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Supplemental Oil and Gas Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2025
Oil and Gas Disclosure [Abstract]  
Schedule of Proved Reserves Based on Average Prices
Equivalents
(Millions of barrels of oil equivalent)
TotalUnited
States		CanadaOther
Proved developed and undeveloped reserves:
December 31, 2022715.4 357.0 357.8 0.6 
Revisions of previous estimates(13.3)(13.3)0.2 (0.2)
Improved recovery0.4 — 0.4 — 
Extensions and discoveries112.6 12.7 87.3 12.6 
Sale of properties(5.2)— (5.2)— 
Production(70.4)(45.3)(25.0)(0.1)
December 31, 2023739.5 311.1 415.5 12.9 
Revisions of previous estimates14.3 8.1 6.3 (0.1)
Improved recovery11.3 11.3 — — 
Extensions and discoveries31.4 16.0 15.4 — 
Production(67.5)(39.1)(28.3)(0.1)
December 31, 2024729.0 307.4 408.9 12.7 
Revisions of previous estimates26.0 18.0 7.1 0.9 
Extensions and discoveries43.0 4.9 38.1 — 
Purchases of properties4.3 4.3 — — 
Sale of properties(3.4)(3.4)— — 
Production(68.9)(39.3)(29.5)(0.1)
December 31, 2025 ¹730.0 291.9 424.6 13.5 
Proved developed reserves:
December 31, 2022436.0 264.2 171.3 0.5 
December 31, 2023425.5 223.2 202.0 0.3 
December 31, 2024436.2 218.9 217.1 0.2 
December 31, 2025 ²418.9 197.8 220.9 0.2 
Proved undeveloped reserves:
December 31, 2022279.4 92.8 186.5 0.1 
December 31, 2023314.0 87.9 213.5 12.6 
December 31, 2024292.8 88.5 191.8 12.5 
December 31, 2025 ³311.1 94.1 203.7 13.3 
1  Total and United States includes proved reserves of 15.0 MMBOE, consisting of 13.9 MMBBL of oil, 0.4 MMBBL of NGLs and 4.2 BCF of natural gas attributable to the noncontrolling interest in MP GOM.
2 Total and United States includes proved developed reserves of 13.1 MMBOE, consisting of 12.1 MMBBL of oil, 0.4 MMBBL of NGLs and 3.9 BCF of natural gas attributable to the noncontrolling interest in MP GOM.
3 Total and United States includes proved undeveloped reserves of 1.9 MMBOE, consisting of 1.8 MMBBL of oil and 0.3 BCF of natural gas attributable to the noncontrolling interest in MP GOM.
(Millions of barrels)
TotalUnited
States		CanadaOther
Proved developed and undeveloped crude oil reserves:
December 31, 2022303.6 263.6 39.5 0.5 
Revisions of previous estimates(10.8)(8.9)(1.8)(0.1)
Improved recovery0.4 — 0.4 — 
Extensions and discoveries22.5 8.9 1.5 12.1 
Sale of properties
(2.0)— (2.0)— 
Production(37.9)(35.6)(2.2)(0.1)
December 31, 2023275.8 228.0 35.4 12.4 
Revisions of previous estimates6.6 6.6 0.1 (0.1)
Improved recovery10.7 10.7 – — 
Extensions and discoveries16.6 10.7 5.9 – 
Production(34.6)(30.8)(3.7)(0.1)
December 31, 2024275.1 225.2 37.7 12.2 
Revisions of previous estimates20.2 18.2 1.8 0.2 
Extensions and discoveries5.7 3.4 2.3 — 
Purchases of properties3.5 3.5 – – 
Sales of properties(1.8)(1.8)— – 
Production(34.0)(30.3)(3.6)(0.1)
December 31, 2025 ¹268.7 218.2 38.2 12.3 
Proved developed crude oil reserves:
December 31, 2022209.0 194.4 14.2 0.4 
December 31, 2023186.3 163.7 22.3 0.3 
December 31, 2024184.7 164.1 20.4 0.2 
December 31, 2025 ²173.1 150.8 22.1 0.2 
Proved undeveloped crude oil reserves:
December 31, 202294.6 69.2 25.3 0.1 
December 31, 202389.5 64.3 13.1 12.1 
December 31, 202490.4 61.1 17.3 12.0 
December 31, 2025 ³95.6 67.4 16.1 12.1 
1 Total and United States includes proved reserves of 13.9 MMBBL attributable to the noncontrolling interest in MP GOM.
2 Total and United States includes proved developed reserves of 12.1 MMBBL attributable to the noncontrolling interest in MP GOM.
