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Investments Variable Interests (Details) - USD ($)
$ in Millions
Apr. 14, 2015
Jun. 30, 2015
Dec. 28, 2014
Jul. 29, 2014
Topix LLC | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Maximum loss exposure related to variable interests   $ 3 $ 3  
Taboola.com LTD        
Variable Interest Entity [Line Items]        
Ownership percentage in common stock       1.00%
Florida LLC [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]        
Variable Interest Entity [Line Items]        
FairValueofLandContributed $ 15      
CarryingValueofLandContributed $ 10      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 92.00%      
FutureOwnershipPercentage 85.00%