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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes Reconciliation between Continuing Operations and Provisions for Income Taxes [Line Items]
Income tax benefit computed at federal statutory tax rate	$ (77)	$ (4)	$ (8)
State tax provision, net of federal benefits	0	0	1
Foreign tax rate (benefit) differential	(2)	(18)	(15)
Foreign source (loss) income subject to U.S. taxation	(45)	21	41
Losses (gains) and other expenses (income) not deductible (excluded) for tax	20	(4)	1
(Decrease) increase in the taxes due to changes in valuation allowance	(129)	42	17
Additional (benefit) expense on foreign unrepatriated earnings	0	(16)	18
Additional expense for uncertain tax positions	5	(3)	3
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	(3)	0	(1)
Changes in enacted tax laws and tax rates	167	0	(23)
Transition tax expense	65	0	0
write off net operating loss	17	20	0
Income tax expense	$ 18	$ 38	$ 34