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Subsequent Events (Details) (Subsequent Event, USD $)
In Millions, unless otherwise specified
0 Months Ended
Feb. 18, 2014
Jan. 22, 2014
Lansing Trade Group, LLC
Jan. 21, 2014
Lansing Trade Group, LLC
Subsequent Event [Line Items]      
Stock split, conversion ratio 1.5    
Proceeds from sale of equity method investment   $ 60  
Percentage of company ownership interest (percentage)   40.00% 50.00%
Realized gain on disposal of LTG   17  
Realized gain on disposal, net of tax   $ 11