Shareholders' Deficit (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of changes in accumulated comprehensive income [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 2
Beginning Accumulated Other Comprehensive Income (Loss), Net of Tax	(334)
Gains (losses) arising during the year classified into accumulated OCI, net of tax	19
(Gains) losses reclassified from accumulated OCI, net of tax	(9)
Other comprehensive income (loss), net of tax	10	$ 54
Ending Accumulated Other Comprehensive Income (Loss), Net of Tax	(324)
Translation Adjustments and Gains (Losses) From Intra-Entity Transactions of a Long-Term Nature
Schedule of changes in accumulated comprehensive income [Line Items]
Beginning Accumulated Other Comprehensive Income (Loss), Net of Tax	(245)
Gains (losses) arising during the year classified into accumulated OCI, net of tax	30
(Gains) losses reclassified from accumulated OCI, net of tax	0
Other comprehensive income (loss), net of tax	30
Ending Accumulated Other Comprehensive Income (Loss), Net of Tax	(215)
Pension and Post-Retirement Benefits
Schedule of changes in accumulated comprehensive income [Line Items]
Beginning Accumulated Other Comprehensive Income (Loss), Net of Tax	(82)
Gains (losses) arising during the year classified into accumulated OCI, net of tax	0
(Gains) losses reclassified from accumulated OCI, net of tax	3
Other comprehensive income (loss), net of tax	3
Ending Accumulated Other Comprehensive Income (Loss), Net of Tax	(79)
Derivative Instruments
Schedule of changes in accumulated comprehensive income [Line Items]
Beginning Accumulated Other Comprehensive Income (Loss), Net of Tax	(7)
Gains (losses) arising during the year classified into accumulated OCI, net of tax	(11)
(Gains) losses reclassified from accumulated OCI, net of tax	(12)
Other comprehensive income (loss), net of tax	(23)
Ending Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (30)