OTHER COMPREHENSIVE INCOME Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, April 1, 2017	[1]	$ (5,152)		$ (5,389)		$ (5,362)		$ (5,708)
Other comprehensive income (loss) before reclassifications	[1]	(13)		(422)		143		(165)
Amounts reclassified from accumulated other comprehensive income	[1]	58		329		113		392
Net Current Period Other Comprehensive Income (Loss)	[1]	45		(93)		256		227
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interest		(1)	[1]	1	[1]	(2)	[1]	0
Balance, June 30, 2017	[1]	(5,108)		(5,481)		(5,108)		(5,481)
Defined Benefit Pension and Postretirement Items (a)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, April 1, 2017	[1]	(3,016)		(3,088)		(3,072)		(3,169)
Other comprehensive income (loss) before reclassifications	[1]	2		(545)		1		(528)
Amounts reclassified from accumulated other comprehensive income	[1]	60		335		117		399
Net Current Period Other Comprehensive Income (Loss)	[1]	62		(210)		118		(129)
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interest	[1]	0		0		0		0
Balance, June 30, 2017	[1]	(2,954)		(3,298)		(2,954)		(3,298)
Change in Cumulative Foreign Currency Translation Adjustments (a)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, April 1, 2017	[1]	(2,140)		(2,314)		(2,287)		(2,549)
Other comprehensive income (loss) before reclassifications	[1]	(14)		137		134		373
Amounts reclassified from accumulated other comprehensive income	[1]	0		(3)		0		(3)
Net Current Period Other Comprehensive Income (Loss)	[1]	(14)		134		134		370
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interest	[1]	(1)		1		(2)		0
Balance, June 30, 2017	[1]	(2,155)		(2,179)		(2,155)		(2,179)
Net Gains and Losses on Cash Flow Hedging Derivatives (a)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, April 1, 2017	[1]	4		13		(3)		10
Other comprehensive income (loss) before reclassifications	[1]	(1)		(14)		8		(10)
Amounts reclassified from accumulated other comprehensive income	[1]	(2)		(3)		(4)		(4)
Net Current Period Other Comprehensive Income (Loss)	[1]	(3)		(17)		4		(14)
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interest	[1]	0		0		0		0
Balance, June 30, 2017	[1]	$ 1		$ (4)		$ 1		$ (4)

[1] All amounts are net of tax. Amounts in parentheses indicate debits to AOCI.