3 Total and United States includes proved undeveloped reserves of 1.8 MMBBL attributable to the noncontrolling interest in MP GOM.
(Millions of barrels)
TotalUnited
States		Canada Other
Proved developed and undeveloped NGL reserves:
December 31, 202241.7 37.6 4.1 — 
Revisions of previous estimates(1.4)(1.2)(0.2)— 
Extensions and discoveries2.0 1.7 0.3 — 
Sale of properties
(0.6)— (0.6)— 
Production(4.1)(3.8)(0.3)— 
December 31, 202337.6 34.3 3.3 — 
Revisions of previous estimates1.2 0.3 0.9 — 
Improved recovery0.4 0.4 — — 
Extensions and discoveries2.9 2.4 0.5 — 
Production(3.5)(3.3)(0.2)— 
December 31, 202438.6 34.1 4.5 — 
Revisions of previous estimates1.4 1.2 0.2 — 
Extensions and discoveries1.1 0.7 0.4 — 
Purchases of properties0.4 0.4 – — 
Sale of properties
(0.8)(0.8)— — 
Production(4.0)(3.8)(0.2)— 
December 31, 2025 ¹36.7 31.8 4.9 — 
Proved developed NGL reserves:
December 31, 202229.7 27.4 2.3 — 
December 31, 202325.9 24.1 1.8 — 
December 31, 202424.1 21.9 2.2 — 
December 31, 2025 ²21.7 19.2 2.5 — 
Proved undeveloped NGL reserves:
December 31, 202212.0 10.2 1.8 — 
December 31, 202311.7 10.2 1.5 — 
December 31, 202414.5 12.2 2.3 — 
December 31, 2025 15.0 12.6 2.4 — 
1 Total and United States includes total proved reserves of 0.4 MMBBL attributable to the noncontrolling interest in MP GOM.
2 Total and United States includes proved developed reserves of 0.4 MMBBL attributable to the noncontrolling interest in MP GOM.
(Billions of cubic feet)
TotalUnited
States		CanadaOther
Proved developed and undeveloped natural gas reserves:    
December 31, 20222,219.9 334.9 1,884.8 0.2 
Revisions of previous estimates(6.9)(19.0)12.1 — 
Extensions and discoveries528.9 12.3 513.8 2.8 
Sale of properties
(15.6)— (15.6)— 
Production(170.1)(35.1)(135.0)— 
December 31, 20232,556.2 293.1 2,260.1 3.0 
Revisions of previous estimates39.1 7.7 31.4 — 
Improved recovery1.2 1.2 – — 
Extensions and discoveries71.4 17.0 54.4 — 
Production(176.1)(30.1)(146.0)— 
December 31, 20242,491.8 288.9 2,199.9 3.0 
Revisions of previous estimates26.7 (8.7)30.8 4.6 
Extensions and discoveries217.2 4.7 212.5 — 
Purchases of properties2.4 2.4 — — 
Sale of properties
(5.1)(5.1)— — 
Production(185.3)(31.0)(154.3)— 
December 31, 2025 1,2
2,547.7 251.2 2,288.9 7.6 
Proved developed natural gas reserves:
December 31, 20221,183.1 254.1 928.8 0.2 
December 31, 20231,279.3 212.4 1,066.7 0.2 
December 31, 20241,364.2 196.8 1,167.2 0.2 
December 31, 2025 2,3
1,345.1 166.4 1,178.5 0.2 
Proved undeveloped natural gas reserves:
December 31, 20221,036.8 80.8 956.0 — 
December 31, 20231,276.9 80.7 1,193.4 2.8 
December 31, 20241,127.6 92.1 1,032.7 2.8 
December 31, 2025 4
1,202.6 84.8 1,110.4 7.4 
1 Total and United States includes total proved reserves of 4.2 BCF attributable to the noncontrolling interest in MP GOM.
