REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS 2 (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Revenue	$ 9,729	$ 10,762	$ 10,919	$ 10,392	$ 10,843	$ 10,121	$ 10,078	$ 9,492	$ 41,802	$ 40,534	$ 39,302
Disaggregation of revenue, timing of recognition - percentage									100.00%
Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 32,848	32,317	31,362
Disaggregation of revenue, timing of recognition - percentage									79.00%
Products [Member] | Transferred At Point In Time [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									67.00%
Products [Member] | Transferred Over Time [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									12.00%
Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 8,954	8,217	7,940
Disaggregation of revenue, timing of recognition - percentage									21.00%
Services [Member] | Transferred At Point In Time [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									7.00%
Services [Member] | Transferred Over Time [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of revenue, timing of recognition - percentage									14.00%
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 15,493
Aerospace [Member] | Commercial Aviation Original Equipment [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,833
Aerospace [Member] | Commercial Aviation Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Revenue									5,373
Aerospace [Member] | Defense Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue									4,665
Aerospace [Member] | Transportation Systems [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,622
Aerospace [Member] | Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									10,415	10,067	9,926
Aerospace [Member] | Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue									5,078	4,712	4,825
Home And Building Technologies [Member]
Disaggregation Of Revenue [Line Items]
Revenue									9,298
Home And Building Technologies [Member] | Products And Software [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,732
Home And Building Technologies [Member] | Distribution ADI [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,196
Home And Building Technologies [Member] | Building Management Systems [Member]
Disaggregation Of Revenue [Line Items]
Revenue									830
Home And Building Technologies [Member] | Building Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,417
Home And Building Technologies [Member] | Building Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,123
Home And Building Technologies [Member] | Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									7,868	8,396	8,250
Home And Building Technologies [Member] | Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,430	1,381	1,240
Performance Materials And Technologies [Member]
Disaggregation Of Revenue [Line Items]
Revenue									10,674
Performance Materials And Technologies [Member] | UOP [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,845
Performance Materials And Technologies [Member] | Process Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue									3,758
Performance Materials And Technologies [Member] | Smart Energy [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,223
Performance Materials And Technologies [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,134
Performance Materials And Technologies [Member] | Fluorine Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,714
Performance Materials And Technologies [Member] | Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									8,589	8,521	8,725
Performance Materials And Technologies [Member] | Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,085	1,818	1,711
Safety And Productivity Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue									6,337
Safety And Productivity Solutions [Member] | Safety And Retail [Member]
Disaggregation Of Revenue [Line Items]
Revenue									2,278
Safety And Productivity Solutions [Member] | Productivity Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,373
Safety And Productivity Solutions [Member] | Warehouse And Workflow Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue									1,829
Safety And Productivity Solutions [Member] | Sensing & Internet-of-Things (IoT)
Disaggregation Of Revenue [Line Items]
Revenue									857
Safety And Productivity Solutions [Member] | Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									5,976	5,333	4,461
Safety And Productivity Solutions [Member] | Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 361	$ 306	$ 164