OTHER COMPREHENSIVE INCOME Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015		Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	[1]					$ (5,708)	$ (4,646)
Other comprehensive income (loss), before reclassifications, net of tax	[1]	$ 257		$ (478)
Reclassification from accumulated other comprehensive income, current period, net of tax	[1]	63		81
Other comprehensive income (loss), net of tax	[1]	320		(397)
Comprehensive (income) loss, net of tax, attributable to noncontrolling interest	[1]	(1)		1
Accumulated Other Comprehensive Income (Loss), Net of Tax		(5,389)	[1]	(5,042)	[1]	(5,708)
Accumulated Defined Benefit Pension Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	[1]					(3,169)	(3,134)
Other comprehensive income (loss), before reclassifications, net of tax	[1]	17		0
Reclassification from accumulated other comprehensive income, current period, net of tax	[1]	64		78
Other comprehensive income (loss), net of tax	[1]	81		78
Comprehensive (income) loss, net of tax, attributable to noncontrolling interest	[1]	0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	[1]	(3,088)		(3,056)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	[1]					(2,549)	(1,513)
Other comprehensive income (loss), before reclassifications, net of tax	[1]	236		(484)
Reclassification from accumulated other comprehensive income, current period, net of tax	[1]	0		0
Other comprehensive income (loss), net of tax	[1]	236		(484)
Comprehensive (income) loss, net of tax, attributable to noncontrolling interest	[1]	(1)		1
Accumulated Other Comprehensive Income (Loss), Net of Tax	[1]	(2,314)		(1,996)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	[1]					$ 10	$ 1
Other comprehensive income (loss), before reclassifications, net of tax	[1]	4		6
Reclassification from accumulated other comprehensive income, current period, net of tax	[1]	(1)		3
Other comprehensive income (loss), net of tax	[1]	3		9
Comprehensive (income) loss, net of tax, attributable to noncontrolling interest	[1]	0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	[1]	$ 13		$ 10

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