(Schedule of Reclassifications Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax provision (benefit)		$ 245	$ 634	$ 445
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(482)	(1,220)	(1,672)
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		(523)	259	(593)
Prior-service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(19)	(10)	(11)
Actuarial gains/(losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(207)	(208)	(774)
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		(226)	(218)	(785)
Income tax provision (benefit)		56	54	196
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(170)	(164)	(589)
Income (Loss) from Continuing Operations, Total, Net of Tax		(170)	363	(589)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of stranded tax effects		0	527	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		170	164	589
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		(327)	(102)	(2)
Income tax provision (benefit)		0	0	0
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(327)	(102)	(2)
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		(39)	(6)	(3)
Income tax provision (benefit)		13	2	1
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	[2]	(39)	(6)	(3)
Net Gains and Losses on Cash Flow Hedging Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
EARNINGS (LOSS) FROM CONTINUING OPERATIONS		(26)	(4)	(2)
Reclassification of stranded tax effects		0	2	0
Income (Loss) from Continuing Operations, Total, Net of Tax		(26)	(2)	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		$ 26	$ 4	$ 2

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 19 for additional details).

[2] This accumulated other comprehensive income component is included in our derivatives and hedging activities (see Note 17 for additional details).