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Summary of Significant Accounting Policies Major Customers and Credit Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]        
Concentration percentage   100.00% 100.00% 100.00%
Accounts receivable, current $ 1,781 $ 3,015    
Petroleos de Venezuela, S.A. [Member]        
Concentration Risk [Line Items]        
Bond face amount     $ 127  
Gain (loss) on sale of bonds     $ (58)  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Petroleos de Venezuela, S.A. [Member]        
Concentration Risk [Line Items]        
Accounts receivable, current 205      
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Petroleos Mexicanos [Member]        
Concentration Risk [Line Items]        
Accounts receivable, current $ 47      
Accounts Receivable [Member] | Latin America [Member] | Geographic Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration percentage 38.00%      
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration percentage 10.00% 10.00% 10.00%