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Inventory, Linefill and Long-term Inventory (Details)
bbl in Thousands, $ in Millions
Sep. 30, 2025
USD ($)
$ / bbl
bbl
Dec. 31, 2024
USD ($)
$ / bbl
bbl
Inventory by category    
Inventory subtotal, carrying value $ 184 $ 261
Linefill subtotal, carrying value 933 904
Long-term inventory subtotal, carrying value 227 242
Total $ 1,344 $ 1,407
Crude oil    
Inventory by category    
Inventory, volumes (in barrels) | bbl 2,021 3,321
Linefill, volumes (in barrels) | bbl 15,762 15,463
Long-term inventory, volumes (in barrels) | bbl 3,640 3,413
Inventory subtotal, carrying value $ 122 $ 221
Linefill subtotal, carrying value 932 903
Long-term inventory subtotal, carrying value $ 226 $ 238
Inventory (price/unit of measure) (usd per barrel) | $ / bbl 60.37 66.55
Linefill (price/unit of measure) (usd per barrel) | $ / bbl 59.13 58.40
Long-term inventory (price/unit of measure (usd per barrel) | $ / bbl 62.09 69.73
NGL    
Inventory by category    
Inventory, volumes (in barrels) | bbl 1,035 603
Linefill, volumes (in barrels) | bbl 32 32
Long-term inventory, volumes (in barrels) | bbl 26 90
Inventory subtotal, carrying value $ 51 $ 26
Linefill subtotal, carrying value 1 1
Long-term inventory subtotal, carrying value $ 1 $ 4
Inventory (price/unit of measure) (usd per barrel) | $ / bbl 49.28 43.12
Linefill (price/unit of measure) (usd per barrel) | $ / bbl 31.25 31.25
Long-term inventory (price/unit of measure (usd per barrel) | $ / bbl 38.46 44.44
Other    
Inventory by category    
Inventory subtotal, carrying value $ 11 $ 14