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DERIVATIVES (Tables) | 12 Months Ended
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Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of energy-related derivatives | At December 31, 2021, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows:
| Net Purchased mmBtu |  | Longest Hedge Date |  | Longest Non-Hedge Date
| (in millions) |  |  |  |
Southern Company(*) | 311 |  | 2030 |  | 2025
Alabama Power | 74 |  | 2024 |  | —
Georgia Power | 89 |  | 2024 |  | —
Mississippi Power | 75 |  | 2025 |  | —
Southern Power | 5 |  | 2030 |  | 2022
Southern Company Gas(*) | 68 |  | 2024 |  | 2025
(*)Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of long natural gas positions of 74 million mmBtu and short natural gas positions of 6 million mmBtu at December 31, 2021, which is also included in Southern Company's total volume. See Note 15 under "Southern Company Gas" for information regarding the sale of Sequent.
Notional amount of interest rate derivatives | At December 31, 2021, the following interest rate derivatives were outstanding:
| Notional Amount |  | Interest Rate Received |  | Weighted Average Interest Rate Paid |  | Hedge Maturity Date |  | Fair Value Gain (Loss) December 31, 2021
| (in millions) |  |  |  |  |  |  |  | (in millions)
Fair Value Hedges of Existing Debt |  |  |  |  |  |  |  |
Southern Company parent | $ | 400 |  |  | 1.75% |  | 1-month LIBOR + 0.68% |  | March 2028 |  | $ | (5) |
Southern Company parent | 1,000 |  |  | 3.70% |  | 1-month LIBOR + 2.36% |  | April 2030 |  | (6) |
Southern Company Gas | 500 |  |  | 1.75% |  | 1-month LIBOR + 0.38% |  | January 2031 |  | 1 |
Southern Company | $ | 1,900 |  |  |  |  |  |  |  |  | $ | (10) |
Schedule of foreign exchange contracts | At December 31, 2021, the following foreign currency derivatives were outstanding:
| Pay Notional | Pay Rate | Receive Notional | Receive Rate | Hedge Maturity Date | Fair Value Gain (Loss) December 31, 2021
| (in millions) |  | (in millions) |  |  | (in millions)
Fair Value Hedges of Existing Debt |  |  |  |  |
Southern Company parent | $ | 1,476 |  | 3.39% | € | 1,250 |  | 1.88% | September 2027 | $ | (63) |
Cash Flow Hedges of Existing Debt |  |  |  |  |
Southern Power | $ | 677 |  | 2.95% | € | 600 |  | 1.00% | June 2022 | $ | (5) |
Southern Power | 564 |  | 3.78% | 500 |  | 1.85% | June 2026 | (10) |
Southern Power total | $ | 1,241 |  |  | € | 1,100 |  |  |  | $ | (15) |
Southern Company | $ | 2,717 |  |  | € | 2,350 |  |  |  | $ | (78) |
Fair value of energy-related derivatives and interest rate derivatives | At December 31, 2021 and 2020, the fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected in the balance sheets as follows:
| 2021 | 2020
Derivative Category and Balance Sheet Location | Assets | Liabilities | Assets | Liabilities
| (in millions)
Southern Company |  |  |  |
Derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Energy-related derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | $ | 129 |  | $ | 30 |  | $ | 24 |  | $ | 11 |
Other deferred charges and assets/Other deferred credits and liabilities | 72 |  | 6 |  | 18 |  | 19 |
Total derivatives designated as hedging instruments for regulatory purposes | $ | 201 |  | $ | 36 |  | $ | 42 |  | $ | 30 |
Derivatives designated as hedging instruments in cash flow and fair value hedges |  |  |  |
Energy-related derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | $ | 7 |  | $ | 5 |  | $ | 3 |  | $ | 5 |
Other deferred charges and assets/Other deferred credits and liabilities | 1 |  | — |  | — |  | — |
Interest rate derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | 19 |  | — |  | 20 |  | — |
Other deferred charges and assets/Other deferred credits and liabilities | — |  | 29 |  | — |  | — |
Foreign currency derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | — |  | 39 |  | — |  | 23 |
Other deferred charges and assets/Other deferred credits and liabilities | — |  | 40 |  | 87 |  | — |
