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Summary of Significant Accounting Policies Foreign Currency - Devaluation (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
VEB / $
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
VEB / $
Dec. 31, 2013
USD ($)
Feb. 13, 2013
VEB / $
Feb. 12, 2013
VEB / $
Impact of Foreign Currency Devaluation [Line Items]            
Currency Devaluation and Related Charges   $ 85 $ 245 $ 100    
Angola, Kwanza            
Impact of Foreign Currency Devaluation [Line Items]            
Currency Devaluation and Related Charges   39        
Net Monetary Asset Position   144        
Venezuelan Bolivar            
Impact of Foreign Currency Devaluation [Line Items]            
Currency Devaluation and Related Charges $ 245 26        
Currency devaluation expense     $ 245 $ 100    
Foreign Currency Exchange Rate, Translation | VEB / $         6.3 4.3
Argentina, Pesos            
Impact of Foreign Currency Devaluation [Line Items]            
Currency Devaluation and Related Charges   11        
Net Monetary Asset Position   42        
Kazakhstan, Tenge            
Impact of Foreign Currency Devaluation [Line Items]            
Currency Devaluation and Related Charges   $ 9        
SICAD II [Member] | Venezuelan Bolivar            
Impact of Foreign Currency Devaluation [Line Items]            
Foreign Currency Exchange Rate, Translation | VEB / $ 50   50