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Debt - Components (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Short-term debt:    
Total short-term debt $ 429 $ 737
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $61 and $67, respectively 8,939 8,933
Other long-term debt, net 201 250
Total long-term debt 9,140 9,183
Total debt 9,569 9,920
Senior notes    
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $61 and $67, respectively 8,939 8,933
Unamortized discounts and debt issuance costs 61 67
Debt instrument face value 9,000 9,000
Other long-term debt    
Long-term debt:    
Other long-term debt, net 3 3
Commercial paper notes    
Short-term debt:    
Short-term notes and borrowings $ 60  
Weighted average interest rate, short-term 3.30%  
Other    
Short-term debt:    
Total short-term debt $ 69 73
Senior secured hedged inventory facility | Commercial paper notes    
Long-term debt:    
Other long-term debt, net   247
Senior secured hedged inventory facility | Credit facility    
Short-term debt:    
Short-term notes and borrowings $ 300 $ 664
Weighted average interest rate, short-term 3.20% 2.60%
GO Zone term loans | Term loan    
Long-term debt:    
Other long-term debt, net $ 198  
Weighted average interest rate, long-term 2.90%  
Debt issuance costs $ 2  
Level 2 | Senior notes    
Long-term debt:    
Debt instrument fair value $ 8,800 $ 9,100