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Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense $ 26 [1] $ 23 [1] $ 73 [1] $ 63 [1]
Stock option expense
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense 4 2 10 9
Restricted stock and unit awards expense
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense 22 21 63 54
MHE
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense       3 [1]
MHE | Stock option expense
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation expense   $ 1    
[1] Included in total stock-based compensation expense are amounts related to employees at the Company's corporate offices who transferred to MHE of $1 million and $3 million for the three and nine months ended September 30, 2012, respectively.