PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Change in Projected Benefit Obligations, Plan Assets and Funded Status of All Significant Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)	$ (75)
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	1
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Service cost	44		$ 30	$ 31
Interest cost	164		183	165
Defined Benefit Plan, Plan Amendments	4		(38)
Actuarial changes in assumptions and experience	(178)		531
Benefits paid	(293)		(340)
Other	(93)	[1]	(16)
Benefit Obligations, Ending Balance	3,993		4,345	3,995
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	3,543		3,586
Actual return on plan assets	14		312
Employer contributions	2		2
Asset transfer	(93)	[1]	(17)
Benefits Paid	(293)		(340)
Fair Value of Plan Assets, Ending	3,173		3,543	3,586
Funded status at end of year	(820)		(802)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(2)		(1)
Noncurrent liabilities	(818)		(801)
Net amounts recognized in the consolidated balance sheets	(820)		(802)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net loss (gain)	1,902		1,955
Prior service credit	(14)		(19)
Pretax balance in AOCI at end of year	1,888		1,936
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)	(7)
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Service cost	1		1	2
Interest cost	10		13	14
Defined Benefit Plan, Plan Amendments	0		0
Actuarial changes in assumptions and experience	19		(13)
Benefits paid	(24)		(33)
Other	0		0
Benefit Obligations, Ending Balance	276		270	302
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning	0		0
Actual return on plan assets	0		0
Employer contributions	0		0
Asset transfer	0		0
Benefits Paid	0		0
Fair Value of Plan Assets, Ending	0		0	$ 0
Funded status at end of year	(276)		(270)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(26)		(27)
Noncurrent liabilities	(250)		(243)
Net amounts recognized in the consolidated balance sheets	(276)		(270)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net loss (gain)	(80)		(109)
Prior service credit	0		(1)
Pretax balance in AOCI at end of year	$ (80)		$ (110)

[1] (1)The 2015 impact includes the transfer of benefit obligations of $71 million through the purchase of annuity contracts from an insurance company.