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Supplemental Oil and Gas Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Reserve Quantities [Line Items] |
Summary of Proved Reserves Based on Average Prices |
﻿ | Equivalents
(Millions of barrels of oil equivalent) | Total |  | United States |  | Canada |  | Malaysia and Other
Proved developed and undeveloped reserves: |  |  |  |  |  |  |
December 31, 2016 | 684.5 |  |  | 287.4 |  |  | 241.0 |  |  | 156.2 |
Revisions of previous estimates | (5.6 | ) |  | (5.4 | ) |  | 4.9 |  |  | (5.2 | )
Improved recovery | 2.0 |  |  | — |  |  | — |  |  | 2.0 |
Extensions and discoveries | 71.2 |  |  | 39.6 |  |  | 31.3 |  |  | 0.3 |
Purchases of properties | 5.9 |  |  | 5.9 |  |  | — |  |  | — |
Production | (59.8 | ) |  | (22.5 | ) |  | (18.1 | ) |  | (19.2 | )
December 31, 2017 | 698.2 |  |  | 304.9 |  |  | 259.2 |  |  | 134.1 |
Revisions of previous estimates | (21.8 | ) |  | (14.0 | ) |  | (18.1 | ) |  | 10.4 |
Improved recovery | 0.9 |  |  | — |  |  | — |  |  | 0.9 |
Extensions and discoveries | 122.6 |  |  | 60.1 |  |  | 61.8 |  |  | 0.8 |
Purchases of properties | 106.9 |  |  | 98.7 |  |  | 6.9 |  |  | 1.3 |
Production | (62.8 | ) |  | (24.0 | ) |  | (21.1 | ) |  | (17.7 | )
December 31, 2018 | 844.0 |  |  | 425.6 |  |  | 288.6 |  |  | 129.7 |
Revisions of previous estimates | 28.4 |  |  | (17.9 | ) |  | 46.1 |  |  | 0.3 |
Extensions and discoveries | 73.3 |  |  | 62.2 |  |  | 11.1 |  |  | — |
Purchases of properties | 76.2 |  |  | 76.2 |  |  | — |  |  | — |
Sales of properties | (121.5 | ) |  | (0.1 | ) |  | — |  |  | (121.4 | )
Production | (75.4 | ) |  | (45.9 | ) |  | (21.7 | ) |  | (7.8 | )
December 31, 2019 ¹ | 825.0 |  |  | 500.1 |  |  | 324.1 |  |  | 0.8 |
Proved developed reserves: |  |  |  |  |  |  |
December 31, 2016 | 343.5 |  |  | 157.8 |  |  | 103.3 |  |  | 82.4 |
December 31, 2017 | 346.7 |  |  | 170.9 |  |  | 114.1 |  |  | 61.7 |
December 31, 2018 | 430.2 |  |  | 247.0 |  |  | 124.2 |  |  | 59.1 |
December 31, 2019 ² | 472.3 |  |  | 273.4 |  |  | 198.1 |  |  | 0.8 |
Proved undeveloped reserves: |  |  |  |  |  |  |
December 31, 2016 | 341.1 |  |  | 129.6 |  |  | 137.7 |  |  | 73.8 |
December 31, 2017 | 351.5 |  |  | 134.0 |  |  | 145.1 |  |  | 72.4 |
December 31, 2018 | 413.8 |  |  | 178.7 |  |  | 164.5 |  |  | 70.7 |
December 31, 2019 ³ | 352.7 |  |  | 226.7 |  |  | 126.0 |  |  | — |
1 Includes proved reserves of 24.6 MMBOE, consisting of 22.1 MMBBL oil, 0.9 MMBBL NGLs, and 9.5 BCF natural gas attributable to the noncontrolling interest in MP GOM. 2 Includes proved developed reserves of 19.6 MMBOE, consisting of 17.7 MMBBL oil, 0.7 MMBBL NGLs, and 7.1 BCF natural gas attributable to the noncontrolling interest in MP GOM. 3 Includes proved undeveloped reserves of 5.0 MMBOE, consisting of 4.4 MMBBL oil, 0.2 MMBBL NGLs, and 2.4 BCF natural gas attributable to the noncontrolling interest in MP GOM.
