REVENUES - Equipment and Services Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Industrial Segment
Disaggregation of Revenue [Line Items]
Total Revenues	$ 27,395	$ 25,213
Industrial Segment | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	12,813	12,853
Industrial Segment | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	14,582	12,360
Power
Disaggregation of Revenue [Line Items]
Total Revenues	7,222	7,940
Power | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	3,524	4,186
Power | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	3,698	3,755
Renewable Energy
Disaggregation of Revenue [Line Items]
Total Revenues	1,646	1,767
Renewable Energy | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	1,204	1,506
Renewable Energy | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	442	261
Oil & Gas
Disaggregation of Revenue [Line Items]
Total Revenues	5,385	3,086
Oil & Gas | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	2,229	1,291
Oil & Gas | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	3,156	1,795
Aviation
Disaggregation of Revenue [Line Items]
Total Revenues	7,112	6,673
Aviation | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	2,539	2,599
Aviation | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	4,573	4,074
Healthcare
Disaggregation of Revenue [Line Items]
Total Revenues	4,702	4,305
Healthcare | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	2,607	2,323
Healthcare | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	2,095	1,982
Transportation
Disaggregation of Revenue [Line Items]
Total Revenues	872	979
Transportation | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	266	498
Transportation | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	606	481
Lighting
Disaggregation of Revenue [Line Items]
Total Revenues	456	462
Lighting | Equipment Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	444	450
Lighting | Services Revenues
Disaggregation of Revenue [Line Items]
Total Revenues	$ 12	$ 13