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Earnings Per Share - Basic and diluted net income (loss) per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share        
Net income (loss) $ (38) $ (20) $ (57) $ 46
Less: Net income attributable to GE O&G pre-merger 0 (26) 0 42
Less: Net income (loss) attributable to noncontrolling interests (19) 6 (108) 4
Net income (loss) attributable to Baker Hughes, a GE company $ (19) $ 0 $ 51 $ 0
Net income (loss) per share attributable to common stockholders:        
Earnings per share, basic (in dollars per share) $ (0.05) $ 0.12  
Earnings per share, diluted (in dollars per share) $ (0.05) $ 0.12  
Common Class A        
Weighted average shares outstanding:        
Weighted average common shares outstanding, basic (in shares) 414   417  
Weighted average common shares outstanding, diluted (in shares) 414   419  
Net income (loss) per share attributable to common stockholders:        
Earnings per share, basic (in dollars per share) $ (0.05)   $ 0.12  
Earnings per share, diluted (in dollars per share) $ (0.05)   $ 0.12