2 Includes proved natural gas reserves to be consumed in operations as fuel of 54.2 BCF, 35.1 BCF and 7.4 BCF for the U.S., Canada and Other, respectively, with 1.7 BCF attributable to the noncontrolling interest in MP GOM.
3 Total and United States includes proved developed reserves of 3.9 BCF attributable to the noncontrolling interest in MP GOM.
4 Total and United States includes proved undeveloped reserves of 0.3 BCF attributable to the noncontrolling interest in MP GOM.
Schedule of Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities
(Millions of dollars)
United
States
Canada
OtherTotal
Year ended December 31, 2025
Property acquisition costs
Unproved$5.5 $— $— $5.5 
Proved23.6 — — 23.6 
Total acquisition costs29.1 — — 29.1 
Exploration costs 71.6 0.3 144.3 216.2 
Development costs 696.2 152.5 102.9 951.6 
Total costs incurred796.9 152.8 247.2 1,196.9 
Charged to expense
Dry hole expense(0.9)— 31.0 30.1 
Geophysical and other costs34.3 0.3 35.3 69.9 
Total charged to expense 1
33.4 0.3 66.3 100.0 
Property additions$763.5 $152.5 $180.9 $1,096.9 
Year ended December 31, 2024
Property acquisition costs
Unproved$7.8 $0.2 $— $8.0 
Proved— — — — 
Total acquisition costs7.8 0.2 – 8.0 
Exploration costs 85.3 0.4 60.2 145.9 
Development costs 598.7 137.7 45.1 781.5 
Total costs incurred691.8 138.3 105.3 935.4 
Charged to expense
Dry hole expense70.9 — 2.3 73.2 
Geophysical and other costs19.2 0.4 31.2 50.8 
Total charged to expense 1
90.1 0.4 33.5 124.0 
Property additions$601.7 $137.9 $71.8 $811.4 
Year ended December 31, 2023
Property acquisition costs
Unproved$— $— $8.5 $8.5 
Proved12.8 — 14.3 27.1 
Total acquisition costs12.8 — 22.8 35.6 
Exploration costs 157.8 0.4 39.9 198.1 
Development costs 667.2 206.2 7.4 880.8 
Total costs incurred837.8 206.6 70.1 1,114.5 
Charged to expense
Dry hole expense153.1 — 16.7 169.8 
Geophysical and other costs13.4 0.4 40.3 54.1 
Total charged to expense 1
166.5 0.4 57.0 223.9 
Property additions$671.3 $206.2 $13.1 $890.6 
1 Excludes undeveloped lease amortization for the years ended 2025, 2024 and 2023 of $11.7 million, $9.6 million and $10.9 million, respectively.
Schedule of Results of Operations for Oil and Gas Producing Activities
(Millions of dollars)
United
States		CanadaOtherTotal
Year ended December 31, 2025    
Revenues    
Crude oil and natural gas liquids sales$2,047.4 $254.4 $5.7 $2,307.5 
Natural gas sales106.5 275.8 — 382.3 
Total oil and natural gas revenues2,153.9 530.2 5.7 2,689.8 
Other operating revenues5.9 1.7 10.0 17.6 
Total revenues2,159.8 531.9 15.7 2,707.4 
Costs and expenses
Lease operating expenses577.1 185.6 2.5 765.2 
Severance and ad valorem taxes37.7 1.5 — 39.2 
Transportation, gathering and processing107.0 92.7 — 199.7 
Exploration costs charged to expense33.5 0.3 66.2 100.0 
Undeveloped lease amortization7.5 0.1 4.1 11.7 
Depreciation, depletion and amortization822.1 144.8 2.5 969.4 
