Investments, Loans and Long-Term Receivables - Schedule of Excess (deficit) of Carrying Value over (under) Underlying Equity (Details) - USD ($) $ in Millions	Dec. 31, 2025	Oct. 01, 2025	Sep. 30, 2025	Dec. 31, 2024
WRB Refining LP
Schedule of Equity Method Investments [Line Items]
Ownership interest acquired (as a percent)		50.00%	50.00%
Gulf Coast Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Excess (deficit) of Carrying Value over (under) Underlying Equity in Unconsolidated Affiliates	$ 0			$ 393
Front Range Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Excess (deficit) of Carrying Value over (under) Underlying Equity in Unconsolidated Affiliates	264			280
WRB Refining LP
Schedule of Equity Method Investments [Line Items]
Excess (deficit) of Carrying Value over (under) Underlying Equity in Unconsolidated Affiliates	$ 0			$ (1,526)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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