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Debt - Components (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Short-term debt:    
Total short-term debt $ 943 $ 737
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $63 and $67, respectively 8,937 8,933
Other long-term debt 29 250
Total long-term debt 8,966 9,183
Total debt 9,909 9,920
Senior notes    
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $63 and $67, respectively 8,937 8,933
Unamortized discounts and debt issuance costs 63 67
Debt instrument face value 9,000 9,000
Other long-term debt    
Long-term debt:    
Other long-term debt 3 $ 3
Commercial paper notes    
Short-term debt:    
Short-term notes and borrowings $ 259  
Weighted average interest rate, short-term 3.10% 2.40%
Other    
Short-term debt:    
Total short-term debt $ 134 $ 73
Senior secured hedged inventory facility | Commercial paper notes    
Long-term debt:    
Other long-term debt   247
Senior secured hedged inventory facility | Credit facility    
Short-term debt:    
Short-term notes and borrowings $ 450 $ 664
Weighted average interest rate, short-term 3.10% 2.60%
Senior unsecured revolving credit facility | Credit facility    
Long-term debt:    
Other long-term debt $ 26  
Weighted average interest rate, long-term 3.40%  
Senior unsecured revolving credit facility | Credit facility    
Short-term debt:    
Short-term notes and borrowings $ 100  
Weighted average interest rate, short-term 3.40%  
Cash margin deposits    
Short-term debt:    
Short-term notes and borrowings $ 426 $ 212
Level 2 | Senior notes    
Long-term debt:    
Debt instrument fair value $ 8,700 $ 9,100