Accretion of asset retirement obligations46.6 10.3 0.7 57.6 
Impairment of assets115.0 — — 115.0 
Selling and general expenses13.7 23.7 8.8 46.2 
Other expenses (benefits)13.4 3.5 (0.4)16.5 
Total costs and expenses1,773.6 462.5 84.4 2,320.5 
Results of operations before taxes386.2 69.4 (68.7)386.9 
Income tax expense (benefit)77.7 14.6 (2.1)90.2 
Results of operations$308.5 $54.8 $(66.6)$296.7 
Year ended December 31, 2024
Revenues
Crude oil and natural gas liquids sales$2,436.0 $272.3 $6.6 $2,714.9 
Natural gas sales67.8 232.2 — 300.0 
Sales of purchased natural gas— 3.7 — 3.7 
Total oil and natural gas revenues2,503.8 508.2 6.6 3,018.6 
Other operating revenues4.5 1.5 — 6.0 
Total revenues2,508.3 509.7 6.6 3,024.5 
Costs and expenses
Lease operating expenses749.9 185.5 1.6 937.0 
Severance and ad valorem taxes37.8 1.4 — 39.2 
Transportation, gathering and processing130.9 79.9 — 210.8 
Costs of purchased natural gas— 3.1 — 3.1 
Exploration costs charged to expense90.0 0.4 33.5 123.9 
Undeveloped lease amortization6.2 0.1 3.3 9.6 
Depreciation, depletion and amortization709.2 146.0 1.7 856.9 
Accretion of asset retirement obligations43.1 8.6 0.7 52.4 
Impairment of assets62.9 — — 62.9 
Selling and general expenses(3.3)20.4 6.7 23.8 
Other expenses (benefits)(5.6)3.3 2.6 0.3 
Total costs and expenses1,821.1 448.7 50.1 2,319.9 
Results of operations before taxes687.2 61.0 (43.5)704.6 
Income tax expense (benefit)125.3 12.0 (31.0)106.3 
Results of operations$561.9 $49.0 $(12.5)$598.4 
1   Results exclude corporate overhead, interest and discontinued operations. Results include amounts attributable to the noncontrolling interest in MP GOM.
(Millions of dollars)
United
States		CanadaOtherTotal
Year ended December 31, 2023
Revenues
Crude oil and natural gas liquids sales$2,829.1 $165.7 $11.0 $3,005.8 
Natural gas sales92.7 278.2 — 370.9 
Sales of purchased natural gas
— 72.2 — 72.2 
Total oil and natural gas revenues2,921.8 516.1 11.0 3,448.9 
Other operating revenues6.5 1.4 — 7.9 
Total revenues2,928.3 517.5 11.0 3,456.8 
Costs and expenses
Lease operating expenses630.7 151.8 1.9 784.4 
Severance and ad valorem taxes41.4 1.4 — 42.8 
Transportation, gathering and processing157.0 76.0 — 233.0 
Costs of purchased natural gas— 51.7 — 51.7 
Exploration costs charged to expense166.5 0.4 57.0 223.9 
Undeveloped lease amortization8.1 0.1 2.7 10.9 
Depreciation, depletion and amortization706.0 142.2 2.3 850.5 
Accretion of asset retirement obligations37.8 7.8 0.4 46.0 
Selling and general expenses11.8 16.5 9.4 37.7 
Other expenses31.2 16.8 8.9 56.9 
Total costs and expenses1,790.5 464.7 82.6 2,337.8 
Results of operations before taxes1,137.8 52.8 (71.6)1,119.0 
Income tax expense (benefit)232.7 11.2 (6.1)237.8 
Results of operations$905.1 $41.6 $(65.5)$881.2 
1   Results exclude corporate overhead, interest and discontinued operations. Results include amounts attributable to the noncontrolling interest in MP GOM.
