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Acquisitions (Narrative) (Details)
$ in Millions
1 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
CLP / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]            
Goodwill   $ 843 $ 833   $ 824 $ 831
AFP Habitat            
Business Acquisition [Line Items]            
Ownership interest percent       40.00%    
Share price (pesos per share) | CLP / shares       CLP 899.90    
Cash paid for business acquisition $ 532