v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
Apr. 23, 2019
Document Information [Line Items]    
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-Q  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Emerging Growth Company false  
Entity Small Business false  
Common Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   515,558,511
Common Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   521,543,095