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, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)		$ (83)
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit)		1
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Defined Benefit Plan, Benefit Obligation, beginning		3,993	$ 4,345
Service cost		39	44	$ 30
Interest cost		131	164	183
Plan amendments		0	4
Actuarial changes in assumptions and experience		155	(178)
Benefits paid		(285)	(293)
Other (1)	[1]	(8)	(93)
Defined Benefit Plan, Benefit Obligation, end		4,025	3,993	4,345
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets, Beginning		3,173	3,543
Actual return on plan assets		165	14
Employer contributions		52	2
Asset transfers (1)	[1]	(8)	(93)
Benefits Paid		(285)	(293)
Fair Value of Plan Assets, Ending		3,097	3,173	3,543
Funded status at end of year		(928)	(820)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities		(2)	(2)
Noncurrent liabilities		(926)	(818)
Net amounts recognized in the consolidated balance sheets		(928)	(820)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net loss (gain)		2,035	1,902
Prior service credit		(13)	(14)
Pretax balance in AOCI at end of year		2,022	1,888
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)		(6)
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Defined Benefit Plan, Benefit Obligation, beginning		276	270
Service cost		1	1	1
Interest cost		8	10	13
Plan amendments		0	0
Actuarial changes in assumptions and experience		4	19
Benefits paid		(25)	(24)
Other (1)		0	0
Defined Benefit Plan, Benefit Obligation, end		264	276	270
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 transfers (1)		0	0
Benefits Paid		0	0
Fair Value of Plan Assets, Ending		0	0	$ 0
Funded status at end of year		(264)	(276)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities		(24)	(26)
Noncurrent liabilities		(240)	(250)
Net amounts recognized in the consolidated balance sheets		(264)	(276)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net loss (gain)		(69)	(80)
Prior service credit		0	0
Pretax balance in AOCI at end of year		$ (69)	(80)
Insurance Company [Domain] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation			$ 71

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