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Supplemental Oil and Gas Information (Unaudited) - Summary of Proved Reserves Based on Average Prices (Details) MMBbls in Millions, ft³ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 MMBbls ft³ | Dec. 31, 2019 MMBbls ft³ | Dec. 31, 2018 ft³ MMBbls | Dec. 31, 2017 MMBbls ft³
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed reserves | 410.8 | 472.3 | 430.2 | 346.7
Proved undeveloped reserves | 304.1 | 352.7 | 413.8 | 351.5
Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 825.0 | 844.0 | 698.2 |
Revisions of previous estimates | (194.7) | 28.4 | (21.8) |
Improved recovery |  |  | 0.9 |
Extensions and discoveries | 150.3 | 73.3 | 122.6 |
Purchases of properties |  | 76.2 | 106.9 |
Sales of properties | (1.7) | (121.5) |  |
Production | (63.9) | (75.4) | (62.8) |
Proved developed and undeveloped reserves, ending balance | 714.9 | 825.0 | 844.0 |
Net crude oil and condensate revenue | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 423.9 | 432.5 | 328.1 |
Revisions of previous estimates | (137.4) | (31.0) | (15.3) |
Improved recovery |  |  | 0.8 |
Extensions and discoveries | 19.6 | 58.2 | 58.9 |
Purchases of properties |  | 56.3 | 93.6 |
Sales of properties | (1.5) |  |  |
Production | (38.1) | (46.3) | (33.6) |
Proved developed and undeveloped reserves, ending balance | 266.5 | 423.9 | 432.5 |
Proved developed reserves | 179.8 | 230.9 | 249.3 | 185.5
Proved undeveloped reserves | 86.7 | 193.0 | 183.2 | 142.6
Net natural gas liquids revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 56.1 | 54.2 | 48.9 |
Revisions of previous estimates | (16.4) | (5.0) | (6.2) |
Extensions and discoveries | 2.8 | 6.8 | 12.0 |
Purchases of properties |  | 5.2 | 3.0 |
Sales of properties | (0.1) |  |  |
Production | (4.2) | (4.5) | (3.5) |
Proved developed and undeveloped reserves, ending balance | 38.2 | 56.1 | 54.2 |
Proved developed reserves | 28.7 | 28.1 | 27.3 | 24.6
Proved undeveloped reserves | 9.5 | 28.0 | 26.9 | 24.3
Net natural gas revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³ | 2,069.7 | 2,143.6 | 1,927.1 |
Revisions of previous estimates | ft³ | (245.4) | 386.5 | (1.8) |
Extensions and discoveries | ft³ | 767.2 | 49.8 | 310.3 |
Purchases of properties | ft³ |  | 88.3 | 61.7 |
Sales of properties | ft³ | (0.7) |  |  |
Production | ft³ | (129.8) | (147.8) | (154.3) |
Proved developed and undeveloped reserves, ending balance | ft³ | 2,461.0 | 2,069.7 | 2,143.6 |
Proved developed reserves | ft³ | 1,213.8 | 1,279.8 | 921.6 | 819.3
Proved undeveloped reserves | ft³ | 1,247.2 | 789.9 | 1,222.0 | 1,107.8
MP Gulf of Mexico LLC |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped reserves, ending balance | 17.4 |  |  |
Proved developed reserves | 14.2 |  |  |
Proved undeveloped reserves | 3.2 |  |  |
MP Gulf of Mexico LLC | Net crude oil and condensate revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped reserves, ending balance | 15.6 |  |  |
Proved developed reserves | 12.7 |  |  |
Proved undeveloped reserves | 2.9 |  |  |
MP Gulf of Mexico LLC | Net natural gas liquids revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped reserves, ending balance | 0.7 |  |  |
Proved developed reserves | 0.6 |  |  |
Proved undeveloped reserves | 0.1 |  |  |
MP Gulf of Mexico LLC | Net natural gas revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped reserves, ending balance | ft³ | 6.5 |  |  |
Proved developed reserves | ft³ | 5.7 |  |  |
Proved undeveloped reserves | ft³ | 0.8 |  |  |
Noncontrolling interest volume | ft³ | 1.6 |  |  |
