S-K 1602(a)(3) Forepart, Sponsor Compensation	Apr. 24, 2026 USD ($) $ / shares shares
Private Placement Units [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares	350,000
Price Paid or to be Paid for Securities, Total Amount \| $	$ 3,500,000
Class A ordinary share [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Per Share \| $ / shares	$ 11.5
Class B Ordinary Shares [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares	11,500,000
Underwriters [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares	1,500,000
Sponsor [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Total Amount \| $	$ 25,000
Churchill Sponsor XI LLC [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Price Paid or to be Paid for Securities, Per Share \| $ / shares	$ 10
Churchill Sponsor XI LLC [Member] \| Private Placement Units [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares	350,000
Price Paid or to be Paid for Securities, Total Amount \| $	$ 1,500,000
Churchill Sponsor XI LLC [Member] \| Class B Ordinary Shares [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares	11,500,000
Price Paid or to be Paid for Securities, Total Amount \| $	$ 25,000
Churchill Sponsor XI LLC [Member] \| Underwriters [Member]
SPAC Offering Forepart, Sponsor Compensation [Line Items]
Securities Issued or to be Issued, Shares	1,500,000