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CONTINGENCIES, COMMITMENTS, AND GUARANTEES (Tables) | 12 Months Ended
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Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |
Schedule of regulatory assets and liabilities | At December 31, 2021 and 2020, the environmental remediation liability and the balance of under recovered environmental remediation costs were reflected in the balance sheets of Southern Company, Georgia Power, and Southern Company Gas as shown in the table below. At December 31, 2021 and 2020, Alabama Power did not have environmental remediation liabilities and Mississippi Power's balance was immaterial.
| Southern Company | Georgia Power | Southern Company Gas
| (in millions)
December 31, 2021: |  |  |
Environmental remediation liability: |  |  |
Other current liabilities | $ | 69 |  | $ | 17 |  | $ | 52 |
Accrued environmental remediation | 197 |  | — |  | 197 |
Under recovered environmental remediation costs: |  |  |
Other regulatory assets, current | $ | 71 |  | $ | 12 |  | $ | 59 |
Other regulatory assets, deferred | 231 |  | 23 |  | 208 |
December 31, 2020: |  |  |
Environmental remediation liability: |  |  |
Other current liabilities | $ | 44 |  | $ | 15 |  | $ | 29 |
Accrued environmental remediation | 216 |  | — |  | 216 |
Under recovered environmental remediation costs: |  |  |
Other regulatory assets, current | $ | 46 |  | $ | 12 |  | $ | 34 |
Other regulatory assets, deferred | 265 |  | 29 |  | 236 |
Expected future contractual obligations | Southern Company Gas' expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets at December 31, 2021 were as follows:
| Pipeline Charges, Storage Capacity, and Gas Supply
| (in millions)
2022 | $ | 634 |
2023 | 455 |
2024 | 376 |
2025 | 275 |
2026 | 164 |
Thereafter | 910 |
Total | $ | 2,814 |

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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