S-K 1602(b)(6) Prospectus Summary, Sponsor Compensation	Apr. 24, 2026 USD ($) $ / shares shares
M. Klein & Associates [Member] \| Administrative Services [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 30,000
Churchill Sponsor XI LLC [Member] \| Class B Ordinary Shares [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 25,000
Securities Issued or to be Issued, Shares (in Shares) \| shares	11,500,000
Churchill Sponsor XI LLC [Member] \| Underwriters [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares (in Shares) \| shares	1,500,000
Churchill Sponsor XI LLC [Member] \| Private Placement Units [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 1,500,000
Securities Issued or to be Issued, Shares (in Shares) \| shares	350,000
Churchill Sponsor XI LLC [Member] \| Private Placement Warrants [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 3,500,000
Churchill Sponsor XI LLC [Member] \| Loan [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount	$ 600,000
Churchill Sponsor XI LLC [Member] \| Working Capital Loans [Member]
SPAC Prospectus Summary, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Per Share (in Dollars per share) \| $ / shares	$ 10