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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements Fair Values—Recurring The following tables present assets and liabilities accounted for at fair value on a recurring basis as of September 30, 2024 and December 31, 2023 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables.
| September 30, 2024
| Fair Value Hierarchy |  |  |  |  |  |
(Millions of dollars) | Level 1 |  | Level 2 |  | Level 3 |  | Netting and Collateral(a) |  | Net Carrying Value on Balance Sheet(b) |  | Collateral Pledged Not Offset
Assets: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 302 |  |  | $ | 1 |  |  | $ | — |  |  | $ | (282) |  |  | $ | 21 |  |  | $ | 36 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 295 |  |  | $ | — |  |  | $ | — |  |  | $ | (295) |  |  | $ | — |  |  | $ | — |
Embedded derivatives in commodity contracts | — |  |  | — |  |  | 69 |  |  | — |  |  | 69 |  |  | — |
| December 31, 2023
| Fair Value Hierarchy |  |  |  |  |  |
(Millions of dollars) | Level 1 |  | Level 2 |  | Level 3 |  | Netting and Collateral(a) |  | Net Carrying Value on Balance Sheet(b) |  | Collateral Pledged Not Offset
Assets: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 244 |  |  | $ | — |  |  | $ | — |  |  | $ | (220) |  |  | $ | 24 |  |  | $ | 73 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 249 |  |  | $ | — |  |  | $ | — |  |  | $ | (249) |  |  | $ | — |  |  | $ | — |
Embedded derivatives in commodity contracts | — |  |  | — |  |  | 61 |  |  | — |  |  | 61 |  |  | — |
(a)Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2024, cash collateral of $13 million was netted with mark-to-market derivative liabilities. As of December 31, 2023, cash collateral of $29 million was netted with mark-to-market derivative liabilities. (b)We have no derivative contracts which are subject to master netting arrangements reflected gross on the balance sheet. Level 2 instruments include over-the-counter fixed swaps to mitigate the price risks from MPLX’s sale of propane under certain percent-of-proceeds and keep-whole arrangements. The swap valuations are based on observable inputs in the form of forward prices based on Mount Belvieu propane forward spot prices and contain no significant unobservable inputs. Level 3 instruments relate to an embedded derivative liability for a natural gas purchase commitment embedded in a keep‑whole processing agreement. The fair value calculation for these Level 3 instruments at September 30, 2024 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.67 to $1.45 per gallon with a weighted average of $0.85 per gallon and (2) a 100 percent probability of renewal for the five-year term of the natural gas purchase commitment and related keep-whole processing agreement. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability. The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(Millions of dollars) | 2024 |  | 2023 |  | 2024 |  | 2023
Beginning balance | $ | 69 |  |  | $ | 53 |  |  | $ | 61 |  |  | $ | 61 |
Unrealized and realized loss included in net income(a) | 3 |  |  | 10 |  |  | 18 |  |  | 7 |
Settlements of derivative instruments | (3) |  |  | (3) |  |  | (10) |  |  | (8) |
Ending balance | $ | 69 |  |  | $ | 60 |  |  | $ | 69 |  |  | $ | 60 |
The amount of total loss for the period included in earnings attributable to the change in unrealized loss relating to liabilities still held at the end of period(a): | $ | 3 |  |  | $ | 9 |  |  | $ | 15 |  |  | $ | 6 |
(a) The loss is included in cost of revenues on the consolidated statements of income. Fair Values – Non-recurring Non-recurring fair value measurements and disclosures in 2024 relate to acquisitions and other transactions as discussed in Note 13. Fair Values – Reported We believe the carrying value of our other financial instruments, including cash and cash equivalents, receivables, accounts payable and certain accrued liabilities, approximate fair value. Our fair value assessment incorporates a variety of considerations, including the short-term duration of the instruments and the expected insignificance of bad debt expense, which includes an evaluation of counterparty credit risk. The borrowings under our revolving credit facilities, which include variable interest rates, approximate fair value. The fair value of our long-term debt is based on prices from recent trade activity and is categorized in level 3 of the fair value hierarchy. The carrying and fair values of our debt were approximately $27.9 billion and $26.9 billion at September 30, 2024, respectively, and approximately $27.0 billion and $25.5 billion at December 31, 2023, respectively. These carrying and fair values of our debt exclude the unamortized issuance costs, which are netted against our total debt.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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