Income Taxes Level 4 (Details) - Reconciliation of Differences Between Income Taxes For Continuing Operations and Provisions for Income Taxes - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes Reconciliation between Continuing Operations and Provisions for Income Taxes [Line Items]
Income tax benefit computed at federal statutory tax rate	$ (26)	$ (77)	$ (4)
State tax provision, net of federal benefits	1	0	0
Foreign tax rate expense (benefit) differential	9	(2)	(18)
Foreign source income (loss) subject to U.S. taxation	2	(45)	21
Losses (gains) and other expenses (income) not deductible (excluded) for tax	10	20	(4)
Increase (decrease) in the taxes due to changes in valuation allowance	25	(129)	42
Additional expense (benefit) on foreign unrepatriated earnings	(1)	0	(16)
Additional expense for uncertain tax positions	18	5	(3)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	0	(3)	0
Changes in enacted tax laws and tax rates	0	167	0
Transition tax expense	0	65	0
write off net operating loss	0	17	20
Income tax expense	$ 40	$ 18	$ 38