RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. Pension Plans
Amortization of unrecognized
Total net (benefit) expense	$ (32)	$ (35)	$ (100)	$ (105)
U.S. Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	1	1	2	3
Interest cost on benefit obligation	126	143	399	411
Expected return on plan assets	(224)	(223)	(660)	(668)
Amortization of unrecognized
Prior service benefit	0	0	0	(2)
Net actuarial loss (gain)	43	31	118	106
Curtailment loss (gain)	10	2	10	12
Settlement (gain) loss	0	0	0	0
Total net (benefit) expense	(44)	(46)	(131)	(138)
U.S. Nonqualified Pension Plan
Amortization of unrecognized
Total net (benefit) expense	12	11	31	33
Non-U.S. Pension Plans
Amortization of unrecognized
Total net (benefit) expense	55	55	171	174
Non-U.S. Qualified Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	39	42	116	129
Interest cost on benefit obligation	70	77	216	237
Expected return on plan assets	(71)	(81)	(217)	(248)
Amortization of unrecognized
Prior service benefit	0	0	(1)	0
Net actuarial loss (gain)	19	17	58	56
Curtailment loss (gain)	0	0	(3)	0
Settlement (gain) loss	(2)	0	2	0
Total net (benefit) expense	55	55	171	174
Non-U.S. Nonqualified Pension Plan
Amortization of unrecognized
Total net (benefit) expense	0	0	0	0
U.S. Postretirement Benefit Plans
Amortization of unrecognized
Total net (benefit) expense	4	8	11	24
U.S. Qualified Postretirement Benefit Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	0	0	0	0
Interest cost on benefit obligation	6	8	19	24
Expected return on plan assets	(2)	0	(7)	0
Amortization of unrecognized
Prior service benefit	0	0	0	0
Net actuarial loss (gain)	0	0	(1)	0
Curtailment loss (gain)	0	0	0	0
Settlement (gain) loss	0	0	0	0
Total net (benefit) expense	4	8	11	24
U.S. Nonqualified Postretirement Benefit Plan
Amortization of unrecognized
Total net (benefit) expense	0	0	0	0
Non-U.S. Postretirement Benefit Plans
Amortization of unrecognized
Total net (benefit) expense	10	10	31	35
Non-U.S. Qualified Postretirement Benefit Plan
Defined Benefit Plan, Net Periodic Benefit Cost
Benefits earned during the period	1	3	7	10
Interest cost on benefit obligation	24	25	72	82
Expected return on plan assets	(22)	(25)	(65)	(81)
Amortization of unrecognized
Prior service benefit	(1)	(3)	(7)	(9)
Net actuarial loss (gain)	8	10	24	33
Curtailment loss (gain)	0	0	0	0
Settlement (gain) loss	0	0	0	0
Total net (benefit) expense	10	10	31	35
Non-U.S. Nonqualified Postretirement Benefit Plan
Amortization of unrecognized
Total net (benefit) expense	$ 0	$ 0	$ 0	$ 0