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Basis of Presentation and Significant Accounting Policies Principles of Consolidation and VIEs (Details) - USD ($)
$ in Millions
Nov. 12, 2015
Apr. 14, 2015
Dec. 27, 2013
Dec. 31, 2016
Cash     $ 2,816  
Taboola.com LTD        
Common stock owned by the Company, percent       1.00%
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Florida LLC        
Fair Value of Land Contributed   $ 15    
Carrying Value of Land Contributed   $ 10    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage   92.00%    
Future Ownership Percentage   85.00%    
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | California LLC        
Fair Value of Land Contributed $ 39      
Carrying Value of Land Contributed $ 35      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 90.00%      
Minimum        
Ownership in equity method investment, percent       20.00%
Maximum        
Ownership in equity method investment, percent       50.00%