Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance [Abstract]
Valuation allowance	$ 1,023,000,000	$ 995,000,000
State deferred tax assets	244,000,000
Foreign deferred tax assets	1,000,000
Change in valuation allowance	(9,000,000)	(8,000,000)	76,000,000
Valuation allowance, deferred tax asset, change in amount	28,000,000
Change in valuation allowance primarily related to the increase in deferred tax assets for pension and other post retirement benefits	112,000,000
Change in valuation allowance related to current taxable earnings	47,000,000
Change in valuation allowance resulting from discrete items	37,000,000
Net deferred tax assets	1,000,000	3,000,000
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Approximate federal net operating loss carryforwards	1,898,000,000
Approximate federal alternative minimum tax credit carryforwards	46,000,000
Minimum taxable income needed to fully realize the U.S. federal net deferred tax assets	2,028,000,000
Foreign tax credit carryforwards	8,000,000
Approximate gross deferred tax assets operating loss and tax credit carry forwards that will expire in current year	1,000,000
Percentage of change in ownership	50.00%
Period of change in ownership	3 years
Long-term tax-exempt rate	2.80%
Time period after the change in which amount of the limitation be increased or decreased by built-in gains or losses	5 years
Annual U.S. federal NOL utilization	113,000,000
Income Tax Penalties and Interest [Abstract]
Total amounts of tax penalties and interest expense recognized on consolidated balance sheet	3,000,000	2,000,000
Total amounts of interest and penalties recognized in consolidated statements of operations	0	0	1,000,000
Total amount of unrecognized tax benefit that would affect our effective tax rate	5,000,000	7,000,000	7,000,000
Income tax examinations, possible period for resolution	12 months
Estimated lower range for change in gross unrecognized tax benefit	0
Estimated upper range for change in gross unrecognized tax benefit	6,000,000
Undistributed earnings	540,000,000
Estimate of the amount of deferred tax liability	12,000,000
Minimum
Income Tax Penalties and Interest [Abstract]
Period of statutes of limitations	3 years
Maximum
Income Tax Penalties and Interest [Abstract]
Period of statutes of limitations	5 years
Federal
Valuation Allowance [Abstract]
Valuation allowance	773,000,000
State
Valuation Allowance [Abstract]
Valuation allowance	249,000,000
Foreign
Valuation Allowance [Abstract]
Valuation allowance	$ 1,000,000