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Acquisitions and Divestitures (Divestitures) (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax gain (loss) on the divestiture $ 0 $ 13 $ 7
Interest In Local Exchanges Minimum     5.00%
McGraw Hill Information And Media [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax gain (loss) on the divestiture     7
C&C [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Pre-tax gain (loss) on the divestiture   $ 13