Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in Accumulated Other Comprehensive Loss [Abstract]
AOCI, Post-employment Benefits, net of tax	$ 47	$ 572
AOCI, Hedge instruments, net of tax	0	(15)
AOCI, Translation adjustments and other, net of tax	(37)	(797)
Accumulated other comprehensive loss	(84)	(1,384)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	1
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(3)
Other comprehensive income, translation adjustments and other, before reclassificaitons, net of tax	(86)
Other comprehensive income, before reclassifications to income	(88)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	20
Amount of Loss Reclassified from AOCI into Income (Effective Portion)	0
Reclassificaion of translation adjustments and other in AOCI into earnings, net of tax	0
Other comprehensive income, portion representing reclassificaitons to earnings	20
Post-employment benefits	21	50	$ 18
Hedge instruments	(3)	(1)	3
Translation adjustments and other	(86)	124	(148)
Other comprehensive (loss) income, net of tax	(68)	$ 173	$ (127)
other comprehensive income (loss), defined benefit plan, Gain (loss), Reclassification adjustment from disposition of consolidated subsidiaries	504
Derivative Instruments, Gain (Loss) reclassification from Accumulated OCI related to the Disposition of consolidated subsidiaries	18
Reclassificaion of translation adjustments and other in AOCI due to disposition of consolidated subsidiaries	846
Other comprehensive income, portion representing disposition of consolidated subsidiaries	$ 1,368