Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014 state	Jun. 30, 2013	Jun. 30, 2014 state	Jun. 30, 2013	Jun. 30, 2014 Change in Estimates of Economic Lives of Property, Plant and Equipment [Member]	Jun. 30, 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]
Geographic Areas, Revenues from External Customers [Abstract]
Number of states in which entity operates (states)	14		14
Change in Accounting Estimate [Line Items]
Depreciation					$ 5	$ 10	$ 20
Net Income	(256)	(246)	(509)	(510)	3	6	12
Property, Plant and Equipment Impairment or Disposal [Abstract]
Impairment of Real Estate	$ 16		$ 16