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Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2025
Mar. 12, 2026
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus FY  
Entity Registrant Name Apollo Origination II (UL) Capital Trust  
Entity Central Index Key 0002052153  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Well-known Seasoned Issuer No  
Document Financial Statement Error Correction [Flag] false  
Entity Voluntary Filers No  
Current Fiscal Year End Date --12-31  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Securities Act File Number 000-56723  
Entity Tax Identification Number 36-6481177  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 9 West 57 Street  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10019  
City Area Code 212  
Local Phone Number 515-3200  
Document Annual Report true  
Document Transition Report false  
Entity Common Stock, Shares Outstanding   26,342,276
Auditor Opinion [Text Block] Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying consolidated statements of assets and liabilities of Apollo Origination II (UL) Capital Trust and subsidiaries (the "Company") as of December 31, 2025 and 2024, including the consolidated schedule of investments, as of December 31, 2025, the related consolidated statements of operations, cash flows, and changes in net assets for the year ended December 31, 2025 and the period from June 26, 2024 (Inception) through December 31, 2024, the financial highlights for the period from January 24, 2025 through December 31, 2025, and the related notes (collectively referred to as the ”financial statements and financial highlights”). In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations, cash flows, and changes in net assets for the year ended December 31, 2025 and the period from June 26, 2024 (Inception) through December 31, 2024, and the financial highlights for the period from January 24, 2025 through December 31, 2025 in conformity with accounting principles generally accepted in the United States of America.

  
Auditor Name Deloitte & Touche LLP  
Auditor Location New York  
ICFR Auditor Attestation Flag false  
Auditor Firm ID 34