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Derivative and Hedging Activities - Fair Value of Recurring Assets and Liabilities Table (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net $ (177) $ 512 $ 512  
Commodity Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset 32   381  
Derivative Liability (153)   (114)  
Derivative Assets (Liabilities), at Fair Value, Net (121) 267    
Foreign Exchange Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Liability (56)   (52)  
Supply Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset     297  
Fair Value, Inputs, Level 1 [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 0   0  
Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset 0   0  
Derivative Liability 0   0  
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Liability 0   0  
Fair Value, Inputs, Level 1 [Member] | Supply Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset     0  
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net (147)   306  
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset 32   372  
Derivative Liability (123)   (14)  
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Liability (56)   (52)  
Fair Value, Inputs, Level 2 [Member] | Supply Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset     0  
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net (30)   206  
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset 0   9  
Derivative Liability (30)   (100)  
Derivative Assets (Liabilities), at Fair Value, Net (30) (91) (77) $ (54)
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Liability 0   0  
Fair Value, Inputs, Level 3 [Member] | Supply Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset     297  
Derivative Assets (Liabilities), at Fair Value, Net $ 0 $ 297 $ 291 $ 1