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities |
(Millions of dollars) | United States |  | Canada |  | Malaysia |  | Other |  | Total
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |
Property acquisition costs |  |  |  |  |  |  |  |  |
Unproved | $ | 533.8 |  |  | 0.2 |  |  | — |  |  | 13.0 |  |  | 547.0 |
Proved | 733.1 |  |  | — |  |  | — |  |  | — |  |  | 733.1 |
Total acquisition costs | 1,266.9 |  |  | 0.2 |  |  | — |  |  | 13.0 |  |  | 1,280.1 |
Exploration costs 1 | 44.8 |  |  | 6.4 |  |  | — |  |  | 67.4 |  |  | 118.6 |
Development costs 1 | 979.0 |  |  | 281.8 |  |  | — |  |  | 21.6 |  |  | 1,282.4 |
Total costs incurred | 2,290.7 |  |  | 288.4 |  |  | — |  |  | 102.0 |  |  | 2,681.1 |
Charged to expense |  |  |  |  |  |  |  |  |
Geophysical and other costs | 21.6 |  |  | 0.5 |  |  | — |  |  | 32.2 |  |  | 54.3 |
Total charged to expense | 21.6 |  |  | 0.5 |  |  | — |  |  | 32.2 |  |  | 54.3 |
Property additions | $ | 2,269.1 |  |  | 287.9 |  |  | — |  |  | 69.8 |  |  | 2,626.8 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |
Property acquisition costs |  |  |  |  |  |  |  |  |
Unproved | $ | 2.8 |  |  | — |  |  | — |  |  | 0.2 |  |  | 3.0 |
Proved | 794.3 |  |  | — |  |  | — |  |  | — |  |  | 794.3 |
Total acquisition costs | 797.1 |  |  | — |  |  | — |  |  | 0.2 |  |  | 797.3 |
Exploration costs 1 | 88.1 |  |  | 0.6 |  |  | 2.2 |  |  | 35.1 |  |  | 126.0 |
Development costs 1 | 853.7 |  |  | 373.8 |  |  | 145.9 |  |  | 16.6 |  |  | 1,390.0 |
Total costs incurred | 1,738.9 |  |  | 374.4 |  |  | 148.1 |  |  | 51.9 |  |  | 2,313.3 |
Charged to expense |  |  |  |  |  |  |  |  |
Dry hole expense | 16.0 |  |  | — |  |  | 0.1 |  |  | 4.5 |  |  | 20.6 |
Geophysical and other costs | 13.4 |  |  | 0.6 |  |  | 2.1 |  |  | 31.3 |  |  | 47.4 |
Total charged to expense | 29.4 |  |  | 0.6 |  |  | 2.2 |  |  | 35.8 |  |  | 68.0 |
Property additions | $ | 1,709.5 |  |  | 373.8 |  |  | 145.9 |  |  | 16.1 |  |  | 2,245.3 |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |
Property acquisition costs |  |  |  |  |  |  |  |  |
Unproved | $ | 50.4 |  |  | — |  |  | — |  |  | 13.0 |  |  | 63.4 |
Proved | 7.7 |  |  | — |  |  | — |  |  | — |  |  | 7.7 |
Total acquisition costs | 58.1 |  |  | — |  |  | — |  |  | 13.0 |  |  | 71.1 |
Exploration costs 1 | 13.7 |  |  | 0.6 |  |  | (8.9 | ) |  | 73.8 |  |  | 79.2 |
Development costs 1 | 508.4 |  |  | 273.8 |  |  | 35.7 |  |  | 1.1 |  |  | 819.0 |
Total costs incurred | 580.2 |  |  | 274.4 |  |  | 26.8 |  |  | 87.9 |  |  | 969.3 |
Charged to expense |  |  |  |  |  |  |  |  |
Dry hole expense | (1.9 | ) |  | — |  |  | 0.7 |  |  | (3.0 | ) |  | (4.2 | )
Geophysical and other costs | 9.7 |  |  | 0.5 |  |  | 1.7 |  |  | 53.3 |  |  | 65.2 |
Total charged to expense | 7.8 |  |  | 0.5 |  |  | 2.4 |  |  | 50.3 |  |  | 61.0 |
