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Debt - Components (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Short-term debt:    
Total short-term debt $ 1,456 $ 831
Long-term debt:    
Senior notes, net 8,326 9,071
Other long-term debt, net 63 311
Total long-term debt 8,389 9,382
Total debt 9,845 10,213
Senior notes    
Long-term debt:    
Senior notes, net 8,326 9,071
Unamortized discounts and debt issuance costs 57 62
Debt instrument face value 9,100 9,100
Other    
Long-term debt:    
Other long-term debt, net 63 112
Other    
Short-term debt:    
Total short-term debt 119 117
Commercial Paper | Line of Credit    
Short-term debt:    
Short-term debt $ 388 $ 547
Weighted average interest rate, short-term 0.40% 0.70%
Senior Secured Hedged Inventory Facility | Line of Credit    
Short-term debt:    
Short-term debt $ 0 $ 167
Weighted average interest rate, short-term 1.20% 1.20%
3.65% senior notes due June 2022 | Senior notes    
Short-term debt:    
Total short-term debt $ 750 $ 0
Stated percentage 3.65%  
GO Zone term loans    
Short-term debt:    
Debt issuance costs $ 1  
GO Zone term loans | Term loan    
Short-term debt:    
Debt issuance costs   1
Long-term debt:    
Other long-term debt, net 0 $ 199
Weighted average interest rate, long-term   1.30%
GO Zone term loans | Term loan    
Short-term debt:    
Total short-term debt $ 199 $ 0
Weighted average interest rate, short-term 1.30%  
Level 2 | Senior notes    
Long-term debt:    
Debt instrument fair value $ 10,000 $ 9,900