| Cover | 12 Months Ended |
| Dec. 31, 2022 | |
| Document Information [Line Items] | |
| Document Type | PRE 14A |
| Amendment Flag | false |
| Entity Information [Line Items] | |
| Entity Registrant Name | Southwestern Energy Company |
| Entity Central Index Key | 0000007332 |
| Pay vs Performance Disclosure Unit_pure in Millions | 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] | Pay versus Performance Table Pay vs. Performance (1) Value of Fixed $100 Investment Year Summary Compensation Table Total for CEO Compensation Actually Paid to CEO (2)(3) Average Summary Compensation Table Total for Non-CEO NEOs Average Compensation Actually Paid for Non-CEO NEOs (3)(4) Total Shareholder Return (5) Peer Group Total Shareholder Return (6) Net (7) Discretionary Cash Flow (in Millions) (8) 2022 $7,527,410 $10,616,976 $2,465,448 $3,068,786 $242 $154 $1,852 $3,030 2021 $7,077,384 $16,104,218 $2,003,741 $2,159,604 $193 $106 ($25) $1,354 2020 $8,064,627 $13,957,775 $2,667,539 $2,607,357 $123 $63 ($3,112) $618 (1) non-CEO, non-CEO, non-CEO, (2) For Southwestern Energy’s CEO the “compensation actually paid” for each year reflects the following: Year Summary Minus the Plus Year-End Plus Aggregate Plus Aggregate Minus Plus Minus Prior Year Total 2022 $ 7,527,410 $ (4,898,527 ) $ 5,842,822 $ 3,122,476 $ (937,007 ) $ 32,939 $ (7,259 ) – $ 10,616,976 2021 $ 7,077,384 $ (4,402,539 ) $ 4,541,141 $ 7,045,136 $ 1,874,169 $ 31,073 – – $ 16,104,218 2020 $ 8,064,627 $ (5,609,135 ) $ 11,428,000 $ 655,950 $ (501,409 ) $ 80,258 – – $ 13,957,775 (3) (4) For Southwestern Energy’s non-CEO Year Average non-CEO Minus the Plus Average Year-End Plus Average Plus Average Minus Plus Pension Minus Average Average non-CEO 2022 $ 2,465,448 $ (1,177,089 ) $ 1,404,098 $ 556,027 $ (159,726 ) $ 6,950 $ (13,022 ) – $ 3,068,786 2021 $ 2,003,741 $ (1,225,687 ) $ 679,600 $ 468,660 $ 240,113 $ 6,823 – – $ 2,159,604 2020 $ 2,667,539 $ (1,597,031 ) $ 1,805,938 $ (316,231 ) $ 41,454 $ 28,313 $ 34,001 – $ 2,607,357 (5) (6) (7) Represents the amount of net income reflected in the Company’s audited GAAP financial statements for each applicable fiscal year. (8) “ Non-GAAP non-GAAP Southwestern Energy’s Compensation Committee reviews a variety of Company-wide and individu al factors ives of the Comp The following section provides a description of the relationships between Southwestern Energy’s total shareholder return relative to peer comparator index, as well as “compensation actually paid” relative to Southwestern Energy’s total shareholder return, net income, and Discretionary Cash Flow over the last three completed fiscal years. | ||
| Company Selected Measure Name | Discretionary Cash Flow | ||
| Named Executive Officers, Footnote [Text Block] | non-CEO, non-CEO, non-CEO, | ||
| Peer Group Issuers, Footnote [Text Block] | Reflects the total shareholder return for the S&P Oil & Gas Exploration & Production Select Industry Index total shareholder return calculated based on an assumed $100 investment as of December 31, 2019 and the reinvestment of any issued dividends. | ||
| PEO Total Compensation Amount | $ 7,527,410 | $ 7,077,384 | $ 8,064,627 |
| PEO Actually Paid Compensation Amount | $ 10,616,976 | 16,104,218 | 13,957,775 |
| Adjustment To PEO Compensation, Footnote [Text Block] | (2) For Southwestern Energy’s CEO the “compensation actually paid” for each year reflects the following: Year Summary Minus the Plus Year-End Plus Aggregate Plus Aggregate Minus Plus Minus Prior Year Total 2022 $ 7,527,410 $ (4,898,527 ) $ 5,842,822 $ 3,122,476 $ (937,007 ) $ 32,939 $ (7,259 ) – $ 10,616,976 2021 $ 7,077,384 $ (4,402,539 ) $ 4,541,141 $ 7,045,136 $ 1,874,169 $ 31,073 – – $ 16,104,218 2020 $ 8,064,627 $ (5,609,135 ) $ 11,428,000 $ 655,950 $ (501,409 ) $ 80,258 – – $ 13,957,775 | ||
| Non-PEO NEO Average Total Compensation Amount | $ 2,465,448 | 2,003,741 | 2,667,539 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 3,068,786 | 2,159,604 | 2,607,357 |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | (4) For Southwestern Energy’s non-CEO Year Average non-CEO Minus the Plus Average Year-End Plus Average Plus Average Minus Plus Pension Minus Average Average non-CEO 2022 $ 2,465,448 $ (1,177,089 ) $ 1,404,098 $ 556,027 $ (159,726 ) $ 6,950 $ (13,022 ) – $ 3,068,786 2021 $ 2,003,741 $ (1,225,687 ) $ 679,600 $ 468,660 $ 240,113 $ 6,823 – – $ 2,159,604 2020 $ 2,667,539 $ (1,597,031 ) $ 1,805,938 $ (316,231 ) $ 41,454 $ 28,313 $ 34,001 – $ 2,607,357 | ||
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | CAP and Cumulative TSR The table below shows the relationship between “compensation actually paid” to our CEO and the average of the “compensation actually paid” to our other NEOs, our cumulative TSR and the cumulative TSR of our selected peer group index ov ecember | ||
| Compensation Actually Paid vs. Net Income [Text Block] | CAP and Net Income The table below shows the relationship betw een “comp actually | ||