Property additions | $ | 572.4 |  |  | 273.9 |  |  | 24.4 |  |  | 37.6 |  |  | 908.3 |
1 Includes noncash asset retirement costs as follows:
2019 |  |  |  |  |  |  |  |  |
Exploration costs | $ | — |  |  | — |  |  | — |  |  | — |  |  | — |
Development costs | 75.8 |  |  | 3.8 |  |  | — |  |  | — |  |  | 79.6 |
﻿ | $ | 75.8 |  |  | 3.8 |  |  | — |  |  | — |  |  | 79.6 |
2018 |  |  |  |  |  |  |  |  |
Exploration costs | $ | — |  |  | — |  |  | — |  |  | — |  |  | — |
Development costs | 366.0 |  |  | — |  |  | 7.3 |  |  | 0.2 |  |  | 373.5 |
﻿ | $ | 366.0 |  |  | — |  |  | 7.3 |  |  | 0.2 |  |  | 373.5 |
2017 |  |  |  |  |  |  |  |  |
Exploration costs | $ | — |  |  | — |  |  | — |  |  | — |  |  | — |
Development costs | 37.6 |  |  | 6.3 |  |  | 8.4 |  |  | — |  |  | 52.3 |
﻿ | $ | 37.6 |  |  | 6.3 |  |  | 8.4 |  |  | — |  |  | 52.3 |
Results of Operations for Oil andGas Producing Activities |
(Millions of dollars) | United States |  | Canada |  | Other |  | Total
Year ended December 31, 2019 |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Crude oil and natural gas liquids sales | $ | 2,285.8 |  |  | 287.4 |  |  | 11.6 |  |  | 2,584.8 |
Natural gas sales | 73.9 |  |  | 158.4 |  |  | — |  |  | 232.3 |
Total oil and natural gas revenues | 2,359.7 |  |  | 445.8 |  |  | 11.6 |  |  | 2,817.1 |
Other operating revenues | 7.3 |  |  | 1.2 |  |  | — |  |  | 8.5 |
Total revenues | 2,367.0 |  |  | 447.0 |  |  | 11.6 |  |  | 2,825.6 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | 461.5 |  |  | 142.4 |  |  | 1.3 |  |  | 605.2 |
Severance and ad valorem taxes | 46.6 |  |  | 1.4 |  |  | — |  |  | 48.0 |
Transportation, gathering and processing | 140.8 |  |  | 35.5 |  |  | — |  |  | 176.3 |
Exploration costs charged to expense | 21.4 |  |  | 0.6 |  |  | 45.3 |  |  | 67.3 |
Undeveloped lease amortization | 23.1 |  |  | 1.3 |  |  | 3.6 |  |  | 28.0 |
Depreciation, depletion and amortization | 878.7 |  |  | 243.0 |  |  | 3.5 |  |  | 1,125.2 |
Accretion of asset retirement obligations | 34.4 |  |  | 6.1 |  |  | — |  |  | 40.5 |
Selling and general expenses | 74.3 |  |  | 30.0 |  |  | 22.5 |  |  | 126.8 |
Other expenses (benefits) | 52.2 |  |  | (6.1 | ) |  | 1.3 |  |  | 47.4 |
Total costs and expenses | 1,733.0 |  |  | 454.2 |  |  | 77.5 |  |  | 2,264.7 |
Results of operations before taxes | 634.0 |  |  | (7.2 | ) |  | (65.9 | ) |  | 560.9 |
Income tax expense (benefit) | 115.6 |  |  | (2.9 | ) |  | (12.4 | ) |  | 100.3 |
Results of operations | $ | 518.4 |  |  | (4.3 | ) |  | (53.5 | ) |  | 460.6 |
Year ended December 31, 2018 |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Crude oil and natural gas liquids sales | $ | 1,277.7 |  |  | 302.8 |  |  | 6.1 |  |  | 1,586.6 |
Natural gas sales | 53.6 |  |  | 166.3 |  |  | — |  |  | 219.9 |
