RETIREMENT BENEFITS - Funded Status and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
U.S. Pension Plans
Change in plan assets
Company contributions				$ 22	$ 23
U.S. Pension Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at period end	$ 13,983			13,983
Change in plan assets
Plan assets at fair value at period end - Significant Plans	12,944			12,944
Funded status of the plans	(1,039)			(1,039)
Net amount recognized
Net amount recognized on the balance sheet - Significant Plans	(1,039)			(1,039)
Amounts recognized in Accumulated other comprehensive income (loss)
Net amount recognized in equity-pretax	(5,508)			(5,508)
Accumulated benefit obligation at period end	13,966			13,966
U.S. Qualified Pension Plan
Change in projected benefit obligation
Projected benefit obligation at beginning of year		$ 14,839		14,839
Benefits earned during the period	0		$ 1	2	3
Interest cost on benefit obligation	131		138	268	278
Curtailment loss	10
First quarter activity		201
Change in plan assets
Plan assets at fair value at beginning of year		13,071		13,071
First quarter activity		129
U.S. Qualified Pension Plan | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year		0		0
Change in plan assets
Plan assets at fair value at beginning of year		0		0
U.S. Qualified Pension Plan | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	15,040	14,839		14,839
Benefits earned during the period	1
Interest cost on benefit obligation	137
Actuarial (gain) loss	(1,011)
Benefits paid, net of participants’ contributions	(194)
Foreign exchange impact and other	0
Projected benefit obligation at period end		15,040
Change in plan assets
Plan assets at fair value at beginning of year	13,200	13,071		13,071
Actual return on plan assets	(75)
Company contributions	13
Plan participants’ contributions	0
Benefits paid	(194)
Foreign exchange impact and other	0
Plan assets at fair value at period end - Significant Plans		13,200
Funded status of the plans	(314)			(314)
Net amount recognized
Benefit asset	0			0
Benefit liability	(1,039)			(1,039)
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	0			0
Net actuarial gain (loss)	(5,508)			(5,508)
U.S. Nonqualified Pension Plan | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the plans	(725)			(725)
Non - U.S. Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year		7,252		7,252
Benefits earned during the period	43		47	87	93
Interest cost on benefit obligation	80		98	160	194
Curtailment loss	0
First quarter activity		(47)
Change in plan assets
Plan assets at fair value at beginning of year		7,057		7,057
Company contributions				29	87
First quarter activity		(154)
Non - U.S. Pension Plans | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year		2,070		2,070
Change in plan assets
Plan assets at fair value at beginning of year		1,406		1,406
Non - U.S. Pension Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	5,135	5,182		5,182
Benefits earned during the period	25
Interest cost on benefit obligation	65
Actuarial (gain) loss	(153)
Benefits paid, net of participants’ contributions	(51)
Foreign exchange impact and other	114
Projected benefit obligation at period end	5,135	5,135		5,135
Change in plan assets
Plan assets at fair value at beginning of year	5,497	5,651		5,651
Actual return on plan assets	(142)
Company contributions	12
Plan participants’ contributions	1
Benefits paid	(52)
Foreign exchange impact and other	158
Plan assets at fair value at period end - Significant Plans	5,474	5,497		5,474
Funded status of the plans	339			339
Net amount recognized
Benefit asset	339			339
Benefit liability	0			0
Net amount recognized on the balance sheet - Significant Plans	339			339
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	13			13
Net actuarial gain (loss)	(1,188)			(1,188)
Net amount recognized in equity-pretax	(1,175)			(1,175)
Accumulated benefit obligation at period end	4,819			4,819
U.S. Postretirement Benefit Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year		917		917
Benefits earned during the period	0		0	0	0
Interest cost on benefit obligation	8		9	16	17
Curtailment loss	0
First quarter activity		3
Change in plan assets
Plan assets at fair value at beginning of year		10		10
Company contributions				32	20
First quarter activity		(4)
U.S. Postretirement Benefit Plans | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year		0		0
Change in plan assets
Plan assets at fair value at beginning of year		0		0
U.S. Postretirement Benefit Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	920	917		917
Benefits earned during the period	0
Interest cost on benefit obligation	7
Actuarial (gain) loss	(70)
Benefits paid, net of participants’ contributions	(13)
Foreign exchange impact and other	0
Projected benefit obligation at period end	844	920		844
Change in plan assets
Plan assets at fair value at beginning of year	6	10		10
Actual return on plan assets	(2)
Company contributions	12
Plan participants’ contributions	0
Benefits paid	(13)
Foreign exchange impact and other	0
Plan assets at fair value at period end - Significant Plans	3	6		3
Funded status of the plans	(841)			(841)
Net amount recognized
Benefit asset	0			0
Benefit liability	(841)			(841)
Net amount recognized on the balance sheet - Significant Plans	(841)			(841)
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	0			0
Net actuarial gain (loss)	(7)			(7)
Net amount recognized in equity-pretax	(7)			(7)
Accumulated benefit obligation at period end	844			844
Non-U.S. Postretirement Benefit Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year		1,527		1,527
Benefits earned during the period	3		3	7	7
Interest cost on benefit obligation	30		$ 31	57	60
Curtailment loss	0
First quarter activity		(25)
Change in plan assets
Plan assets at fair value at beginning of year		1,384		1,384
Company contributions				5	$ 8
First quarter activity		(54)
Non-U.S. Postretirement Benefit Plans | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year		348		348
Change in plan assets
Plan assets at fair value at beginning of year		9		9
Non-U.S. Postretirement Benefit Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,154	1,179		1,179
Benefits earned during the period	3
Interest cost on benefit obligation	22
Actuarial (gain) loss	(55)
Benefits paid, net of participants’ contributions	(13)
Foreign exchange impact and other	(31)
Projected benefit obligation at period end	1,080	1,154		1,080
Change in plan assets
Plan assets at fair value at beginning of year	1,321	1,375		1,375
Actual return on plan assets	5
Company contributions	0
Plan participants’ contributions	0
Benefits paid	(13)
Foreign exchange impact and other	(35)
Plan assets at fair value at period end - Significant Plans	1,278	$ 1,321		1,278
Funded status of the plans	198			198
Net amount recognized
Benefit asset	198			198
Benefit liability	0			0
Net amount recognized on the balance sheet - Significant Plans	198			198
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	127			127
Net actuarial gain (loss)	(486)			(486)
Net amount recognized in equity-pretax	(359)			(359)
Accumulated benefit obligation at period end	$ 1,080			$ 1,080