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Asset Sales And Discontinued Operations (Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pretax income from discontinued operations     $ 11 $ 2
Income tax expense      4   
Income from discontinued operations, net of tax expense 7   7 [1] 2 [2]
Panhandle [Member]
       
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating gain, before tax     11  
Operating gain     7  
CMS Viron [Member]
       
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating gain     $ 3  
[1] Includes an $11 million ($7 million net of tax) reversal of a loss on disposal due to the elimination of a liability associated with the 2003 sale of Panhandle.
[2] Includes an operating gain of $3 million related to a litigation settlement at CMS Viron.