Income Taxes (Net Operating Loss Carryforwards and Tax Credit Carryforwards) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Internal Revenue Service (IRS) [Member]
Net Operating Loss Carryforwards	$ 997,000,000	$ 1,116,000,000
Tax Credit Carryforward	35,000,000	221,000,000
State and Local Jurisdiction [Member]
Net Operating Loss Carryforwards	2,594,000,000	2,958,000,000
Tax Credit Carryforward	$ 7,000,000	$ 7,000,000

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant