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Supplemental Gas Data (unaudited) - Proved Undeveloped Reserves (Details) Mcfe in Thousands, Mcf in Thousands, $ in Thousands, bbl in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) Mcfe well Mcf bbl | Dec. 31, 2020 USD ($) Mcfe well bbl Mcf | Dec. 31, 2019 USD ($) Mcfe bbl Mcf
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 9,549,758 | 8,425,667 | 7,881,335
Revisions (energy) | (327,050) | 740,129 | (518,570)
Price changes (energy) | 86,532 | (1,351,934) | (45,246)
Extensions and Discoveries (energy) | 906,738 | 2,246,968 | 1,647,297
Production (MMcfe) | (590,248) | (511,072) | (539,149)
Ending balance (energy) | 9,625,730 | 9,549,758 | 8,425,667
Proved developed resources (energy) | 5,905,611 | 5,199,748 | 4,838,858
Proved undeveloped resources (energy) | 3,720,119 | 4,350,010 | 3,586,809
Downward revision due to plan changes (energy) | 356,000 | 677,000 | 872,000
Downward revision due to PUD removal (energy) |  |  | 304,000
Upward revision from increased performance (energy) | 331,000 | 579,000 | 657,000
Proved and unproved resources, extensions and discoveries (energy) | 26,000 | 70,000 | 77,000
Increase in reserve due to decrease in operating costs (energy) |  | 853,000 |
Downward revision for acreage consolidation (energy) | 267,000 |  |
Downward revision due to 5 year rule (energy) | 60,000 |  |
Performance revision associated with proved developed producing assets (energy) | 46,000 |  |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 465,861 | $ 487,291 | $ 1,192,599
Downward revision due to risk in well development (energy) | 20,000 |  |
Reserves reported for more than five years | 310 |  |
Utica |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Number of wells removed from development plan | well |  | 4 |
Utica | Central Pennsylvania and Southwest Pennsylvania |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved and unproved resources, extensions and discoveries (energy) | 405,000 |  |
Number of dry gas wells added | well | 16 |  |
Marcellus |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Number of wells removed from development plan | well |  | 23 |
Marcellus | Southwest Pennsylvania and West Virginia |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved and unproved resources, extensions and discoveries (energy) | 476,000 |  |
Number of dry gas wells added | well | 29 |  |
Natural Gas |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | Mcf | 9,034,066 | 7,938,406 | 7,436,338
Revisions (volume) | Mcf | (409,215) | 407,836 | (521,617)
Price Changes (volume) | Mcf | 82,248 | (1,019,523) | (40,773)
Extension and Discoveries (volume) | Mcf | 832,696 | 2,188,773 | 1,569,813
Production (volume) | Mcf | (551,988) | (481,426) | (505,355)
Ending balance (volume) | Mcf | 8,987,807 | 9,034,066 | 7,938,406
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | Mcf | 5,569,332 | 4,939,283 | 4,473,534
Proved undeveloped resources (volume) | Mcf | 3,418,475 | 4,094,783 | 3,464,873
NGLs |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 81,867 | 75,844 | 65,904
Revisions (volume) | bbl | 13,655 | 51,857 | 5,926
Price Changes (volume) | bbl | 692 | (50,456) | (740)
Extension and Discoveries (volume) | bbl | 12,047 | 9,299 | 10,182
Production (volume) | bbl | (5,976) | (4,677) | (5,428)
Ending balance (volume) | bbl | 102,285 | 81,867 | 75,844
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 53,204 | 42,204 | 59,800
Proved undeveloped resources (volume) | bbl | 49,081 | 39,664 | 16,044
Condensate & Crude Oil |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 4,081 | 5,366 | 8,261
Revisions (volume) | bbl | 39 | 3,525 | (5,418)
Price Changes (volume) | bbl | 22 | (4,946) | (5)
Extension and Discoveries (volume) | bbl | 294 | 400 | 2,732
Production (volume) | bbl | (400) | (264) | (204)
Ending balance (volume) | bbl | 4,036 | 4,081 | 5,366
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 2,843 | 1,207 | 1,087
Proved undeveloped resources (volume) | bbl | 1,193 | 2,874 | 4,278
Proved Undeveloped |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 4,350,010 |  |
Undeveloped Reserves Transferred to Developed (energy) | (1,133,110) |  |
Extensions and Discoveries (energy) | 880,965 |  |
Ending balance (energy) | 3,720,119 | 4,350,010 |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 248,232 |  |
Proved Undeveloped | Revisions Due to Five Year Rule |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (59,948) |  |
Proved Undeveloped | Price Revisions |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (4,939) |  |
Proved Undeveloped | Revisions Due to Plan Changes |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (643,994) |  |
Proved Undeveloped | Revisions Due to Changes Related to Well Performance |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | 331,135 |  |

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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + 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 4 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61797-109447 + Details
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