Acquisitions and Divestitures (Divestitures) (Details Textual) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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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]
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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]
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |||
Pre-tax gain (loss) on the divestiture | $ 13 |