Inventory, Linefill and Long-term Inventory - Components of Inventory, Linefill and Long-term Inventory (Details) bbl in Thousands, $ in Millions	Dec. 31, 2023 USD ($) $ / bbl bbl	Dec. 31, 2022 USD ($) $ / bbl bbl
Inventory by category
Inventory subtotal, carrying value	$ 548	$ 729
Linefill subtotal, carrying value	976	961
Long-term inventory subtotal, carrying value	265	284
Total	$ 1,789	$ 1,974
Crude oil
Inventory by category
Inventory, Volumes (in barrels) | bbl	5,877	6,713
Linefill, Volumes (in barrels) | bbl	15,409	15,480
Long-term inventory, Volumes (in barrels) | bbl	3,256	3,102
Inventory subtotal, carrying value	$ 383	$ 452
Linefill subtotal, carrying value	909	906
Long-term inventory subtotal, carrying value	$ 232	$ 246
Inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl	65.17	67.33
Linefill (Price/Unit of measure) (in dollars per unit) | $ / bbl	58.99	58.53
Long-term inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl	71.25	79.30
NGL
Inventory by category
Inventory, Volumes (in barrels) | bbl	5,957	7,285
Linefill, Volumes (in barrels) | bbl	2,168	1,876
Long-term inventory, Volumes (in barrels) | bbl	1,326	1,066
Inventory subtotal, carrying value	$ 154	$ 270
Linefill subtotal, carrying value	67	55
Long-term inventory subtotal, carrying value	$ 33	$ 38
Inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl	25.85	37.06
Linefill (Price/Unit of measure) (in dollars per unit) | $ / bbl	30.90	29.32
Long-term inventory (Price/Unit of measure) (in dollars per unit) | $ / bbl	24.89	35.65
Other
Inventory by category
Inventory subtotal, carrying value	$ 11	$ 7