ACQUISITIONS, GOODWILL AND OTHER INTANGIBLE ASSETS - Baker Hughes (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended	12 Months Ended
	Jul. 03, 2017	Jun. 30, 2018	Dec. 31, 2017
BHGE
Business Acquisition [Line Items]
Increase (decrease) to additional paid in capital		$ 94	$ (126)
Increase in goodwill		787
Reduction in fair value of property, plant and equipment		362
Reduction to fair value of equity method investments		228
Reduction in intangible assets		123
Increase in other liabilities		315
Deferred tax adjustments to goodwill		251
Cumulative decrease to depreciation and amortization expense		$ 33
BHGE | GE
Business Acquisition [Line Items]
Cash consideration	$ 7,498
Ownership interest acquired (as a percent)	62.50%
Total consideration	$ 24,798
Noncontrolling interest	$ 16,235
BHGE | GE | Class B Common Stock
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)	62.50%
BHGE | Baker Hughes
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)	37.50%
BHGE | BHGE | Baker Hughes
Business Acquisition [Line Items]
Special one-time cash dividend (in dollars per share)	$ 17.50
BHGE | BHGE | Class A Common Stock | Baker Hughes
Business Acquisition [Line Items]
Shares of BHGE Class A Common Stock received by Baker Hughes' former shareholders (in shares)	1
Baker Hughes
Business Acquisition [Line Items]
Cash consideration	$ 7,498
Total consideration	24,798
Noncontrolling interest	35
Baker Hughes | Oil & Gas
Business Acquisition [Line Items]
Goodwill deductible for tax purposes	$ 67