Income Taxes (Net Operating Loss Carryforwards) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 30	$ 54
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	1,485	1,600
Operating Loss Carryforwards, Valuation allowance	$ 21	$ 21

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 17
-Subparagraph e

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant