Cover Page - shares	6 Months Ended
	Jun. 30, 2024	Jul. 31, 2024
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Entity Registrant Name	IONQ, INC.
Entity Central Index Key	0001824920
Current Fiscal Year End Date	--12-31
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE
Entity File Number	001-39694
Entity Tax Identification Number	85-2992192
Entity Address, Address Line One	4505 Campus Drive
Entity Address, City or Town	College Park
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20740
City Area Code	301
Local Phone Number	298-7997
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		214,076,151
Warrant [Member]
Entity Information [Line Items]
Trading Symbol	IONQ WS
Title of 12(b) Security	Warrants, each exercisable for one share of common stock for $11.50 per share
Security Exchange Name	NYSE
Common Stock [Member]
Entity Information [Line Items]
Trading Symbol	IONQ
Title of 12(b) Security	Common stock, par value $0.0001 per share
Security Exchange Name	NYSE