RETIREMENT BENEFITS - Sensitivities of Certain Key Assumptions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Effect of one-percentage-point increase in discount rates	$ 7
Effect of one-percentage-point decrease in discount rates	(11)
Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Effect of one-percentage-point increase in discount rates	(5)
Effect of one-percentage-point decrease in discount rates	7
U.S. Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Effect of one-percentage-point increase in discount rates	0
Effect of one-percentage-point decrease in discount rates	0
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Effect of one-percentage-point increase in discount rates	(2)
Effect of one-percentage-point decrease in discount rates	$ 2