Income Taxes Level 4 (Details) - Presentation of the Net Deferred Tax Liability - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019	Jul. 02, 2019	Jul. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Long-term deferred income taxes		$ 7	$ 6
Liabilities [Abstract]
Long-term deferred income taxes		161	149
Net deferred tax liability(1)	[1]	(154)	(143)
Valuation allowance		217	122	$ 98	$ 98	$ 525	$ 498
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		636
Valuation allowance on state net operating loss carryforwards		19
Operating Loss Carryforwards, Valuation Allowance		97			$ 1,053
Unrepatriated earnings of foreign subsidiaries		7	10
Discontinued Operations
Liabilities [Abstract]
Net deferred tax liability(1)		$ (20)	$ (15)

[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.