Total oil and natural gas revenues | 1,331.3 |  |  | 469.1 |  |  | 6.1 |  |  | 1,806.5 |
Other operating revenues | 1.4 |  |  | 1.4 |  |  | 16.1 |  |  | 18.9 |
Total revenues | 1,332.7 |  |  | 470.5 |  |  | 22.2 |  |  | 1,825.4 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | 230.5 |  |  | 122.6 |  |  | 0.7 |  |  | 353.8 |
Severance and ad valorem taxes | 50.9 |  |  | 1.2 |  |  | — |  |  | 52.1 |
Transportation, gathering and processing | 43.1 |  |  | 31.9 |  |  | — |  |  | 75.0 |
Exploration costs charged to expense | 29.4 |  |  | 0.6 |  |  | 31.6 |  |  | 61.6 |
Undeveloped lease amortization | 36.8 |  |  | 0.8 |  |  | 2.5 |  |  | 40.1 |
Depreciation, depletion and amortization | 519.5 |  |  | 232.4 |  |  | 3.5 |  |  | 755.4 |
Accretion of asset retirement obligations | 19.5 |  |  | 7.7 |  |  | — |  |  | 27.2 |
Impairment of assets | 20.0 |  |  | — |  |  | — |  |  | 20.0 |
Selling and general expenses | 49.0 |  |  | 26.8 |  |  | 23.5 |  |  | 99.3 |
Other expenses | 23.0 |  |  | (19.1 | ) |  | 2.3 |  |  | 6.2 |
Total costs and expenses | 1,021.7 |  |  | 404.9 |  |  | 64.1 |  |  | 1,490.7 |
Results of operations before taxes | 311.0 |  |  | 65.6 |  |  | (41.9 | ) |  | 334.7 |
Income tax expense (benefit) | 68.1 |  |  | 14.5 |  |  | (25.3 | ) |  | 57.3 |
Results of operations | $ | 242.9 |  |  | 51.1 |  |  | (16.6 | ) |  | 277.4 |
1 Results exclude corporate overhead, interest and discontinued operations. 2019 and 2018 include noncontrolling interest in MP GOM. ໿
(Millions of dollars) | United States |  | Canada |  | Other |  | Total
Year ended December 31, 2017 |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |
Crude oil and natural gas liquids sales | $ | 903.7 |  |  | 203.7 |  |  | — |  |  | 1,107.4 |
Natural gas sales | 37.9 |  |  | 155.1 |  |  | — |  |  | 193.0 |
Total oil and natural gas revenues | 941.6 |  |  | 358.8 |  |  | — |  |  | 1,300.4 |
Other operating revenues | 2.7 |  |  | 126.7 |  |  | — |  |  | 129.4 |
Total revenues | 944.3 |  |  | 485.5 |  |  | — |  |  | 1,429.8 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | 198.5 |  |  | 101.1 |  |  | — |  |  | 299.6 |
Severance and ad valorem taxes | 42.2 |  |  | 1.5 |  |  | — |  |  | 43.7 |
Exploration costs charged to expense | 7.8 |  |  | 0.5 |  |  | 50.3 |  |  | 58.6 |
Undeveloped lease amortization | 60.2 |  |  | 1.6 |  |  | — |  |  | 61.8 |
Depreciation, depletion and amortization | 546.1 |  |  | 185.4 |  |  | 3.8 |  |  | 735.3 |
Accretion of asset retirement obligations | 17.4 |  |  | 7.9 |  |  | — |  |  | 25.3 |
Selling and general expenses | 61.8 |  |  | 28.3 |  |  | 19.6 |  |  | 109.7 |
Other expenses | 20.0 |  |  | 2.3 |  |  | 73.7 |  |  | 96.0 |
Total costs and expenses | 954.0 |  |  | 328.6 |  |  | 73.7 |  |  | 1,356.3 |
Results of operations before taxes | (9.7 | ) |  | 156.9 |  |  | (73.7 | ) |  | 73.5 |
