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Debt - Components (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Short-term debt:    
Total short-term debt $ 918 $ 1,715
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $69 and $76, respectively 9,881 9,874
Other long-term debt 608 250
Total long-term debt 10,489 10,124
Total debt 11,407 11,839
Other long-term debt    
Long-term debt:    
Other long-term debt $ 3 $ 3
Commercial paper notes    
Long-term debt:    
Weighted average interest rate, long-term 2.40% 1.60%
Other long-term debt $ 605 $ 247
Senior notes    
Long-term debt:    
Unamortized discounts and debt issuance costs 69 76
Senior notes, net of unamortized discounts and debt issuance costs of $69 and $76, respectively 9,881 9,874
Debt instrument face value $ 9,900 $ 10,300
Commercial paper notes    
Short-term debt:    
Weighted average interest rate, short-term 2.40% 1.60%
Short-term debt $ 93 $ 563
Other    
Short-term debt:    
Total short-term debt $ 72 $ 2
Senior secured hedged inventory facility | Credit facility    
Short-term debt:    
Weighted average interest rate, short-term 2.30% 1.80%
Short-term debt $ 753 $ 750
6.13% senior notes due January 2017 | Senior notes    
Short-term debt:    
Senior notes, current   $ 400
Long-term debt:    
Debt instrument, interest rate   6.13%
6.50% senior notes due May 2018 | Senior notes    
Long-term debt:    
Debt instrument face value $ 600  
Debt instrument, interest rate 6.50%  
Exchange Traded    
Short-term debt:    
Total short-term debt $ 194 $ 410
Level 2 | Senior notes    
Long-term debt:    
Debt instrument fair value $ 10,000 $ 10,400