schedule of Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves
(Millions of dollars)
United
States		CanadaOther Total
December 31, 2025    
Future cash inflows$15,502.7 $6,850.9 $873.7 $23,227.3 
Future development costs(1,969.6)(812.6)(204.0)(2,986.2)
Future production costs(6,707.7)(4,240.9)(343.4)(11,292.0)
Future income taxes(602.4)(342.8)(176.2)(1,121.4)
Future net cash flows6,223.0 1,454.6 150.1 7,827.7 
10% annual discount for estimated timing of cash flows(2,459.4)(625.4)(118.7)(3,203.5)
Standardized measure of discounted future net cash flows$3,763.6 $829.2 $31.4 $4,624.2 
December 31, 2024
Future cash inflows$18,118.1 $6,304.4 $1,012.9 $25,435.4 
Future development costs(2,024.9)(825.9)(252.5)(3,103.3)
Future production costs(7,645.7)(4,026.5)(341.7)(12,013.9)
Future income taxes(893.5)(251.2)(203.4)(1,348.1)
Future net cash flows7,554.0 1,200.8 215.3 8,970.1 
10% annual discount for estimated timing of cash flows(2,887.3)(486.0)(200.9)(3,574.2)
Standardized measure of discounted future net cash flows$4,666.7 $714.8 $14.4 $5,395.9 
December 31, 2023
Future cash inflows$18,927.6 $8,012.7 $1,004.2 $27,944.5 
Future development costs(1,685.3)(769.6)(304.3)(2,759.2)
Future production costs(7,856.2)(4,223.6)(288.7)(12,368.5)
Future income taxes(1,057.5)(634.6)(121.3)(1,813.4)
Future net cash flows8,328.6 2,384.9 289.9 11,003.4 
10% annual discount for estimated timing of cash flows(2,840.6)(1,056.9)(252.5)(4,150.0)
Standardized measure of discounted future net cash flows$5,488.0 $1,328.0 $37.4 $6,853.4 
1 Includes amounts attributable to the noncontrolling interest in MP GOM.
Schedule of Principal Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows
The following are the principal sources of change in the standardized measure of discounted future net cash flows for the years shown.
(Millions of dollars)
202520242023
Net changes in prices and production costs 2
$(1,126.6)$(1,116.5)$(5,845.6)
Net changes in development costs46.4 (152.7)(78.8)
Sales and transfers of oil and natural gas produced, net of production costs(1,685.7)(1,824.8)(2,264.8)
Net change due to extensions and discoveries122.0 583.7 770.4 
Net change due to purchases and sales of proved reserves62.6 — (96.1)
Development costs incurred 
686.2 668.6 703.7 
Accretion of discount598.3 773.5 1,393.3 
Revisions of previous quantity estimates403.9 (688.1)(771.5)
Net change in income taxes121.2 298.8 1,229.6 
Net (decrease) increase
(771.7)(1,457.5)(4,959.8)
Standardized measure at January 15,395.9 6,853.4 11,813.2 
Standardized measure at December 31$4,624.2 $5,395.9 $6,853.4 
1  Includes amounts attributable to the noncontrolling interest in MP GOM.
2 The average prices used for crude oil (WTI) were $65.34/BBL in 2025, $75.48/BBL in 2024 and $78.22/BBL in 2023. The average prices used for natural gas (Henry Hub) were $3.39/MCF in 2025, $2.13/MCF in 2024 and $2.64/MCF in 2023.
Schedule of Capitalized Costs Relating to Oil and Gas Producing Activities
(Millions of dollars)
United
States		CanadaOtherTotal
December 31, 2025
Unproved oil and natural gas properties 1
$207.0 $6.4 $16.3 $229.7 
Proved oil and natural gas properties17,417.6 4,865.4 439.1 22,722.1 
Gross capitalized costs17,624.6 4,871.8 455.4 22,951.8 
Accumulated depreciation, depletion and amortization
Unproved oil and natural gas properties(118.5)— (11.5)(130.0)
Proved oil and natural gas properties(11,275.7)(3,412.0)(47.0)(14,734.7)
Net capitalized costs$6,230.4 $1,459.8 $396.9 $8,087.1 
December 31, 2024
Unproved oil and natural gas properties 1
$247.3 $6.6 $29.1 $283.0 
Proved oil and natural gas properties16,598.8 4,498.1 246.7 21,343.6 
Gross capitalized costs16,846.1 4,504.7 275.8 21,626.6 
Accumulated depreciation, depletion and amortization
Unproved oil and natural gas properties(111.0)— (20.7)(131.7)
Proved oil and natural gas properties(10,326.2)(3,116.2)(44.2)(13,486.6)
Net capitalized costs$6,408.9 $1,388.5 $210.9 $8,008.3 
1 Unproved oil and natural gas properties above include costs and associated accumulated amortization of properties that do not have proved reserves; these costs include mineral interests, uncompleted exploratory wells and exploratory wells capitalized pending further evaluation.