Organization and Business Operations (Details) - USD ($)		3 Months Ended
	Apr. 29, 2026	Mar. 31, 2026	Dec. 31, 2025
Organization and Business Operations [Line Items]
Incorporated date		Sep. 30, 2025
Transaction costs		$ 19,105,852
Cash underwriting fee		1,500,000
Underwriter’s reimbursement		4,710,000
Deferred fee		16,990,000
Other offering costs		$ 615,852
Number of maturity days		185 days
Redemption percentage		100.00%
Percentage of fair market value		80.00%
Post business combination percentage		50.00%
Advance received for working capital		$ 1,000,000
Annual limitation		1,000,000
Maximum net interest to pay dissolution expenses		$ 100,000
Public Warrant [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of units (in Shares)	1
Private Placement [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Gross proceeds	$ 3,500,000
Private Placement Units” and together with the Public Units [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of units (in Shares)	1
Warrant [Member]
Organization and Business Operations [Line Items]
Price per share (in Dollars per share)	$ 11.5
Public Units [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of shares issued (in Shares)	41,400,000
Share issued per share (in Dollars per share)	$ 10
Option Units [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of shares issued (in Shares)	5,400,000
Share issued per share (in Dollars per share)	$ 10
Initial Public Offering [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Share issued per share (in Dollars per share)	$ 10
Gross proceeds	$ 414,000,000
Net proceeds of the sale of the public units	$ 414,000,000
Private Placement Units” and together with the Public Units [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of shares issued (in Shares)	350,000
Share issued per share (in Dollars per share)	$ 10
Class A Ordinary Share [Member]
Organization and Business Operations [Line Items]
Number of units (in Shares)		1
Ordinary share, par value (in Dollars per share)		$ 0.0001	$ 0.0001
Class A Ordinary Share [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Share issued per share (in Dollars per share)	$ 11.5
Number of units (in Shares)	1
Ordinary share, par value (in Dollars per share)	$ 0.0001
Class A Ordinary Share [Member] \| Warrant [Member]
Organization and Business Operations [Line Items]
Share issued per share (in Dollars per share)		$ 11.5
Class A Ordinary Share [Member] \| Warrant [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of units (in Shares)	1
Class A Ordinary Share [Member] \| Private Placement Shares [Member] \| Subsequent Event [Member]
Organization and Business Operations [Line Items]
Number of units (in Shares)	1

Churchill Capital Corp XII 10-Q