Document And Entity Information - shares	5 Months Ended
	Sep. 30, 2020	Nov. 09, 2020
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Registrant Name	Churchill Capital Corp IV
Entity Central Index Key	0001811210
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Transition Report	false
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Shares of Class A common stock
Trading Symbol	CCIV
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		207,000,000
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		51,750,000
Units, each consisting of one share of Class A Common Stock and one-fifth of one warrant
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-fifth of one warrant
Trading Symbol	CCIV.U
Security Exchange Name	NYSE
Warrants included as part of the units
Document Information [Line Items]
Title of 12(b) Security	Warrants included as part of the units
Trading Symbol	CCIV WS
Security Exchange Name	NYSE