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Commitments and Contingencies (Details Textual) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended |  |
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Jun. 29, 2012 | Dec. 31, 2012 USD ($) | Dec. 31, 2011 | Dec. 31, 2003 USD ($) | Dec. 31, 2012 S&P/DJ Indices [Member] USD ($) | Jun. 29, 2012 Parmalat [Member] USD ($) | Jun. 29, 2012 Parmalat [Member] EUR (€) | Jun. 30, 2006 Parmalat [Member] analysts | Dec. 31, 2012 Parmalat [Member] | Dec. 31, 2003 Parmalat [Member] EUR (€) | Sep. 14, 2010 Reed Construction Data, Inc. v. The McGraw-Hill Companies [Member] claims | Jan. 22, 2012 Reed Construction Data, Inc. v. The McGraw-Hill Companies [Member] claims | Oct. 08, 2009 Reed Construction Data, Inc. v. The McGraw-Hill Companies [Member] claims
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of equity investment in Rock-McGraw, Inc., percentage |  |  |  | 45.00% |  |  |  |  |  |  |  |  |
Percentage of leased building space, company |  | 17.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from the disposition of equity investment in Rock-McGraw |  |  |  | $ 382,000,000 |  |  |  |  |  |  |  |  |
Pre-tax gain from Sale of equity investment in Rock-McGraw |  |  |  | 131,000,000 |  |  |  |  |  |  |  |  |
After-tax gain from Sale of equity investment in Rock-McGraw |  |  |  | 58,000,000 |  |  |  |  |  |  |  |  |
Pre-tax gain pursuant to sale-leaseback accounting rules |  |  |  | 212,000,000 |  |  |  |  |  |  |  |  |
After-tax gain pursuant to sale-leaseback accounting rules |  |  |  | 126,000,000 |  |  |  |  |  |  |  |  |
Deferred gain |  | 123,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Deferred Gain, Amortized During Period |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Interest Expense |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Revenue from Related Parties |  |  |  |  | 21,000,000 |  |  |  |  |  |  |  |
Percentage Of Interest In Joint Venture | 73.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |
Damages claimed |  |  |  |  |  |  |  |  |  | 4,073,984,120 |  |  |
Rating fees paid |  |  |  |  |  | 1,100,000 | 784,000 |  |  |  |  |  |
Reimbursement of trial costs |  |  |  |  |  |  | 47,390 |  |  |  |  |  |
Fees paid to Court appointed experts to be reimbursed |  |  |  |  |  | $ 100,000 | € 67,797 |  |  |  |  |  |
Deadline to file an appeal |  |  | The deadline for any party to file an appeal is the earlier of one year and 45 daysfrom the date the judgment was issued or 30 days after any party serves a copy of the judgment on another party. |  |  |  |  |  |  |  |  |  |
Number of days before date of hearing to file appeal |  |  |  |  |  |  |  |  | 20 days |  |  |  |
Number of analysts served notice of completion |  |  |  |  |  |  |  | 8 |  |  |  |  |
Number of claims motioned to be dismissed |  |  |  |  |  |  |  |  |  |  | 5 | 5 | 5
Number of claims filed |  |  |  |  |  |  |  |  |  |  |  | 11 | 11
Number of claims dismissed |  |  |  |  |  |  |  |  |  |  | 3 |  |

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