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Acquisitions and Divestitures (Divestitures) (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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 |

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