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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Internal Revenue Service (IRS) [Member]
 
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards $ 1,007
State and Local Jurisdiction [Member]
 
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards 880
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount $ 26
Minimum [Member] | Internal Revenue Service (IRS) [Member]
 
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2018
Minimum [Member] | State and Local Jurisdiction [Member]
 
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2013
Maximum [Member] | Internal Revenue Service (IRS) [Member]
 
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2032
Maximum [Member] | State and Local Jurisdiction [Member]
 
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2032