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Business Segments
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Business Segments
Note T – Business Segments
Murphy’s reportable segments are organized into geographic areas of operations.  The Company’s exploration and production activity is subdivided into segments for the United States, Canada and all other countries.  Each of these segments derives revenues primarily from the sale of crude oil, condensate, natural gas liquids and/or natural gas.  The Company’s management evaluates segment performance based on income (loss) from operations, excluding interest income and interest expense. 
The Company has several customers that purchase a significant portion of its oil and natural gas production.  During the years 2021, 2020 and 2019, sales to Chevron represented approximately 30%, 24%, and 25% of the Company’s total sales revenue. During the years 2020 and 2019, sales to Phillips 66 represented approximately 18%, and 17% of the Company’s total sales revenue. Due to the quantity of active oil and natural gas purchasers in the markets where it produces hydrocarbons, the Company does not foresee any difficulty with selling its hydrocarbon production at fair market prices.
Assets held for sale as of December 31, 2021 include the net property, plant and equipment of the CA-2 project in Brunei and the Company’s office building in El Dorado, Arkansas (see Note 2). The U.K. and Malaysian operations have been reported as Discontinued operations for all periods presented in these consolidated financial statements. The Company completed the sale of its Malaysian assets in 2019.  
Information about business segments and geographic operations is reported in the following tables.  For geographic purposes, revenues are attributed to the country in which the sale occurs.  Corporate and other activities, including interest income, other gains and losses (including foreign exchange gains/losses, and realized/unrealized gains/losses on crude oil contracts), interest expense and unallocated overhead, are shown in the tables to reconcile the business segments to consolidated totals.  As used in the table on the following page, certain long-lived assets at December 31, exclude investments, noncurrent receivables, deferred tax assets, and other intangible assets.
Exploration and Production
(Millions of dollars)
United
States 1
CanadaOtherTotal
E&P		Corporate
and
Other		Discontinued
Operations		Consolidated
Total
Year ended December 31, 2021
Segment income (loss) - including NCI 1
$766.3 (16.1)(33.5)716.7 $(668.0)(1.2)47.5 
Revenues from external customers2,337.5 476.3 4.9 2,818.7 (519.4)— 2,299.3 
Interest and other income (loss)(11.6)(1.9)3.2 (10.3)(6.5)— (16.8)
Interest expense, net of capitalization— — (0.2)(0.2)(221.6)— (221.8)
Income tax expense (benefit)183.9 (1.7)(9.5)172.7 (178.6)— (5.9)
Significant noncash charges (credits)
Impairment of assets— 171.3 18.0 189.3 7.0 — 196.3 
Depreciation, depletion and amortization616.5 163.8 1.8 782.1 13.0 — 795.1 
Accretion of asset retirement obligations36.9 9.7 — 46.6 — — 46.6 
Amortization of undeveloped leases11.1 0.2 7.6 18.9 — — 18.9 
Deferred and noncurrent income taxes176.3 (1.9)(8.0)166.4 (170.5)— (4.1)
Additions to property, plant, equipment519.5 52.7 13.1 585.3 — — 585.3 
Total assets at year-end6,591.6 2,231.9 259.8 9,083.3 1,220.8 0.8 10,304.9 
Year ended December 31, 2020
Segment income (loss) - including NCI 1
$(1,014.3)(35.0)(85.6)(1,134.9)$(120.3)(7.2)(1,262.4)
Revenues from external customers1,411.8 345.8 1.8 1,759.4 207.9 — 1,967.3 
Interest and other income (loss)(9.9)0.8 0.8 (8.2)(9.1)— (17.3)
Interest expense, net of capitalization— (0.5)(0.4)(0.9)(168.5)— (169.4)
Income tax expense (benefit)(244.2)(21.4)2.1 (263.5)(30.2)— (293.7)
Significant noncash charges (credits)
Impairment of assets1,152.5 — 39.7 1,192.2 14.1 — 1,206.3 
Depreciation, depletion and amortization749.4 213.2 2.3 964.9 22.3 — 987.2 
Accretion of asset retirement obligations36.6 5.5 — 42.1 — — 42.1 
Amortization of undeveloped leases17.2 0.4 9.1 26.7 — — 26.7 
Deferred and noncurrent income taxes(244.2)(10.6)1.9 (252.9)(25.1)— (278.0)
Additions to property, plant, equipment623.1 118.3 15.2 756.6 — — 756.6 
Total assets at year-end6,915.5 2,404.1 267.7 9,587.3 1,032.9 0.7 10,620.9 
Exploration and Production
(Millions of dollars)
United
States 1
CanadaOtherTotal
E&P		Corporate
and
Other		Discontinued
Operations		Consolidated
Total
Year ended December 31, 2019
Segment income (loss) - including NCI 1
$518.4 (4.3)(53.5)460.6 $(271.8)1,064.5 1,253.3 
Revenues from external customers2,367.0 447.0 11.6 2,825.6 3.5 — 2,829.1 
Interest and other income (loss)(13.4)(1.5)(0.9)(15.8)(6.7)— (22.5)
Interest expense, net of capitalization— (0.1)(0.4)(0.5)(218.8)— (219.3)
Income tax expense (benefit)115.6 (2.9)(12.4)100.3 (85.6)— 14.7 
Significant noncash charges (credits)
Depreciation, depletion and amortization878.7 243.0 3.5 1,125.2 22.6 — 1,147.8 
Accretion of asset retirement obligations34.4 6.1 — 40.5 — — 40.5 
Amortization of undeveloped leases23.1 1.3 3.6 28.0 — — 28.0 
Deferred and noncurrent income taxes111.8 14.0 (13.4)112.4 (83.9)— 28.5 
Additions to property, plant, equipment2,193.3 284.1 69.8 2,547.2 13.6 — 2,560.8 
Total assets at year-end8,043.3 2,303.7 308.6 10,655.6 1,046.2 16.7 11,718.5 
1 Includes results attributable to a noncontrolling interest in MP GOM.
Geographic InformationCertain Long-Lived Assets at December 31
(Millions of dollars)
United
States		CanadaOtherTotal
2021$6,371.4 1,566.9 189.6 8,127.9 
20206,395.7 1,702.5 170.8 8,269.0 
20198,003.9 1,761.2 204.6 9,969.7