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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
state
Mar. 31, 2013
Mar. 31, 2014
Change in Estimates of Economic Lives of Property, Plant and Equipment [Member]
Dec. 31, 2014
Forecast
Change in Estimates of Economic Lives of Property, Plant and Equipment [Member]
Change in Accounting Estimate [Line Items]        
Number of states in which entity operates (states) 14      
Depreciation     $ 5 $ 20
Net Income $ (253) $ (264) $ 3 $ 12