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Segment Information
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
We have two reportable segments: Refining & Marketing and Midstream. Each of these segments is organized and managed based upon the nature of the products and services it offers.
•Refining & Marketing – refines crude oil and other feedstocks, including renewable feedstocks, at our refineries in the Gulf Coast, Mid-Continent and West Coast regions of the United States, purchases refined products and ethanol for resale and distributes refined products, including renewable diesel, through transportation, storage, distribution and marketing services provided largely by our Midstream segment. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to independent entrepreneurs who operate primarily Marathon® branded outlets and through long-term fuel supply contracts with direct dealers who operate locations mainly under the ARCO® brand.
•Midstream – gathers, transports, stores and distributes crude oil, refined products, including renewable diesel, and other hydrocarbon-based products principally for the Refining & Marketing segment via refining logistics assets, pipelines, terminals, towboats and barges; gathers, processes and transports natural gas; and transports, fractionates, stores and markets NGLs. The Midstream segment primarily reflects the results of MPLX.
Our chief operating decision maker (“CODM”) evaluates the performance of our segments using segment adjusted EBITDA. Our CODM is the chief executive officer. Amounts included in income before income taxes and excluded from segment adjusted EBITDA include: (i) depreciation and amortization; (ii) net interest and other financial costs; (iii) turnaround expenses; and (iv) other adjustments as deemed necessary. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) not tied to the operational performance of the segment. Assets by segment are not a measure used to assess the performance of the company by the CODM and thus are not reported in our disclosures.

Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2024202320242023
Segment adjusted EBITDA for reportable segments
Refining & Marketing$1,053 $4,373 $4,899 $11,389 
Midstream1,628 1,539 4,837 4,601 
Total reportable segments$2,681 $5,912 $9,736 $15,990 
Reconciliation of segment adjusted EBITDA for reportable segments to income before income taxes
Total reportable segments$2,681 $5,912 $9,736 $15,990 
Corporate(196)(204)(600)(533)
Refining planned turnaround costs(290)(153)(1,121)(902)
Garyville incident response costs— (63)— (63)
Gain on sale of assets(a)
— 106 151 106 
Depreciation and amortization(846)(845)(2,511)(2,479)
Net interest and other financial costs(221)(118)(594)(414)
Income before income taxes$1,128 $4,635 $5,061 $11,705 
(a)The first nine months of 2024 includes the gain from the Whistler Joint Venture Transaction (as defined in Note 13). 2023 includes the gain on the sale of our interest in South Texas Gateway Terminal LLC. See Note 13 for additional information.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2024202320242023
Sales and other operating revenues
Refining & Marketing
Revenues from external customers(a)
$33,775 $39,625 $101,914 $108,455 
Intersegment revenues36 30 107 78 
Refining & Marketing segment revenues33,811 39,655 102,021 108,533 
Midstream
Revenues from external customers(a)
1,332 1,292 3,813 3,669 
Intersegment revenues1,468 1,434 4,319 4,143 
Midstream segment revenues2,800 2,726 8,132 7,812 
Total segment revenues36,611 42,381 110,153 116,345 
Less: intersegment revenues1,504 1,464 4,426 4,221 
Consolidated sales and other operating revenues(a)
$35,107 $40,917 $105,727 $112,124 
(a)    Includes sales to related parties. See Note 6 for additional information.

Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2024202320242023
Income from equity method investments
Refining & Marketing$43 $24 $85 $5 
Midstream176 191 560 542 
Total segment income from equity method investments219 215 645 547 
Corporate(a)
— — 151 — 
Consolidated income from equity method investments$219 $215 $796 $547 
Depreciation and amortization
Refining & Marketing465 463 1,395 1,411 
Midstream353 340 1,041 988 
Total segment depreciation and amortization818 803 2,436 2,399 
Corporate28 42 75 80 
Consolidated depreciation and amortization$846 $845 $2,511 $2,479 
Capital expenditures
Refining & Marketing$372 $255 $967 $919 
Midstream557 234 1,125 748 
Total segment capital expenditures and investments929 489 2,092 1,667 
Less investments in equity method investees271 66 450 362 
Plus:
Corporate7 24 25 64 
Capitalized interest14 9 38 43 
Consolidated capital expenditures(b)
$679 $456 $1,705 $1,412 
(a)2024 represents the gain from the Whistler Joint Venture Transaction. See Note 13 for additional information.
(b)Includes changes in capital expenditure accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2024 and 2023 as reported in the consolidated statements of cash flows.