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Inventory, Linefill and Long-term Inventory (Details)
bbl in Thousands, $ in Millions
Mar. 31, 2024
USD ($)
$ / bbl
bbl
Dec. 31, 2023
USD ($)
$ / bbl
bbl
Inventory by category    
Inventory subtotal, carrying value $ 453 $ 548
Linefill subtotal, carrying value 981 976
Long-term inventory subtotal, carrying value 299 265
Total $ 1,733 $ 1,789
Crude oil    
Inventory by category    
Inventory, volumes (in barrels) | bbl 5,578 5,877
Linefill, volumes (in barrels) | bbl 15,541 15,409
Long-term inventory, volumes (in barrels) | bbl 3,279 3,256
Inventory subtotal, carrying value $ 374 $ 383
Linefill subtotal, carrying value 914 909
Long-term inventory subtotal, carrying value $ 262 $ 232
Inventory (price/unit of measure) (usd per unit) | $ / bbl 67.05 65.17
Linefill (price/unit of measure) (usd per unit) | $ / bbl 58.81 58.99
Long-term inventory (price/unit of measure) (usd per unit) | $ / bbl 79.90 71.25
NGL    
Inventory by category    
Inventory, volumes (in barrels) | bbl 2,604 5,957
Linefill, volumes (in barrels) | bbl 2,242 2,168
Long-term inventory, volumes (in barrels) | bbl 1,325 1,326
Inventory subtotal, carrying value $ 68 $ 154
Linefill subtotal, carrying value 67 67
Long-term inventory subtotal, carrying value $ 37 $ 33
Inventory (price/unit of measure) (usd per unit) | $ / bbl 26.11 25.85
Linefill (price/unit of measure) (usd per unit) | $ / bbl 29.88 30.90
Long-term inventory (price/unit of measure) (usd per unit) | $ / bbl 27.92 24.89
Other    
Inventory by category    
Inventory subtotal, carrying value $ 11 $ 11