Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 31, 2018
Document Information [Line Items]
Entity Registrant Name	Bloom Energy Corp
Entity Central Index Key	0001664703
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		20,783,292
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		88,443,586