Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 08, 2018	Jul. 05, 2017	Jun. 30, 2017
Entity Registrant Name	Baker Hughes a GE Co
Entity Central Index Key	0001701605
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 15,903,777,000
Class A
Entity Common Stock A, Shares Outstanding		422,581,873
Class B
Entity Common Stock A, Shares Outstanding		706,984,255
Baker Hughes Incorporated
Entity Public Float				$ 23,155,806,000