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Inventory, Linefill and Long-term Inventory (Details)
bbl in Thousands, $ in Millions
Sep. 30, 2023
USD ($)
$ / bbl
bbl
Dec. 31, 2022
USD ($)
$ / bbl
bbl
Inventory by category    
Inventory subtotal, carrying value $ 617 $ 729
Linefill subtotal, carrying value 957 961
Long-term inventory subtotal, carrying value 327 284
Total $ 1,901 $ 1,974
Crude oil    
Inventory by category    
Inventory, volumes (in barrels) | bbl 4,491 6,713
Linefill, volumes (in barrels) | bbl 15,255 15,480
Long-term inventory, volumes (in barrels) | bbl 3,254 3,102
Inventory subtotal, carrying value $ 366 $ 452
Linefill subtotal, carrying value 891 906
Long-term inventory subtotal, carrying value $ 290 $ 246
Inventory (price/unit of measure) (usd per unit) | $ / bbl 81.50 67.33
Linefill (price/unit of measure) (usd per unit) | $ / bbl 58.41 58.53
Long-term inventory (price/unit of measure) (usd per unit) | $ / bbl 89.12 79.30
NGL    
Inventory by category    
Inventory, volumes (in barrels) | bbl 9,107 7,285
Linefill, volumes (in barrels) | bbl 2,195 1,876
Long-term inventory, volumes (in barrels) | bbl 1,326 1,066
Inventory subtotal, carrying value $ 242 $ 270
Linefill subtotal, carrying value 66 55
Long-term inventory subtotal, carrying value $ 37 $ 38
Inventory (price/unit of measure) (usd per unit) | $ / bbl 26.57 37.06
Linefill (price/unit of measure) (usd per unit) | $ / bbl 30.07 29.32
Long-term inventory (price/unit of measure) (usd per unit) | $ / bbl 27.90 35.65
Other    
Inventory by category    
Inventory subtotal, carrying value $ 9 $ 7