RETIREMENT BENEFITS - Contributions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
U.S. Pension Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions for the three months ended March 31	$ 13	$ 15
Company contributions made or expected to be made during the remainder of the year	43	541
Non-U.S. Pension Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions for the three months ended March 31	34	32
Company contributions made or expected to be made during the remainder of the year	105	94
U.S. Postretirement Benefit Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions for the three months ended March 31	12	6
Company contributions made or expected to be made during the remainder of the year	0	0
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions for the three months ended March 31	2	2
Company contributions made or expected to be made during the remainder of the year	$ 6	$ 7