Income tax expense (benefit) | (0.8 | ) |  | 44.4 |  |  | (36.2 | ) |  | 7.4 |
Results of operations | $ | (8.9 | ) |  | 112.5 |  |  | (37.5 | ) |  | 66.1 |
1 Results exclude corporate overhead, interest and discontinued operations.
Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves |
(Millions of dollars) | United States |  | Canada |  | Malaysia & Other |  | Total
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Future cash inflows | $ | 23,565.6 |  |  | 4,912.1 |  |  | 55.7 |  |  | 28,533.4 |
Future development costs | (4,137.8 | ) |  | (723.7 | ) |  | (0.3 | ) |  | (4,861.8 | )
Future production costs | (8,986.2 | ) |  | (2,549.9 | ) |  | (29.9 | ) |  | (11,566.0 | )
Future income taxes | (1,709.3 | ) |  | (414.5 | ) |  | (14.1 | ) |  | (2,137.9 | )
Future net cash flows | 8,732.3 |  |  | 1,224.0 |  |  | 11.4 |  |  | 9,967.7 |
10% annual discount for estimated timing of cash flows | (3,633.1 | ) |  | (504.0 | ) |  | (3.0 | ) |  | (4,140.1 | )
Standardized measure of discounted future net cash flows | $ | 5,099.2 |  |  | 720.0 |  |  | 8.4 |  |  | 5,827.6 |
December 31, 2018 |  |  |  |  |  |  |
Future cash inflows | $ | 23,473.9 |  |  | 5,437.5 |  |  | 5,511.6 |  |  | 34,423.0 |
Future development costs | (3,279.1 | ) |  | (1,362.7 | ) |  | (517.4 | ) |  | (5,159.2 | )
Future production costs | (7,279.5 | ) |  | (2,693.0 | ) |  | (2,813.4 | ) |  | (12,785.9 | )
Future income taxes | (2,216.5 | ) |  | (236.4 | ) |  | (472.0 | ) |  | (2,924.9 | )
Future net cash flows | 10,698.8 |  |  | 1,145.4 |  |  | 1,708.8 |  |  | 13,553.0 |
10% annual discount for estimated timing of cash flows | (4,295.4 | ) |  | (531.4 | ) |  | (446.3 | ) |  | (5,273.1 | )
Standardized measure of discounted future net cash flows | $ | 6,403.4 |  |  | 614.0 |  |  | 1,262.5 |  |  | 8,279.9 |
December 31, 2017 |  |  |  |  |  |  |
Future cash inflows | $ | 12,885.8 |  |  | 4,714.3 |  |  | 4,392.0 |  |  | 21,992.1 |
Future development costs | (2,079.5 | ) |  | (1,081.7 | ) |  | (632.3 | ) |  | (3,793.5 | )
Future production costs | (4,765.3 | ) |  | (2,507.4 | ) |  | (2,305.0 | ) |  | (9,577.7 | )
Future income taxes | (893.7 | ) |  | (161.1 | ) |  | (232.2 | ) |  | (1,287.0 | )
Future net cash flows | 5,147.3 |  |  | 964.1 |  |  | 1,222.5 |  |  | 7,333.9 |
10% annual discount for estimated timing of cash flows | (2,698.2 | ) |  | (394.6 | ) |  | (318.2 | ) |  | (3,411.0 | )
Standardized measure of discounted future net cash flows | $ | 2,449.1 |  |  | 569.5 |  |  | 904.3 |  |  | 3,922.9 |
1 2019 and 2018 include noncontrolling interest in MP GOM.
Principal Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows |
(Millions of dollars) | 2019 |  | 2018 |  | 2017
Net changes in prices and production costs 2 | (2,993.9 | ) |  | 2,972.6 |  |  | 2,428.4 |
Net changes in development costs | (675.7 | ) |  | (1,891.1 | ) |  | (724.4 | )
Sales and transfers of oil and natural gas produced, net of production costs | (2,163.8 | ) |  | (1,978.6 | ) |  | (1,576.0 | )
Net change due to extensions and discoveries | 1,221.9 |  |  | 1,930.3 |  |  | 807.9 |
Net change due to purchases and sales of proved reserves | (628.1 | ) |  | 3,152.4 |  |  | 85.9 |
Development costs incurred | 1,282.4 |  |  | 1,017.3 |  |  | 802.7 |
Accretion of discount | 1,002.0 |  |  | 469.5 |  |  | 270.9 |
Revisions of previous quantity estimates | (71.2 | ) |  | (347.8 | ) |  | (109.5 | )
Net change in income taxes | 574.1 |  |  | (967.6 | ) |  | (643.0 | )
Net increase (decrease) | (2,452.3 | ) |  | 4,357.0 |  |  | 1,342.9 |
Standardized measure at January 1 | 8,279.9 |  |  | 3,922.9 |  |  | 2,580.0 |
Standardized measure at December 31 | 5,827.6 |  |  | 8,279.9 |  |  | 3,922.9 |
Capitalized Costs Relating to Oil and Gas Producing Activities |