U.S. |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed reserves | 230.3 | 273.4 | 247.0 | 170.9
Proved undeveloped reserves | 98.2 | 226.7 | 178.7 | 134.0
U.S. | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 500.1 | 425.6 | 304.9 |
Revisions of previous estimates | (146.6) | (17.9) | (14.0) |
Improved recovery |  |  | 0.0 |
Extensions and discoveries | 19.5 | 62.2 | 60.1 |
Purchases of properties |  | 76.2 | 98.7 |
Sales of properties | (1.7) | (0.1) |  |
Production | (42.8) | (45.9) | (24.0) |
Proved developed and undeveloped reserves, ending balance | 328.5 | 500.1 | 425.6 |
U.S. | Net crude oil and condensate revenue | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 377.8 | 326.5 | 224.7 |
Revisions of previous estimates | (116.8) | (17.1) | (15.0) |
Improved recovery |  |  | 0.0 |
Extensions and discoveries | 14.5 | 49.2 | 42.9 |
Purchases of properties |  | 56.3 | 92.3 |
Sales of properties | (1.5) |  |  |
Production | (33.4) | (37.0) | (18.4) |
Proved developed and undeveloped reserves, ending balance | 240.6 | 377.8 | 326.5 |
Proved developed reserves | 161.4 | 205.0 | 189.0 | 126.3
Proved undeveloped reserves | 79.2 | 172.8 | 137.5 | 98.4
U.S. | Net natural gas liquids revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 52.8 | 47.6 | 43.0 |
Revisions of previous estimates | (17.1) | (2.5) | (5.3) |
Extensions and discoveries | 2.7 | 6.4 | 9.7 |
Purchases of properties |  | 5.2 | 3.0 |
Sales of properties | (0.1) |  |  |
Production | (3.7) | (3.9) | (2.8) |
Proved developed and undeveloped reserves, ending balance | 34.6 | 52.8 | 47.6 |
Proved developed reserves | 25.5 | 26.2 | 24.9 | 23.3
Proved undeveloped reserves | 9.1 | 26.6 | 22.7 | 19.7
U.S. | Net natural gas revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³ | 416.8 | 309.0 | 223.3 |
Revisions of previous estimates | ft³ | (76.2) | 10.3 | 37.6 |
Extensions and discoveries | ft³ | 14.0 | 39.5 | 44.7 |
Purchases of properties | ft³ |  | 88.3 | 20.3 |
Sales of properties | ft³ | (0.7) |  |  |
Production | ft³ | (34.4) | (30.2) | (16.9) |
Proved developed and undeveloped reserves, ending balance | ft³ | 319.5 | 416.8 | 309.0 |
Proved developed reserves | ft³ | 260.2 | 253.1 | 198.3 | 127.7
Proved undeveloped reserves | ft³ | 59.3 | 163.7 | 110.7 | 95.6
Noncontrolling interest volume | ft³ | 72.0 |  |  |
Canada |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed reserves | 180.5 | 198.1 | 124.2 | 114.1
Proved undeveloped reserves | 205.9 | 126.0 | 164.5 | 145.1
Canada | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 324.1 | 288.6 | 259.2 |
Revisions of previous estimates | (47.3) | 46.1 | (18.1) |
Improved recovery |  |  | 0.0 |
Extensions and discoveries | 130.7 | 11.1 | 61.8 |
Purchases of properties |  | 0.0 | 6.9 |
Sales of properties | 0.0 | 0.0 |  |
Production | (21.1) | (21.7) | (21.1) |
Proved developed and undeveloped reserves, ending balance | 386.4 | 324.1 | 288.6 |
Canada | Net crude oil and condensate revenue | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 45.3 | 55.0 | 51.5 |
Revisions of previous estimates | (19.8) | (14.0) | (8.0) |
Improved recovery |  |  | 0.0 |
Extensions and discoveries | 5.1 | 9.0 | 16.0 |
Purchases of properties |  | 0.0 | 0.0 |
Sales of properties | 0.0 |  |  |
Production | (4.7) | (4.7) | (4.5) |
Proved developed and undeveloped reserves, ending balance | 25.9 | 45.3 | 55.0 |
Proved developed reserves | 18.4 | 25.1 | 23.3 | 21.9
Proved undeveloped reserves | 7.5 | 20.2 | 31.7 | 29.6
Canada | Net natural gas liquids revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 3.3 | 5.9 | 5.6 |
