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Debt - Components (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Short-term debt:    
Total short-term debt $ 470 $ 66
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $55 and $59, respectively 8,945 8,941
Other long-term debt, net 231 202
Total long-term debt 9,176 9,143
Total debt 9,646 9,209
Senior notes    
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $55 and $59, respectively 8,945 8,941
Unamortized discounts and debt issuance costs 55 59
Debt instrument face value 9,000 9,000
Other    
Long-term debt:    
Other long-term debt, net 32 4
Commercial paper    
Short-term debt:    
Short-term debt $ 218  
Weighted average interest rate, short-term 3.00%  
Other    
Short-term debt:    
Total short-term debt $ 152 66
Senior secured hedged inventory facility | Line of credit    
Short-term debt:    
Short-term debt $ 100  
Weighted average interest rate, short-term 3.50%  
GO Zone term loans | Term loan    
Long-term debt:    
Other long-term debt, net $ 199 $ 198
Weighted average interest rate, long-term 3.20% 3.10%
Debt issuance costs $ 1 $ 2
5.75% Senior Notes Due In January 2020 | Senior notes    
Long-term debt:    
Debt instrument face value $ 500  
Stated percentage 5.75%  
2.60% Senior Notes Due In December 2019 | Senior notes    
Long-term debt:    
Debt instrument face value $ 500 $ 500
Stated percentage 2.60% 2.60%
Level 2 | Senior notes    
Long-term debt:    
Debt instrument fair value $ 9,300 $ 8,600