(Millions of dollars) | United States |  | Canada |  | Other |  | Total
December 31, 2019 |  |  |  |  |  |  |
Unproved oil and natural gas properties | $ | 1,116.6 |  |  | 243.7 |  |  | 210.4 |  |  | 1,570.7 |
Proved oil and natural gas properties | 13,292.6 |  |  | 4,176.7 |  |  | 21.1 |  |  | 17,490.4 |
Gross capitalized costs | 14,409.2 |  |  | 4,420.4 |  |  | 231.5 |  |  | 19,061.1 |
Accumulated depreciation, depletion and amortization |  |  |  |  |  |  |
Unproved oil and natural gas properties | (136.4 | ) |  | (225.4 | ) |  | (25.9 | ) |  | (387.7 | )
Proved oil and natural gas properties | (6,298.9 | ) |  | (2,438.6 | ) |  | (2.4 | ) |  | (8,739.9 | )
Net capitalized costs | $ | 7,973.9 |  |  | 1,756.4 |  |  | 203.2 |  |  | 9,933.5 |
December 31, 2018 |  |  |  |  |  |  |
Unproved oil and natural gas properties | $ | 394.2 |  |  | 250.0 |  |  | 176.9 |  |  | 821.1 |
Proved oil and natural gas properties | 11,678.3 |  |  | 3,693.0 |  |  | — |  |  | 15,371.3 |
Gross capitalized costs | 12,072.5 |  |  | 3,943.0 |  |  | 176.9 |  |  | 16,192.4 |
Accumulated depreciation, depletion and amortization |  |  |  |  |  |  |
Unproved oil and natural gas properties | (129.3 | ) |  | (213.5 | ) |  | (25.4 | ) |  | (368.2 | )
Proved oil and natural gas properties | (5,433.7 | ) |  | (2,088.8 | ) |  | — |  |  | (7,522.5 | )
Net capitalized costs | $ | 6,509.5 |  |  | 1,640.7 |  |  | 151.5 |  |  | 8,301.7 |
Net natural gas liquids revenue |
Reserve Quantities [Line Items] |
Summary of Proved Reserves Based on Average Prices |
(Millions of barrels) | Total |  | United States |  | Canada |  | Malaysia and Other
Proved developed and undeveloped NGL reserves: |  |  |  |  |  |  |
December 31, 2016 | 42.5 |  |  | 36.4 |  |  | 5.6 |  |  | 0.5 |
Revisions of previous estimates | 1.3 |  |  | 2.0 |  |  | (0.6 | ) |  | (0.1 | )
Extensions and discoveries | 7.8 |  |  | 7.0 |  |  | 0.8 |  |  | — |
Purchase of properties | 0.5 |  |  | 0.5 |  |  | — |  |  | — |
Production | (3.2 | ) |  | (2.9 | ) |  | (0.2 | ) |  | (0.1 | )
December 31, 2017 | 48.9 |  |  | 43.0 |  |  | 5.6 |  |  | 0.3 |
Revisions of previous estimates | (6.2 | ) |  | (5.3 | ) |  | (1.6 | ) |  | 0.7 |
Extensions and discoveries | 12.0 |  |  | 9.7 |  |  | 2.3 |  |  | — |
Purchases of properties | 3.0 |  |  | 3.0 |  |  | — |  |  | — |
Production | (3.5 | ) |  | (2.8 | ) |  | (0.4 | ) |  | (0.3 | )
December 31, 2018 | 54.2 |  |  | 47.6 |  |  | 5.9 |  |  | 0.7 |
Revisions of previous estimates | (5.0 | ) |  | (2.5 | ) |  | (2.5 | ) |  | — |
Extensions and discoveries | 6.8 |  |  | 6.4 |  |  | 0.4 |  |  | — |
Purchases of properties | 5.2 |  |  | 5.2 |  |  | — |  |  | — |
Sales of properties | (0.6 | ) |  | — |  |  | — |  |  | (0.6 | )
Production | (4.5 | ) |  | (3.9 | ) |  | (0.5 | ) |  | (0.1 | )
December 31, 2019 ¹ | 56.1 |  |  | 52.8 |  |  | 3.3 |  |  | — |
Proved developed NGL reserves: |  |  |  |  |  |  |
December 31, 2016 | 22.2 |  |  | 20.8 |  |  | 0.9 |  |  | 0.5 |
December 31, 2017 | 24.6 |  |  | 23.3 |  |  | 1.0 |  |  | 0.3 |
December 31, 2018 | 27.3 |  |  | 24.9 |  |  | 1.7 |  |  | 0.7 |
December 31, 2019 ² | 28.1 |  |  | 26.2 |  |  | 1.9 |  |  | — |
Proved undeveloped NGL reserves: |  |  |  |  |  |  |
December 31, 2016 | 20.3 |  |  | 15.6 |  |  | 4.7 |  |  | — |
December 31, 2017 | 24.3 |  |  | 19.7 |  |  | 4.6 |  |  | — |
December 31, 2018 | 26.9 |  |  | 22.7 |  |  | 4.2 |  |  | — |
December 31, 2019 ³ | 28.0 |  |  | 26.6 |  |  | 1.4 |  |  | — |
1 Includes total proved reserves of 0.9 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM. 2 Includes proved developed reserves of 0.7 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM. 3 Includes proved undeveloped reserves of 0.2 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM.