Total derivatives designated as hedging instruments in cash flow and fair value hedges | $ | 27 |  | $ | 113 |  | $ | 110 |  | $ | 28 |
Derivatives not designated as hedging instruments |  |  |  |
Energy-related derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | $ | 9 |  | $ | 4 |  | $ | 388 |  | $ | 331 |
Other deferred charges and assets/Other deferred credits and liabilities | 1 |  | — |  | 270 |  | 232 |
Total derivatives not designated as hedging instruments | $ | 10 |  | $ | 4 |  | $ | 658 |  | $ | 563 |
Gross amounts recognized | $ | 238 |  | $ | 153 |  | $ | 810 |  | $ | 621 |
Gross amounts offset(a) | $ | (25) |  | $ | (28) |  | $ | (529) |  | $ | (557) |
Net amounts recognized in the Balance Sheets(b) | $ | 213 |  | $ | 125 |  | $ | 281 |  | $ | 64 |
| 2021 | 2020
Derivative Category and Balance Sheet Location | Assets | Liabilities | Assets | Liabilities
| (in millions)
Alabama Power |  |  |  |
Derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Energy-related derivatives: |  |  |  |
Other current assets/Other current liabilities | $ | 30 |  | $ | 9 |  | $ | 7 |  | $ | 2 |
Other deferred charges and assets/Other deferred credits and liabilities | 25 |  | 2 |  | 5 |  | 5 |
Total derivatives designated as hedging instruments for regulatory purposes | $ | 55 |  | $ | 11 |  | $ | 12 |  | $ | 7 |
Gross amounts offset | $ | (5) |  | $ | (5) |  | $ | (7) |  | $ | (7) |
Net amounts recognized in the Balance Sheets | $ | 50 |  | $ | 6 |  | $ | 5 |  | $ | — |
Georgia Power |  |  |  |
Derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Energy-related derivatives: |  |  |  |
Other current assets/Other current liabilities | $ | 54 |  | $ | 6 |  | $ | 7 |  | $ | 5 |
Other deferred charges and assets/Other deferred credits and liabilities | 21 |  | 2 |  | 8 |  | 8 |
Total derivatives designated as hedging instruments for regulatory purposes | $ | 75 |  | $ | 8 |  | $ | 15 |  | $ | 13 |
Gross amounts offset | $ | (8) |  | $ | (8) |  | $ | (12) |  | $ | (12) |
Net amounts recognized in the Balance Sheets | $ | 67 |  | $ | — |  | $ | 3 |  | $ | 1 |
Mississippi Power |  |  |  |
Derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Energy-related derivatives: |  |  |  |
Other current assets/Other current liabilities | $ | 30 |  | $ | 3 |  | $ | 4 |  | $ | 3 |
Other deferred charges and assets/Other deferred credits and liabilities | 26 |  | 2 |  | 5 |  | 6 |
Total derivatives designated as hedging instruments for regulatory purposes | $ | 56 |  | $ | 5 |  | $ | 9 |  | $ | 9 |
Gross amounts offset | $ | (4) |  | $ | (4) |  | $ | (7) |  | $ | (7) |
Net amounts recognized in the Balance Sheets | $ | 52 |  | $ | 1 |  | $ | 2 |  | $ | 2 |
| 2021 | 2020
Derivative Category and Balance Sheet Location | Assets | Liabilities | Assets | Liabilities
| (in millions)
Southern Power |  |  |  |
Derivatives designated as hedging instruments in cash flow and fair value hedges |  |  |  |
Energy-related derivatives: |  |  |  |
Other current assets/Other current liabilities | $ | 2 |  | $ | — |  | $ | 2 |  | $ | 2 |
Other deferred charges and assets/Other deferred credits and liabilities | 1 |  | — |  | — |  | — |
Foreign currency derivatives: |  |  |  |
Other current assets/Other current liabilities | — |  | 16 |  | — |  | 23 |
Other deferred charges and assets/Other deferred credits and liabilities | — |  | — |  | 87 |  | — |
Total derivatives designated as hedging instruments in cash flow and fair value hedges | $ | 3 |  | $ | 16 |  | $ | 89 |  | $ | 25 |
Derivatives not designated as hedging instruments |  |  |  |
Energy-related derivatives: |  |  |  |
Other current assets/Other current liabilities | $ | 1 |  | $ | — |  | $ | — |  | $ | 1 |
Net amounts recognized in the Balance Sheets | $ | 4 |  | $ | 16 |  | $ | 89 |  | $ | 26 |
Southern Company Gas |  |  |  |
Derivatives designated as hedging instruments for regulatory purposes |  |  |  |
