Shareholders' Deficit (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of changes in accumulated comprehensive income [Line Items]
Accumulated other comprehensive loss	$ (346)		$ (411)
Gains (losses) arising during the year classified into AOCI, net of tax	16		73
(Gains) losses reclassified from AOCI, net of tax	6		14
Other comprehensive income (loss), net of tax	22	$ 61	87	$ (100)
Accumulated other comprehensive loss	(324)		(324)
Translation Adjustments and Gains (Losses) From Intra-Entity Transactions of a Long-Term Nature
Schedule of changes in accumulated comprehensive income [Line Items]
Accumulated other comprehensive loss	(179)		(182)
Gains (losses) arising during the year classified into AOCI, net of tax	14		17
(Gains) losses reclassified from AOCI, net of tax	0		0
Other comprehensive income (loss), net of tax	14		17
Accumulated other comprehensive loss	(165)		(165)
Pension and Post-Retirement Benefits
Schedule of changes in accumulated comprehensive income [Line Items]
Accumulated other comprehensive loss	(55)		(96)
Gains (losses) arising during the year classified into AOCI, net of tax	8		44
(Gains) losses reclassified from AOCI, net of tax	3		8
Other comprehensive income (loss), net of tax	11		52
Accumulated other comprehensive loss	(44)		(44)
Derivative Instruments
Schedule of changes in accumulated comprehensive income [Line Items]
Accumulated other comprehensive loss	(112)		(133)
Gains (losses) arising during the year classified into AOCI, net of tax	(6)		12
(Gains) losses reclassified from AOCI, net of tax	3		6
Other comprehensive income (loss), net of tax	(3)		18
Accumulated other comprehensive loss	$ (115)		$ (115)