RETIREMENT BENEFITS - Contributions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
U.S. Pension Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions	$ 15	$ 11
Company contributions made or expected to be made expected during the remainder of the year	40	41
Non-U.S. Pension Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions	32	26
Company contributions made or expected to be made expected during the remainder of the year	103	108
U.S. Postretirement Benefit Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions	14	20
Company contributions made or expected to be made expected during the remainder of the year	0	215
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]
Company contributions	2	7
Company contributions made or expected to be made expected during the remainder of the year	$ 7	$ 2