| Cover | 12 Months Ended |
| Dec. 31, 2022 | |
| Document Information [Line Items] | |
| Document Type | DEF 14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | CONSOL ENERGY INC. |
| Entity Central Index Key | 0001710366 |
| Pay vs Performance Disclosure Unit_pure in Thousands | 12 Months Ended | ||
| Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | |
| Pay vs Performance Disclosure [Table] | |||
| Pay vs Performance [Table Text Block] | 2022 Pay versus Performance Table Year Summary Compensation Table total for CEO (1) ($) Average Summary Compensation Table total for other (2) ($) Compensation actually paid to CEO (3) ($) Average compensation actually paid to other NEOs (3) ($) TSR (4) ($) Peer group TSR (4) ($) Net ($ in thousands) ICP Free Cash Flow* ($ in thousands) 2022 9,963,103 1,477,694 33,755,260 3,694,785 462.15 454.34 466,979 585,224 2021 7,115,513 1,029,306 20,081,272 2,158,019 156.56 204.93 34,110 184,001 2020 6,740,223 1,547,535 4,862,793 1,293,669 49.70 65.60 (13,214) 108,937 (1) The CEO for each of 2022, 2021, and 2020 was James A. Brock. (2) The other named executive officers for each applicable year are as follows: • 2022: Mitesh B. Thakkar, Martha A. Wiegand, Kurt R. Salvatori, and John M. Rothka • 2021: Mitesh B. Thakkar, Martha A. Wiegand, Kurt R. Salvatori, and John M. Rothka • 2020: Martha A. Wiegand, Kurt R. Salvatori, and James McCaffrey (3) SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid” as reported in the Pay versus Performance Table. “Compensation actually paid” does not necessarily represent cash and/or equity value transferred to the applicable named executive officer without restriction, but rather is a valuation calculated under applicable SEC rules. In general, “compensation actually paid” is calculated as summary compensation table total compensation adjusted to (a) include the value of any pension benefit (or loss) attributed to the past fiscal year, including on account of any amendments adopted during such year; and (b) include the fair market value of equity awards as of December 31, 2022 or, if earlier, the vesting date (rather than the grant date) and factor in dividends and interest accrued with respect to such awards. For purposes of the pension valuation adjustments shown below, there was no prior service cost to report. In addition, for purposes of the equity award adjustments shown below, no equity awards were cancelled due to failure to meet vesting conditions, no equity awards were granted and vested in the same year, and there are no dividends or interest accrued to report. The following table details these adjustments: Year Executive(s) Summary compensation table total ($) Pension Valuation Adjustments Equity Award Adjustments Deduct ($) Include ($) Deduct ($) Include year-end ($) Include change ($) Include change in ($) 2022 CEO 9,963,103 0 0 (2,000,000) 4,670,771 15,927,406 5,193,980 Other NEOs 1,477,694 (4,171) 13,558 (258,884) 604,560 1,267,074 594,955 2021 CEO 7,115,513 (26,152) 0 (1,750,000) 7,645,348 6,752,916 343,646 Other NEOs 1,029,306 (19,622) 12,726 (200,000) 873,751 427,475 34,383 2020 CEO 6,740,223 (674,326) 47,818 (3,483,000) 2,680,799 (350,716) (98,005) Other NEOs 1,547,535 (122,692) 16,289 (533,333) 437,603 (40,393) (11,340) (4) TSR is determined based on the value of an initial fixed investment of $100. The peer group TSR represents TSR of the peer group disclosed in our Annual Report on Form 10-K | ||
| Company Selected Measure Name | ICP Free Cash Flow | ||
| Named Executive Officers, Footnote [Text Block] | (2) The other named executive officers for each applicable year are as follows: • 2022: Mitesh B. Thakkar, Martha A. Wiegand, Kurt R. Salvatori, and John M. Rothka • 2021: Mitesh B. Thakkar, Martha A. Wiegand, Kurt R. Salvatori, and John M. Rothka • 2020: Martha A. Wiegand, Kurt R. Salvatori, and James McCaffrey | ||
| Peer Group Issuers, Footnote [Text Block] | TSR is determined based on the value of an initial fixed investment of $100. The peer group TSR represents TSR of the peer group disclosed in our Annual Report on Form 10-K | ||
| PEO Total Compensation Amount | $ 9,963,103 | $ 7,115,513 | $ 6,740,223 |
| PEO Actually Paid Compensation Amount | $ 33,755,260 | 20,081,272 | 4,862,793 |
| Adjustment To PEO Compensation, Footnote [Text Block] | (3) SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid” as reported in the Pay versus Performance Table. “Compensation actually paid” does not necessarily represent cash and/or equity value transferred to the applicable named executive officer without restriction, but rather is a valuation calculated under applicable SEC rules. In general, “compensation actually paid” is calculated as summary compensation table total compensation adjusted to (a) include the value of any pension benefit (or loss) attributed to the past fiscal year, including on account of any amendments adopted during such year; and (b) include the fair market value of equity awards as of December 31, 2022 or, if earlier, the vesting date (rather than the grant date) and factor in dividends and interest accrued with respect to such awards. For purposes of the pension valuation adjustments shown below, there was no prior service cost to report. In addition, for purposes of the equity award adjustments shown below, no equity awards were cancelled due to failure to meet vesting conditions, no equity awards were granted and vested in the same year, and there are no dividends or interest accrued to report. The following table details these adjustments: Year Executive(s) Summary compensation table total ($) Pension Valuation Adjustments Equity Award Adjustments Deduct ($) Include ($) Deduct ($) Include year-end ($) Include change ($) Include change in ($) 2022 CEO 9,963,103 0 0 (2,000,000) 4,670,771 15,927,406 5,193,980 Other NEOs 1,477,694 (4,171) 13,558 (258,884) 604,560 1,267,074 594,955 2021 CEO 7,115,513 (26,152) 0 (1,750,000) 7,645,348 6,752,916 343,646 Other NEOs 1,029,306 (19,622) 12,726 (200,000) 873,751 427,475 34,383 2020 CEO 6,740,223 (674,326) 47,818 (3,483,000) 2,680,799 (350,716) (98,005) Other NEOs 1,547,535 (122,692) 16,289 (533,333) 437,603 (40,393) (11,340) | ||
