S-K 1603(a)(9) Restrictions on Selling Securities	Dec. 10, 2025
Founder Shares [Member]
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block]	The earlier of (i) six months following the consummation of our initial business combination; or (ii) subsequent to the consummation of our initial business combination, the date on which we consummate a transaction which results in all of our shareholders having the right to exchange their shares for cash, securities, or other property subject to certain limited exceptions.
SPAC Sponsor, Persons and Entities Subject to Restrictions	Churchill Sponsor XI LLC Michael Klein Jay Taragin William Sherman
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Transfers permitted (a) to our officers or directors, any affiliates or family members of any of our officers or directors, any members of our sponsor or their affiliates, or any affiliates of our sponsor, (b) in the case of an individual, transfers by gift to members of the individual’s immediate family or to a trust, the beneficiary of which is a member of one of the individual’s immediate family, an affiliate of such person or to a charitable organization; (c) in the case of an individual, transfers by virtue of laws of descent and distribution upon death of the individual; (d) in the case of an individual, transfers pursuant to a qualified domestic relations order; (e) transfers by virtue of the laws of our sponsor’s operating agreement upon dissolution of our sponsor; and (f) transfers by private sales or transfers made in connection with the consummation of a business combination at prices no greater than the price at which the securities were originally purchased.
Private Placement Units [Member]
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block]	30 days after the completion of our initial business combination
SPAC Sponsor, Persons and Entities Subject to Restrictions	Churchill Sponsor XI LLC
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	Same as above
Any units, warrants, ordinary shares or any other securities convertible into, or exercisable, or exchangeable for, ordinary shares [Member]
SPAC Sponsor and Affiliates Information, Restrictions on Sale of SPAC Securities [Line Items]
SPAC Sponsor, Description of Expiration Dates of Restrictions [Text Block]	180 days after the date of this prospectus
SPAC Sponsor, Persons and Entities Subject to Restrictions	Churchill Sponsor XI LLC Michael Klein Jay Taragin William Sherman
SPAC Sponsor, Description of Exceptions to Restrictions [Text Block]	No transfer without the prior written consent of Citigroup Global Markets Inc., provided, however that we may (1) issue and sell the private placement units; (2) issue and sell the additional units to cover our underwriter’s overallotment option (if any); (3) register with the SEC pursuant to an agreement to be entered into concurrently with the issuance and sale of the securities in this offering, the resale of the private placement units and the Class A ordinary shares issuable upon exercise of the warrants and the founder shares; and (4) issue securities in connection with our initial business combination. However, the foregoing shall not apply to the forfeiture of any founder shares pursuant to their terms or any transfer of founder shares to any current or future independent director of the company (as long as such current or future independent director is subject to the terms of the letter agreement, filed herewith, at the time of such transfer; and as long as, to the extent any Section 16 reporting obligation is triggered as a result of such transfer, any related Section 16 filing includes a practical explanation as to the nature of the transfer).

Churchill Capital Corp XI S-1/A