Cash and Cash Equivalents (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Abstract]
Increase (Decrease) in Accounts Receivable	$ 212	$ (212)	$ 34
Increase (Decrease) in Accounts Receivable, Related Parties	0	20	(5)
Inventories, net	(275)	(265)	(182)
Increase (Decrease) in Other Current Assets	(30)	43	47
Increase (Decrease) in Other Noncurrent Assets	(255)	357	(101)
Accounts payable	129	29	61
Increase (Decrease) in Accounts Payable, Related Parties	(86)	(66)	43
Increase (Decrease) in Other Accrued Liabilities	(76)	(106)	(18)
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital	(381)	(200)	(121)
Cash and Cash Equivalents [Line Items]
Senior notes redeemed and issued in an exchange transaction	3,654	0	0
Interest Paid, Excluding Capitalized Interest, Operating Activity	434	339	202
Joint Venture Formation, Fair Value of Joint Venture	0	1,159	0
Lease assets obtained in exchange for new lease liabilities	280	3	0
NuStar Acquisition
Cash and Cash Equivalents [Line Items]
Stock Issued During Period, Value, Acquisitions	$ 4,038	$ 2,850	$ 0

Amount of increase in right-of-use asset obtained in exchange for operating and finance lease liabilities.

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The amount of senior notes redeemed and issued in an exchange transaction during the period.

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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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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in the obligations due for goods and services provided by the following types of related parties: a parent company and its subsidiaries, subsidiaries of a common parent, an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the amount due to the reporting entity for good and services provided to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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Amount of increase (decrease) in asset and (increase) decrease in liability, used in operating activity in reconciling net income to reflect cash provided by (used in) operating activity when indirect cash flow method is applied.

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The increase (decrease) during the reporting period in other expenses incurred but not yet paid.

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Amount of increase (decrease) in current assets classified as other.

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Amount of increase (decrease) in noncurrent assets classified as other.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Fair value of joint venture at its formation date.

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Value of stock issued pursuant to acquisitions during the period.

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