Energy-related derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | $ | 15 |  | $ | 12 |  | $ | 6 |  | $ | 1 |
Derivatives designated as hedging instruments in cash flow and fair value hedges |  |  |  |
Energy-related derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | $ | 5 |  | $ | 5 |  | $ | 1 |  | $ | 3 |
Interest rate derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | 6 |  | — |  | — |  | — |
Other deferred charges and assets/Other deferred credits and liabilities | — |  | 6 |  | — |  | — |
Total derivatives designated as hedging instruments in cash flow and fair value hedges | $ | 11 |  | $ | 11 |  | $ | 1 |  | $ | 3 |
Derivatives not designated as hedging instruments |  |  |  |
Energy-related derivatives: |  |  |  |
Assets from risk management activities/Other current liabilities | $ | 8 |  | $ | 4 |  | $ | 388 |  | $ | 330 |
Other deferred charges and assets/Other deferred credits and liabilities | 1 |  | — |  | 270 |  | 232 |
Total derivatives not designated as hedging instruments | $ | 9 |  | $ | 4 |  | $ | 658 |  | $ | 562 |
Gross amounts recognized | $ | 35 |  | $ | 27 |  | $ | 665 |  | $ | 566 |
Gross amounts offset(a) | $ | (8) |  | $ | (11) |  | $ | (503) |  | $ | (531) |
Net amounts recognized in the Balance Sheets (b) | $ | 27 |  | $ | 16 |  | $ | 162 |  | $ | 35 |
(a)Gross amounts offset include cash collateral held on deposit in broker margin accounts of $3 million and $28 million at December 31, 2021 and 2020, respectively. (b)Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
Pre-tax effects on the balance sheets | At December 31, 2021 and 2020, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows:
Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheets
Derivative Category and Balance Sheet Location | Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Company Gas
| (in millions)
At December 31, 2021: |  |  |  |  |
Energy-related derivatives: |  |  |  |  |
Other regulatory assets, current | $ | (17) |  | $ | (6) |  | $ | — |  | $ | — |  | $ | (11) |
Other regulatory liabilities, current | 107 |  | 28 |  | 48 |  | 27 |  | 4 |
Other regulatory liabilities, deferred | 65 |  | 22 |  | 19 |  | 24 |  | — |
Total energy-related derivative gains (losses) | $ | 155 |  | $ | 44 |  | $ | 67 |  | $ | 51 |  | $ | (7) |
At December 31, 2020: |  |  |  |  |
Energy-related derivatives: |  |  |  |  |
Other regulatory assets, deferred | $ | (2) |  | $ | — |  | $ | (1) |  | $ | (1) |  | $ | — |
Other regulatory liabilities, current | 12 |  | 5 |  | 2 |  | 1 |  | 4 |
Other regulatory liabilities, deferred | 2 |  | 1 |  | 1 |  | — |  | — |
Total energy-related derivative gains (losses) | $ | 12 |  | $ | 6 |  | $ | 2 |  | $ | — |  | $ | 4 |
Pre-tax effects of hedging on AOCI | For the years ended December 31, 2021, 2020, and 2019, the pre-tax effects of cash flow and fair value hedge accounting on AOCI for the applicable Registrants were as follows:
Gain (Loss) From Derivatives Recognized in OCI | 2021 | 2020 | 2019
| (in millions)
Southern Company |  |  |
Cash flow hedges: |  |  |
Energy-related derivatives | $ | 34 |  | $ | (8) |  | $ | (13) |
Interest rate derivatives | 5 |  | (26) |  | (57) |
Foreign currency derivatives | (103) |  | 48 |  | (84) |
Fair value hedges(*): |  |  |
Foreign currency derivatives | (3) |  | — |  | — |
Total | $ | (67) |  | $ | 14 |  | $ | (154) |
Georgia Power |  |  |
Cash flow hedges: |  |  |
Interest rate derivatives | $ | — |  | $ | (3) |  | $ | (59) |
Southern Power |  |  |
Cash flow hedges: |  |  |
Energy-related derivatives | $ | 12 |  | $ | (2) |  | $ | (4) |
Foreign currency derivatives | (103) |  | 48 |  | (84) |
Total | $ | (91) |  | $ | 46 |  | $ | (88) |
Southern Company Gas |  |  |
Cash flow hedges: |  |  |
Energy-related derivatives | $ | 22 |  | $ | (6) |  | $ | (9) |
Interest rate derivatives | — |  | (23) |  | 2 |
Total | $ | 22 |  | $ | (29) |  | $ | (7) |
(*)Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
