RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure
Percentage of the significant plans over global pension and postretirement liabilities, which utilize quarterly measurement policy	90.00%		90.00%
U.S. Pension Plans
Amortization of unrecognized
Total net (benefit) expense	$ (35)	$ (38)	$ (105)	$ (122)
U.S. Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the period	1	1	3	4
Interest cost on benefit obligation	143	132	411	410
Expected return on plan assets	(223)	(220)	(668)	(656)
Amortization of unrecognized
Prior service (benefit) cost	0	(1)	(2)	(3)
Net actuarial loss	31	29	106	78
Curtailment loss	2	11	12	11
Settlement loss (gain)	0	0	0	0
Special termination benefits	0	0		0
Total net (benefit) expense	(46)	(48)	(138)	(156)
U.S. Nonqualified Pension Plan
Amortization of unrecognized
Total net (benefit) expense	11	10	33	34
Non - U.S. Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the period	42	43	129	136
Interest cost on benefit obligation	77	93	237	287
Expected return on plan assets	(81)	(98)	(248)	(291)
Amortization of unrecognized
Prior service (benefit) cost	0	0	0	2
Net actuarial loss	17	20	56	60
Curtailment loss	0	(5)	0	12
Settlement loss (gain)	0	26	0	39
Special termination benefits	0	8		8
Total net (benefit) expense	55	87	174	253
U.S. Postretirement Benefit Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the period	0	0	0	0
Interest cost on benefit obligation	8	8	24	25
Expected return on plan assets	0	0	0	(1)
Amortization of unrecognized
Prior service (benefit) cost	0	0	0	0
Net actuarial loss	0	0	0	0
Curtailment loss	0	0	0	0
Settlement loss (gain)	0	0	0	0
Special termination benefits	0	0		0
Total net (benefit) expense	8	8	24	24
Non-U.S. Postretirement Benefit Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Benefits earned during the period	3	4	10	11
Interest cost on benefit obligation	25	30	82	90
Expected return on plan assets	(25)	(31)	(81)	(92)
Amortization of unrecognized
Prior service (benefit) cost	(3)	(3)	(9)	(9)
Net actuarial loss	10	10	33	30
Curtailment loss	0	0	0	0
Settlement loss (gain)	0	0	0	(2)
Special termination benefits	0	0		0
Total net (benefit) expense	$ 10	$ 10	$ 35	$ 28