500,000
Class B ordinary shares
Document and Entity Information
Entity Common Stock, Shares Outstanding		7,500,000

Texas Ventures Acquisition III Corp 10-K