Income Taxes Level 4 (Details) - Presentation of the Net Deferred Tax Liability - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Jul. 01, 2019	Dec. 31, 2018	Dec. 31, 2016
Assets
Long-term deferred income taxes		$ (6)		$ 0
Liabilities [Abstract]
Long-term deferred income taxes		(164)		(15)
Net deferred tax liability		(158)		(15)
net operating loss carryforward reduction	$ 185
Valuation allowance	$ 522	140	$ 120	547	$ 651
Deferred Tax Assets, Operating Loss Carryforwards, Domestic		319
Valuation allowance on state net operating loss carryforwards		6
Operating Loss Carryforwards, Valuation Allowance		58	$ 1,053
Unrepatriated earnings of foreign subsidiaries		$ 10		$ 10