| Compensation Actually Paid vs. Company Selected Measure [Text Block] | CAP and Discretionary Cash Flow The table below shows the relationship between “compensation actually paid” to our CEO and the average of the “compensation actually paid” to our other NEOs and discretionary cash flow over three fiscal years ending December 31, 2022. | ||
| Total Shareholder Return Vs Peer Group [Text Block] | CAP and Cumulative TSR The table below shows the relationship between “compensation actually paid” to our CEO and the average of the “compensation actually paid” to our other NEOs, our cumulative TSR and the cumulative TSR of our selected peer group index ov ecember | ||
| Tabular List [Table Text Block] | Performance Metrics to Link Executive “Compensation Actually Paid” with C ompany Provided below are the most important measures used to link “compensation actually paid” with Southwestern Energy performance during the most recently completed fiscal year: Discretionary Cash Flow Operating Expense Proved Developed F&D Cost Return on Capital Employed Reinvestment Rate Relative Total Shareholder Return HSE combined metrics of Total Recordable Injury Rate, Total Produced Fluids Spill Rate, and Methane Emissions Intensity | ||
| Total Shareholder Return Amount | $ 242 | 193 | 123 |
| Peer Group Total Shareholder Return Amount | 154 | 106 | 63 |
| Net Income (Loss) | $ 1,852,000,000 | $ (25,000,000) | $ (3,112,000,000) |
| Company Selected Measure Amount | 3,030 | 1,354 | 618 |
| PEO Name | William J. Way | ||
| Measure [Axis]: 1 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Discretionary Cash Flow | ||
| Non-GAAP Measure Description [Text Block] | (8) “ Non-GAAP non-GAAP Southwestern Energy’s Compensation Committee reviews a variety of Company-wide and individu al factors ives of the Comp The following section provides a description of the relationships between Southwestern Energy’s total shareholder return relative to peer comparator index, as well as “compensation actually paid” relative to Southwestern Energy’s total shareholder return, net income, and Discretionary Cash Flow over the last three completed fiscal years. | ||
| Measure [Axis]: 2 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Operating Expense | ||
| Measure [Axis]: 3 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Proved Developed F&D Cost | ||
| Measure [Axis]: 4 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Return on Capital Employed | ||
| Measure [Axis]: 5 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Reinvestment Rate | ||
| Measure [Axis]: 6 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Relative Total Shareholder Return | ||
| Measure [Axis]: 7 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | HSE combined metrics of Total Recordable InjuryRate, Total Produced Fluids Spill Rate, and MethaneEmissions Intensity | ||
| PEO [Member] | YearEnd Fair Value of Awards Granted in Covered Year Outstanding and Unvested at FYE [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 5,842,822 | $ 4,541,141 | $ 11,428,000 |
| PEO [Member] | Change in Fair Value of Outstanding and Unvested Awards Granted in Prior Years at FYE [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 3,122,476 | 7,045,136 | 655,950 |
| PEO [Member] | Change in Equity Fair Value up to Any Applicable Vesting Event for Equity Awards Vesting During the Fiscal Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (937,007) | 1,874,169 | (501,409) |
| PEO [Member] | Change in Defined Benefit Pension Value [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 32,939 | 31,073 | 80,258 |
| PEO [Member] | Plus Pension Service Costs [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (7,259) | ||
| PEO [Member] | Value of Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (4,898,527) | (4,402,539) | (5,609,135) |
| Non-PEO NEO [Member] | YearEnd Fair Value of Awards Granted in Covered Year Outstanding and Unvested at FYE [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 1,404,098 | 679,600 | 1,805,938 |
| Non-PEO NEO [Member] | Change in Fair Value of Outstanding and Unvested Awards Granted in Prior Years at FYE [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 556,027 | 468,660 | (316,231) |
| Non-PEO NEO [Member] | Change in Equity Fair Value up to Any Applicable Vesting Event for Equity Awards Vesting During the Fiscal Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (159,726) | 240,113 | 41,454 |
| Non-PEO NEO [Member] | Change in Defined Benefit Pension Value [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 6,950 | 6,823 | 28,313 |
| Non-PEO NEO [Member] | Plus Pension Service Costs [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (13,022) | 34,001 | |
| Non-PEO NEO [Member] | Value of Awards [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ (1,177,089) | $ (1,225,687) | $ (1,597,031) |
