Inventory (Policies)	3 Months Ended
Inventory (Policies)	Mar. 31, 2026
Inventory Disclosure [Abstract]
Inventory, Policy	Fuel inventories included balances stated at the lower of cost or market using the LIFO method. As of March 31, 2026 and December 31, 2025, the Partnership’s fuel inventory balance included lower of cost or market reserves of $1 million and $472 million, respectively. For the three months ended March 31, 2026 and 2025, the Partnership's cost of sales included favorable LIFO inventory valuation adjustments of $444 million and $61 million, respectively, which increased net income.

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.