Net crude oil and condensate revenue |
Reserve Quantities [Line Items] |
Summary of Proved Reserves Based on Average Prices |
(Millions of barrels) | Total |  | United States |  | Canada |  | Malaysia and Other
Proved developed and undeveloped crude oil reserves: |  |  |  |  |  |  |
December 31, 2016 | 329.0 |  |  | 214.4 |  |  | 48.9 |  |  | 65.7 |
Revisions of previous estimates | (6.0 | ) |  | (4.7 | ) |  | 2.3 |  |  | (3.6 | )
Improved recovery | 2.0 |  |  | — |  |  | — |  |  | 2.0 |
Extensions and discoveries | 31.6 |  |  | 27.2 |  |  | 4.4 |  |  | — |
Purchases of properties | 4.7 |  |  | 4.7 |  |  | — |  |  | — |
Production | (33.2 | ) |  | (16.9 | ) |  | (4.1 | ) |  | (12.2 | )
December 31, 2017 | 328.1 |  |  | 224.7 |  |  | 51.5 |  |  | 51.9 |
Revisions of previous estimates | (15.3 | ) |  | (15.0 | ) |  | (8.0 | ) |  | 7.7 |
Improved recovery | 0.8 |  |  | — |  |  | — |  |  | 0.8 |
Extensions and discoveries | 58.9 |  |  | 42.9 |  |  | 16.0 |  |  | — |
Purchases of properties | 93.6 |  |  | 92.3 |  |  | — |  |  | 1.3 |
Production | (33.6 | ) |  | (18.4 | ) |  | (4.5 | ) |  | (10.7 | )
December 31, 2018 | 432.5 |  |  | 326.5 |  |  | 55.0 |  |  | 51.0 |
Revisions of previous estimates | (31.0 | ) |  | (17.1 | ) |  | (14.0 | ) |  | 0.1 |
Extensions and discoveries | 58.2 |  |  | 49.2 |  |  | 9.0 |  |  | — |
Purchases of properties | 56.3 |  |  | 56.3 |  |  | — |  |  | — |
Sales of properties | (45.8 | ) |  | (0.1 | ) |  | — |  |  | (45.7 | )
Production | (46.3 | ) |  | (37.0 | ) |  | (4.7 | ) |  | (4.6 | )
December 31, 2019 ¹ | 423.9 |  |  | 377.8 |  |  | 45.3 |  |  | 0.8 |
Proved developed crude oil reserves: |  |  |  |  |  |  |
December 31, 2016 | 184.9 |  |  | 113.9 |  |  | 19.2 |  |  | 51.8 |
December 31, 2017 | 185.5 |  |  | 126.3 |  |  | 21.9 |  |  | 37.3 |
December 31, 2018 | 249.3 |  |  | 189.0 |  |  | 23.3 |  |  | 37.0 |
December 31, 2019 ² | 230.9 |  |  | 205.0 |  |  | 25.1 |  |  | 0.8 |
Proved undeveloped crude oil reserves: |  |  |  |  |  |  |
December 31, 2016 | 144.1 |  |  | 100.5 |  |  | 29.7 |  |  | 13.9 |
December 31, 2017 | 142.6 |  |  | 98.4 |  |  | 29.6 |  |  | 14.6 |
December 31, 2018 | 183.2 |  |  | 137.5 |  |  | 31.7 |  |  | 14.0 |
December 31, 2019 ³ | 193.0 |  |  | 172.8 |  |  | 20.2 |  |  | — |
1 Includes total proved reserves of 22.1 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM. 2 Includes proved developed reserves of 17.7 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM. 3 Includes proved undeveloped reserves of 4.4 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM.
