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Acquisition Accounting Components of Intangible Assets (Details) (Super Media, Inc., USD $)
In Millions, unless otherwise specified
0 Months Ended
Apr. 30, 2013
Apr. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets $ 635 $ 635
Directory services agreements
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets   145
Estimated Remaining Useful Lives 5 years  
Client relationships
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets   420
Estimated Remaining Useful Lives 3 years  
Trademarks and domain names
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets   60
Estimated Remaining Useful Lives 5 years  
Patented technologies
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Fair value of intangible assets   $ 10
Estimated Remaining Useful Lives 4 years