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Significant Accounting Policies (Details)-K
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Significant Accounting Policies      
Number of countries in which the entity operates | item 23    
Stock-Based Compensation      
Compensation cost recognized for equity instruments for which employees do not render the required service | $ $ 15 $ 21 $ 11
Maximum      
Equity Method Investments      
General ownership percentage for equity method investments 50.00%    
Minimum      
Equity Method Investments      
General ownership percentage for equity method investments 20.00%