| Non-PEO NEO Average Total Compensation Amount | $ 1,477,694 | 1,029,306 | 1,547,535 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 3,694,785 | 2,158,019 | 1,293,669 |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | (3) SEC rules require certain adjustments be made to the Summary Compensation Table totals to determine “compensation actually paid” as reported in the Pay versus Performance Table. “Compensation actually paid” does not necessarily represent cash and/or equity value transferred to the applicable named executive officer without restriction, but rather is a valuation calculated under applicable SEC rules. In general, “compensation actually paid” is calculated as summary compensation table total compensation adjusted to (a) include the value of any pension benefit (or loss) attributed to the past fiscal year, including on account of any amendments adopted during such year; and (b) include the fair market value of equity awards as of December 31, 2022 or, if earlier, the vesting date (rather than the grant date) and factor in dividends and interest accrued with respect to such awards. For purposes of the pension valuation adjustments shown below, there was no prior service cost to report. In addition, for purposes of the equity award adjustments shown below, no equity awards were cancelled due to failure to meet vesting conditions, no equity awards were granted and vested in the same year, and there are no dividends or interest accrued to report. The following table details these adjustments: Year Executive(s) Summary compensation table total ($) Pension Valuation Adjustments Equity Award Adjustments Deduct ($) Include ($) Deduct ($) Include year-end ($) Include change ($) Include change in ($) 2022 CEO 9,963,103 0 0 (2,000,000) 4,670,771 15,927,406 5,193,980 Other NEOs 1,477,694 (4,171) 13,558 (258,884) 604,560 1,267,074 594,955 2021 CEO 7,115,513 (26,152) 0 (1,750,000) 7,645,348 6,752,916 343,646 Other NEOs 1,029,306 (19,622) 12,726 (200,000) 873,751 427,475 34,383 2020 CEO 6,740,223 (674,326) 47,818 (3,483,000) 2,680,799 (350,716) (98,005) Other NEOs 1,547,535 (122,692) 16,289 (533,333) 437,603 (40,393) (11,340) | ||
| Tabular List [Table Text Block] | 2022 Unranked Performance Measures As noted above, our Compensation Committee believes in a wholistic evaluation of our executives’ and our company’s performance and uses a mix of performance measures throughout our annual and long-term incentive programs to align executive pay with shareholder value creation. As required by SEC rules, the performance measures identified as the most important for named executive officers’ 2022 compensation decisions are listed below. Net Income Free Cash Flow* TSR Net Debt Level* ICP Free Cash Flow* Average Cash Cost of Coal Sold per Ton* Adjusted EBITDA* | ||
| Total Shareholder Return Amount | $ 462.15 | 156.56 | 49.7 |
| Peer Group Total Shareholder Return Amount | 454.34 | 204.93 | 65.6 |
| Net Income (Loss) | $ 466,979,000 | $ 34,110,000 | $ (13,214,000) |
| Company Selected Measure Amount | 585,224 | 184,001 | 108,937 |
| PEO Name | James A. Brock | ||
| Measure [Axis]: 1 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Net Income | ||
| Measure [Axis]: 2 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Free Cash Flow | ||
| Measure [Axis]: 3 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | TSR | ||
| Measure [Axis]: 4 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Net Debt Level | ||
| Measure [Axis]: 5 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | ICP Free Cash Flow | ||
| Measure [Axis]: 6 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Average Cash Cost of Coal Sold per Ton | ||
| Measure [Axis]: 7 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Adjusted EBITDA | ||
| PEO [Member] | Deduct Change in Pension Value [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 0 | $ (26,152) | $ (674,326) |
| PEO [Member] | Include Pension Service Cost Adjustment [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 0 | 0 | 47,818 |
| PEO [Member] | Deduct Stock Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (2,000,000) | (1,750,000) | (3,483,000) |
| PEO [Member] | Include Year End Value Of Outstanding Unvested Equity Awards Granted [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 4,670,771 | 7,645,348 | 2,680,799 |
| PEO [Member] | Include Change In Value Of Unvested Equity Awards Granted In Prior Years [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 15,927,406 | 6,752,916 | (350,716) |
| PEO [Member] | Include Change In Value Of Equity Awards Granted In Prior Years Which Vested [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 5,193,980 | 343,646 | (98,005) |
| Non-PEO NEO [Member] | Deduct Change in Pension Value [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (4,171) | (19,622) | (122,692) |
| Non-PEO NEO [Member] | Include Pension Service Cost Adjustment [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 13,558 | 12,726 | 16,289 |
| Non-PEO NEO [Member] | Deduct Stock Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (258,884) | (200,000) | (533,333) |
| Non-PEO NEO [Member] | Include Year End Value Of Outstanding Unvested Equity Awards Granted [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 604,560 | 873,751 | 437,603 |
| Non-PEO NEO [Member] | Include Change In Value Of Unvested Equity Awards Granted In Prior Years [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 1,267,074 | 427,475 | (40,393) |
| Non-PEO NEO [Member] | Include Change In Value Of Equity Awards Granted In Prior Years Which Vested [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 594,955 | $ 34,383 | $ (11,340) |