Net natural gas revenue |
Reserve Quantities [Line Items] |
Summary of Proved Reserves Based on Average Prices |
(Billions of cubic feet) | Total |  | United States |  | Canada |  | Malaysia and Other
Proved developed and undeveloped natural gas reserves: |  |  |  |  |  |  |
December 31, 2016 | 1,878.0 |  |  | 219.4 |  |  | 1,118.9 |  |  | 539.7 |
Revisions of previous estimates | (5.4 | ) |  | (16.0 | ) |  | 19.4 |  |  | (8.8 | )
Extensions and discoveries | 190.6 |  |  | 32.2 |  |  | 156.7 |  |  | 1.7 |
Purchases of properties | 4.0 |  |  | 4.0 |  |  | — |  |  | — |
Production | (140.1 | ) |  | (16.3 | ) |  | (82.6 | ) |  | (41.2 | )
December 31, 2017 | 1,927.1 |  |  | 223.3 |  |  | 1,212.4 |  |  | 491.4 |
Revisions of previous estimates | (1.8 | ) |  | 37.6 |  |  | (51.2 | ) |  | 11.8 |
Improved recovery | 0.6 |  |  | — |  |  | — |  |  | 0.6 |
Extensions and discoveries | 310.3 |  |  | 44.7 |  |  | 261.0 |  |  | 4.6 |
Purchases of properties | 61.7 |  |  | 20.3 |  |  | 41.4 |  |  | — |
Production | (154.3 | ) |  | (16.9 | ) |  | (97.2 | ) |  | (40.2 | )
December 31, 2018 | 2,143.6 |  |  | 309.0 |  |  | 1,366.4 |  |  | 468.2 |
Revisions of previous estimates | 386.5 |  |  | 10.3 |  |  | 375.3 |  |  | 0.9 |
Extensions and discoveries | 49.8 |  |  | 39.5 |  |  | 10.3 |  |  | — |
Purchases of properties | 88.3 |  |  | 88.3 |  |  | — |  |  | — |
Sales of properties | (450.7 | ) |  | (0.1 | ) |  | — |  |  | (450.6 | )
Production | (147.8 | ) |  | (30.2 | ) |  | (99.1 | ) |  | (18.5 | )
December 31, 2019 ¹ | 2,069.7 |  |  | 416.8 |  |  | 1,652.9 |  |  | — |
Proved developed natural gas reserves: |  |  |  |  |  |  |
December 31, 2016 | 818.1 |  |  | 138.7 |  |  | 498.9 |  |  | 180.5 |
December 31, 2017 | 819.3 |  |  | 127.7 |  |  | 547.0 |  |  | 144.6 |
December 31, 2018 | 921.6 |  |  | 198.3 |  |  | 595.0 |  |  | 128.3 |
December 31, 2019 ² | 1,279.8 |  |  | 253.1 |  |  | 1,026.7 |  |  | — |
Proved undeveloped natural gas reserves: |  |  |  |  |  |  |
December 31, 2016 | 1,059.9 |  |  | 80.7 |  |  | 620.0 |  |  | 359.2 |
December 31, 2017 | 1,107.8 |  |  | 95.6 |  |  | 665.5 |  |  | 346.7 |
December 31, 2018 | 1,222.0 |  |  | 110.7 |  |  | 771.4 |  |  | 339.9 |
December 31, 2019 ³ | 789.9 |  |  | 163.7 |  |  | 626.2 |  |  | — |
1 Includes total proved reserves of 9.5 BCF for Total and United States attributable to the noncontrolling interest in MP GOM. 2 Includes proved developed reserves of 7.1 BCF for Total and United States attributable to the noncontrolling interest in MP GOM. 3 Includes proved undeveloped reserves of 2.4 BCF for Total and United States attributable to the noncontrolling interest in MP GOM.

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