Revisions of previous estimates | 0.7 | (2.5) | (1.6) |
Extensions and discoveries | 0.1 | 0.4 | 2.3 |
Purchases of properties |  | 0.0 | 0.0 |
Sales of properties | 0.0 |  |  |
Production | (0.5) | (0.5) | (0.4) |
Proved developed and undeveloped reserves, ending balance | 3.6 | 3.3 | 5.9 |
Proved developed reserves | 3.2 | 1.9 | 1.7 | 1.0
Proved undeveloped reserves | 0.4 | 1.4 | 4.2 | 4.6
Canada | Net natural gas revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³ | 1,652.9 | 1,366.4 | 1,212.4 |
Revisions of previous estimates | ft³ | (169.2) | 375.3 | (51.2) |
Extensions and discoveries | ft³ | 753.2 | 10.3 | 261.0 |
Purchases of properties | ft³ |  | 0.0 | 41.4 |
Sales of properties | ft³ | 0.0 |  |  |
Production | ft³ | (95.4) | (99.1) | (97.2) |
Proved developed and undeveloped reserves, ending balance | ft³ | 2,141.5 | 1,652.9 | 1,366.4 |
Proved developed reserves | ft³ | 953.6 | 1,026.7 | 595.0 | 547.0
Proved undeveloped reserves | ft³ | 1,187.9 | 626.2 | 771.4 | 665.5
Noncontrolling interest volume | ft³ | 108.8 |  |  |
Malaysia and Other |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed reserves | 0.0 | 0.8 | 59.1 | 61.7
Proved undeveloped reserves | 0.0 | 0.0 | 70.7 | 72.4
Malaysia and Other | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 0.8 | 129.7 | 134.1 |
Revisions of previous estimates | (0.8) | 0.3 | 10.4 |
Improved recovery |  |  | 0.9 |
Extensions and discoveries | 0.0 | 0.0 | 0.8 |
Purchases of properties |  | 0.0 | 1.3 |
Sales of properties | 0.0 | (121.4) |  |
Production | 0.0 | (7.8) | (17.7) |
Proved developed and undeveloped reserves, ending balance | 0.0 | 0.8 | 129.7 |
Malaysia and Other | Net crude oil and condensate revenue | Crude Oil |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 0.8 | 51.0 | 51.9 |
Revisions of previous estimates | (0.8) | 0.1 | 7.7 |
Improved recovery |  |  | 0.8 |
Extensions and discoveries | 0.0 | 0.0 | 0.0 |
Purchases of properties |  | 0.0 | 1.3 |
Sales of properties | 0.0 |  |  |
Production | 0.0 | (4.6) | (10.7) |
Proved developed and undeveloped reserves, ending balance | 0.0 | 0.8 | 51.0 |
Proved developed reserves | 0.0 | 0.8 | 37.0 | 37.3
Proved undeveloped reserves | 0.0 | 0.0 | 14.0 | 14.6
Malaysia and Other | Net natural gas liquids revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | 0.0 | 0.7 | 0.3 |
Revisions of previous estimates | 0.0 | 0.0 | 0.7 |
Extensions and discoveries | 0.0 | 0.0 | 0.0 |
Purchases of properties |  | 0.0 | 0.0 |
Sales of properties | 0.0 |  |  |
Production | 0.0 | (0.1) | (0.3) |
Proved developed and undeveloped reserves, ending balance | 0.0 | 0.0 | 0.7 |
Proved developed reserves | 0.0 | 0.0 | 0.7 | 0.3
Proved undeveloped reserves | 0.0 | 0.0 | 0.0 | 0.0
Malaysia and Other | Net natural gas revenue |  |  |  |
Proved developed and undeveloped oil reserves: |  |  |  |
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³ | 0.0 | 468.2 | 491.4 |
Revisions of previous estimates | ft³ | 0.0 | 0.9 | 11.8 |
Extensions and discoveries | ft³ | 0.0 | 0.0 | 4.6 |
Purchases of properties | ft³ |  | 0.0 | 0.0 |
Sales of properties | ft³ | 0.0 |  |  |
Production | ft³ | 0.0 | (18.5) | (40.2) |
Proved developed and undeveloped reserves, ending balance | ft³ | 0.0 | 0.0 | 468.2 |
Proved developed reserves | ft³ | 0.0 | 0.0 | 128.3 | 144.6
Proved undeveloped reserves | ft³ | 0.0 | 0.0 | 339.9 | 346.7

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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + Details
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