Income Taxes Level 4 (Details) - Deferred Tax Assets and Liabilities - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019	Jul. 02, 2019	Jul. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Non-pension post-employment		$ 4	$ 4
Accrued and other expenses		61	97
Deferred Tax Assets, Property, Plant and Equipment		0	4
Loss, expense, and credit carryforwards		240	163
Intangible assets		11	0
Pension and postretirement benefit liabilities		47	14
Gross deferred tax assets		363	282
Valuation allowance		(217)	(122)	$ (98)	$ (98)	$ (525)	$ (498)
Net deferred tax asset		146	160
Liabilities [Abstract]
Property, plant and equipment		(227)	(228)
Unrepatriated earnings of foreign subsidiaries		(7)	(10)
Intangible assets		(66)	(65)
Gross deferred tax liabilities		(300)	(303)
Net deferred tax liability(1)	[1]	$ (154)	$ (143)

[1] Excludes net deferred tax liability of $20 and $15 for the years ended December 31, 2020 and 2019 respectively, related to the Held for Sale Business.