RETIREMENT BENEFITS - Funded Status and Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
U.S. Pension Plans
Change in plan assets
Company contributions	$ 11	$ 11
U.S. Pension Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at period end - Significant Plans	15,040
Change in plan assets
Plan assets at fair value at period end - Significant Plans	13,200
Funded status of the plans	(1,840)
Net amount recognized
Net amount recognized on the balance sheet - Significant Plans	(1,840)
Amounts recognized in Accumulated other comprehensive income (loss)
Net amount recognized in equity-pretax	(6,061)
Accumulated benefit obligation at period end	15,021
U.S. Qualified Pension Plan
Change in projected benefit obligation
Projected benefit obligation at beginning of year	14,839
Benefits earned during the year	2	2
Interest cost on benefit obligation	137	140
Change in plan assets
Plan assets at fair value at beginning of year	13,071
U.S. Qualified Pension Plan | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			0
Projected benefit obligation at period end - Significant Plans			0
Change in plan assets
Plan assets at fair value at beginning of year			0
Plan assets at fair value at period end - Significant Plans			0
U.S. Qualified Pension Plan | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	14,839
Benefits earned during the year	3
Interest cost on benefit obligation	144
Plan amendments	0
Actuarial (gain) loss	252
Benefits paid, net of participants’ contributions	(198)
Foreign exchange impact and other	0
Change in plan assets
Plan assets at fair value at beginning of year	13,071
Actual return on plan assets	314
Company contributions	13
Plan participants’ contributions	0
Benefits paid	(198)
Foreign exchange impact and other	0
Funded status of the plans	(1,051)
Net amount recognized
Benefit asset	0
Benefit liability	(1,840)
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	(1)
Net actuarial gain (loss)	(6,060)
U.S. Nonqualified Pension Plan | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the plans	(789)
Non - U.S. Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	7,252
Benefits earned during the year	44	46
Interest cost on benefit obligation	80	96
Change in plan assets
Plan assets at fair value at beginning of year	7,057
Company contributions	26	43
Non - U.S. Pension Plans | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			2,070
Projected benefit obligation at period end - Significant Plans			2,070
Change in plan assets
Plan assets at fair value at beginning of year			1,406
Plan assets at fair value at period end - Significant Plans			1,406
Non - U.S. Pension Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	5,182
Benefits earned during the year	25
Interest cost on benefit obligation	66
Plan amendments	6
Actuarial (gain) loss	144
Benefits paid, net of participants’ contributions	(56)
Foreign exchange impact and other	(232)
Projected benefit obligation at period end - Significant Plans	5,135
Change in plan assets
Plan assets at fair value at beginning of year	5,651
Actual return on plan assets	169
Company contributions	13
Plan participants’ contributions	1
Benefits paid	(56)
Foreign exchange impact and other	(281)
Plan assets at fair value at period end - Significant Plans	5,497
Funded status of the plans	362
Net amount recognized
Benefit asset	362
Benefit liability	0
Net amount recognized on the balance sheet - Significant Plans	362
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	15
Net actuarial gain (loss)	(1,145)
Net amount recognized in equity-pretax	(1,130)
Accumulated benefit obligation at period end	4,811
U.S. Postretirement Benefit Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	917
Benefits earned during the year	0	0
Interest cost on benefit obligation	8	8
Change in plan assets
Plan assets at fair value at beginning of year	10
Company contributions	20	10
U.S. Postretirement Benefit Plans | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			0
Projected benefit obligation at period end - Significant Plans			0
Change in plan assets
Plan assets at fair value at beginning of year			0
Plan assets at fair value at period end - Significant Plans			0
U.S. Postretirement Benefit Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	917
Benefits earned during the year	0
Interest cost on benefit obligation	8
Plan amendments	0
Actuarial (gain) loss	19
Benefits paid, net of participants’ contributions	(24)
Foreign exchange impact and other	0
Projected benefit obligation at period end - Significant Plans	920
Change in plan assets
Plan assets at fair value at beginning of year	10
Actual return on plan assets	0
Company contributions	20
Plan participants’ contributions	0
Benefits paid	(24)
Foreign exchange impact and other	0
Plan assets at fair value at period end - Significant Plans	6
Funded status of the plans	(914)
Net amount recognized
Benefit asset	0
Benefit liability	(914)
Net amount recognized on the balance sheet - Significant Plans	(914)
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	0
Net actuarial gain (loss)	(75)
Net amount recognized in equity-pretax	(75)
Non-U.S. Postretirement Benefit Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,527
Benefits earned during the year	4	4
Interest cost on benefit obligation	27	29
Change in plan assets
Plan assets at fair value at beginning of year	1,384
Company contributions	7	3
Non-U.S. Postretirement Benefit Plans | Plans measured annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			348
Projected benefit obligation at period end - Significant Plans			348
Change in plan assets
Plan assets at fair value at beginning of year			9
Plan assets at fair value at period end - Significant Plans			9
Non-U.S. Postretirement Benefit Plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,179
Benefits earned during the year	3
Interest cost on benefit obligation	23
Plan amendments	0
Actuarial (gain) loss	0
Benefits paid, net of participants’ contributions	(10)
Foreign exchange impact and other	(41)
Projected benefit obligation at period end - Significant Plans	1,154
Change in plan assets
Plan assets at fair value at beginning of year	1,375
Actual return on plan assets	3
Company contributions	0
Plan participants’ contributions	0
Benefits paid	(10)
Foreign exchange impact and other	(47)
Plan assets at fair value at period end - Significant Plans	1,321
Funded status of the plans	167
Net amount recognized
Benefit asset	167
Benefit liability	0
Net amount recognized on the balance sheet - Significant Plans	167
Amounts recognized in Accumulated other comprehensive income (loss)
Prior service benefit (cost)	134
Net actuarial gain (loss)	(541)
Net amount recognized in equity-pretax	$ (407)