Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax provision (benefit)		$ 445	$ (1,085)	$ 193
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(1,672)	(2,110)	(800)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(593)	(478)	(535)
Prior-service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(11)	(33)	(37)
Actuarial gains/(losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(774)	(733)	(851)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(785)	(766)	(888)
Income tax provision (benefit)		196	280	343
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(589)	(486)	(545)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(2)	1	3
Income tax provision (benefit)		0	0	0
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(2)	1	3
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(3)	9	10
Income tax provision (benefit)		1	(2)	(3)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Foreign Exchange Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[3]	(3)	9	10
Net Gains and Losses on Cash Flow Hedging Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(2)	7	7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		$ 2	$ (7)	$ (7)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 18 for additional details).

[2] Amounts for 2016 and 2017 were reclassed to Net (gains) losses on sales and impairment of businesses.

[3] This accumulated other comprehensive income component is included in our derivatives and hedging activities (see Note 16 for additional details).