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Significant Accounting Policies (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Significant Accounting Policies [Line Items]        
Effective Income Tax Rate, Continuing Operations 29.00% 32.00% 30.00% 32.00%
Unrecognized Tax Benefits $ 3   $ 3  
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities     $ 1  
Time Period of Decrease in Unrecognized Tax Benefits     12 months  
Minimum [Member]
       
Significant Accounting Policies [Line Items]        
Finite Lived Asset Useful Life     3 years  
Maximum [Member]
       
Significant Accounting Policies [Line Items]        
Finite Lived Intangible Asset, Useful Life 1     28 years