RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure
Percentage of the significant plans over global pension and postretirement liabilities, which utilize quarterly measurement policy	90.00%
U.S. Pension Plans
Amortization of unrecognized
Total net (benefit) expense	$ (30)	$ (35)
U.S. Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	1	2
Interest cost on benefit obligation	141	137
Expected return on plan assets	(218)	(222)
Amortization of unrecognized
Prior service benefit	0	(1)
Net actuarial loss	36	37
Curtailment loss (gain)	0	0
Settlement loss (gain)	0	0
Total net (benefit) expense	(40)	(47)
U.S. Nonqualified Pension Plan
Amortization of unrecognized
Total net (benefit) expense	10	12
Non-U.S. Pension Plans
Amortization of unrecognized
Total net (benefit) expense	56	61
Non-U.S. Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	38	44
Interest cost on benefit obligation	73	80
Expected return on plan assets	(72)	(84)
Amortization of unrecognized
Prior service benefit	0	0
Net actuarial loss	19	21
Curtailment loss (gain)	(3)	0
Settlement loss (gain)	1	0
Total net (benefit) expense	56	61
Non-U.S. Nonqualified Pension Plan
Amortization of unrecognized
Total net (benefit) expense	0	0
U.S. Postretirement Benefit Plans
Amortization of unrecognized
Total net (benefit) expense	6	8
U.S. Qualified Postretirement Benefit Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	0	0
Interest cost on benefit obligation	8	8
Expected return on plan assets	(2)	0
Amortization of unrecognized
Prior service benefit	0	0
Net actuarial loss	0	0
Curtailment loss (gain)	0	0
Settlement loss (gain)	0	0
Total net (benefit) expense	6	8
U.S. Nonqualified Postretirement Benefit Plan
Amortization of unrecognized
Total net (benefit) expense	0	0
Non-U.S. Postretirement Benefit Plans
Amortization of unrecognized
Total net (benefit) expense	11	10
Non-U.S. Qualified Postretirement Benefit Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	3	4
Interest cost on benefit obligation	24	27
Expected return on plan assets	(21)	(29)
Amortization of unrecognized
Prior service benefit	(3)	(3)
Net actuarial loss	8	11
Curtailment loss (gain)	0	0
Settlement loss (gain)	0	0
Total net (benefit) expense	11	10
Non-U.S. Nonqualified Postretirement Benefit Plan
Amortization of unrecognized
Total net (benefit) expense	$ 0	$ 0