Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 12, 2020
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Registrant Name	Churchill Capital Corp III
Entity Central Index Key	0001793229
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
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		110,000,000
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		27,500,000