Pre-tax effect of interest rate and energy related derivatives | The pre-tax effects of cash flow and fair value hedge accounting on income for the years ended December 31, 2021, 2020, and 2019 were as follows:
Location and Amount of Gain (Loss) Recognized in Income on Cash Flow and Fair Value Hedging Relationships | 2021 | 2020 | 2019
| (in millions)
Southern Company |  |  |
Total cost of natural gas | $ | 1,619 |  | $ | 972 |  | $ | 1,319 |
Gain (loss) on energy-related cash flow hedges(a) | 17 |  | (8) |  | (2) |
Total depreciation and amortization | 3,565 |  | 3,518 |  | 3,038 |
Gain (loss) on energy-related cash flow hedges(a) | 9 |  | (3) |  | (6) |
Total interest expense, net of amounts capitalized | (1,837) |  | (1,821) |  | (1,736) |
Gain (loss) on interest rate cash flow hedges(a) | (27) |  | (26) |  | (20) |
Gain (loss) on foreign currency cash flow hedges(a) | (24) |  | (23) |  | (24) |
Gain (loss) on interest rate fair value hedges(b) | (30) |  | 27 |  | 42 |
Total other income (expense), net | 456 |  | 336 |  | 252 |
Gain (loss) on foreign currency cash flow hedges(a)(c) | (104) |  | 114 |  | (24) |
Gain (loss) on foreign currency fair value hedges | (63) |  | — |  | — |
Amount excluded from effectiveness testing recognized in earnings | 3 |  | — |  | — |
Southern Power |  |  |
Total depreciation and amortization | $ | 517 |  | $ | 494 |  | $ | 479 |
Gain (loss) on energy-related cash flow hedges(a) | 9 |  | (3) |  | (6) |
Total interest expense, net of amounts capitalized | (147) |  | (151) |  | (169) |
Gain (loss) on foreign currency cash flow hedges(a) | (24) |  | (23) |  | (24) |
Total other income (expense), net | 10 |  | 19 |  | 47 |
Gain (loss) on foreign currency cash flow hedges(a)(c) | (104) |  | 114 |  | (24) |
Southern Company Gas |  |  |
Total cost of natural gas | $ | 1,619 |  | $ | 972 |  | $ | 1,319 |
Gain (loss) on energy-related cash flow hedges(a) | 17 |  | (8) |  | (2) |
(a)Reclassified from AOCI into earnings. (b)For fair value hedges, changes in the fair value of the derivative contracts are generally equal to changes in the fair value of the underlying debt and have no material impact on income. (c)The reclassification from AOCI into other income (expense), net completely offsets currency gains and losses arising from changes in the U.S. currency exchange rates used to record the euro-denominated notes.
Schedule of fair value hedging instruments, statements of financial performance and financial position, location | At December 31, 2021 and 2020, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges:
| Carrying Amount of the Hedged Item |  | Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item
Balance Sheet Location of Hedged Items | At December 31, 2021 | At December 31, 2020 |  | At December 31, 2021 | At December 31, 2020
| (in millions) |  | (in millions)
Southern Company |  |  |  |  |
Securities due within one year | $ | — |  | $ | (1,509) |  |  | $ | — |  | $ | (10) |
Long-term debt | (3,280) |  | — |  |  | 9 |  | — |
Southern Company Gas |  |  |  |  |
Long-term debt | $ | (493) |  | $ | — |  |  | $ | 2 |  | $ | — |
Pre-tax effect of interest rate and energy related derivatives | The pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas for the years ended December 31, 2021, 2020, and 2019 were as follows:
|  | Gain (Loss)
Derivatives in Non-Designated Hedging Relationships | Statements of Income Location | 2021 |  | 2020 |  | 2019
|  | (in millions)
Energy-related derivatives | Natural gas revenues(*) | $ | (117) |  |  | $ | 134 |  |  | $ | 223 |
| Cost of natural gas | (27) |  |  | 15 |  |  | 10 |
Total derivatives in non-designated hedging relationships | $ | (144) |  |  | $ | 149 |  |  | $ | 233 |
(*) Excludes the impact of weather derivatives recorded in natural gas revenues of $9 million and $3 million for 2020 and 2019, respectively, as they are accounted for based on intrinsic value rather than fair value. There was no weather derivatives impact for 2021.

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