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Acquisitions and Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Summary of Acquisitions

A summary of the acquisitions follows (in millions):

 

     Years Ended December 31,  
     2017      2016      2015  

Fair value of assets acquired, net of cash acquired

    $ 154      $ 357      $ 116  

Cash paid, net of cash acquired

      (86 )       (230 )       (86 ) 
  

 

 

     

 

 

     

 

 

  

Liabilities assumed, debt issued and noncontrolling interest

    $ 68      $ 127      $ 30  
  

 

 

     

 

 

     

 

 

  

Excess purchase price over fair value of net assets acquired

    $ 89      $ 74      $ 51