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Inventory, Linefill and Long-term Inventory (Details)
bbl in Thousands, $ in Millions
Jun. 30, 2025
USD ($)
$ / bbl
bbl
Dec. 31, 2024
USD ($)
$ / bbl
bbl
Inventory by category    
Inventory subtotal, carrying value $ 151 $ 261
Linefill subtotal, carrying value 940 904
Long-term inventory subtotal, carrying value 234 242
Total $ 1,325 $ 1,407
Crude oil    
Inventory by category    
Inventory, volumes (in barrels) | bbl 1,640 3,321
Linefill, volumes (in barrels) | bbl 15,830 15,463
Long-term inventory, volumes (in barrels) | bbl 3,529 3,413
Inventory subtotal, carrying value $ 102 $ 221
Linefill subtotal, carrying value 939 903
Long-term inventory subtotal, carrying value $ 230 $ 238
Inventory (price/unit of measure) (usd per barrel) | $ / bbl 62.20 66.55
Linefill (price/unit of measure) (usd per barrel) | $ / bbl 59.32 58.40
Long-term inventory (price/unit of measure (usd per barrel) | $ / bbl 65.17 69.73
NGL    
Inventory by category    
Inventory, volumes (in barrels) | bbl 746 603
Linefill, volumes (in barrels) | bbl 33 32
Long-term inventory, volumes (in barrels) | bbl 90 90
Inventory subtotal, carrying value $ 39 $ 26
Linefill subtotal, carrying value 1 1
Long-term inventory subtotal, carrying value $ 4 $ 4
Inventory (price/unit of measure) (usd per barrel) | $ / bbl 52.28 43.12
Linefill (price/unit of measure) (usd per barrel) | $ / bbl 30.30 31.25
Long-term inventory (price/unit of measure (usd per barrel) | $ / bbl 44.44 44.44
Other    
Inventory by category    
Inventory subtotal, carrying value $ 10 $ 14