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RETIREMENT BENEFITS - Changes in Projected Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | $ 13,252 | $ 12,602 |
Service cost | 292 | 275 | $ 412
Interest cost | 635 | 626 | 408
Benefits paid | (728) | (744) |
Actuarial gain | (887) | 493 |
Balance at end of year | 12,564 | 13,252 | 12,602
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 14,618 | 14,218 |
Actual return on plan assets | 604 | 1,092 |
Employer contributions | 65 | 52 |
Benefits paid | (728) | (744) |
Fair value of plan assets at end of year | 14,559 | 14,618 | 14,218
Accrued asset | 1,995 | 1,366 |
Other postretirement benefit plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 1,386 | 1,441 |
Service cost | 15 | 15 | 23
Interest cost | 65 | 70 | 42
Benefits paid | (105) | (107) |
Actuarial gain | (2) | (33) |
Balance at end of year | 1,359 | 1,386 | 1,441
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 1,095 | 998 |
Actual return on plan assets | 96 | 131 |
Employer contributions | 55 | 73 |
Benefits paid | (105) | (107) |
Fair value of plan assets at end of year | 1,141 | 1,095 | 998
Accrued asset | (218) | (291) |
Alabama Power | Pension plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 3,076 | 2,906 |
Service cost | 68 | 64 | 99
Interest cost | 148 | 145 | 96
Benefits paid | (162) | (155) |
Actuarial gain | (222) | 116 |
Balance at end of year | 2,908 | 3,076 | 2,906
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,544 | 3,427 |
Actual return on plan assets | 148 | 260 |
Employer contributions | 9 | 11 |
Benefits paid | (162) | (154) |
Fair value of plan assets at end of year | 3,539 | 3,544 | 3,427
Accrued asset | 631 | 468 |
Alabama Power | Other postretirement benefit plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 329 | 344 |
Service cost | 4 | 4 | 6
Interest cost | 16 | 17 | 10
Benefits paid | (25) | (24) |
Actuarial gain | 2 | (12) |
Balance at end of year | 326 | 329 | 344
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 403 | 372 |
Actual return on plan assets | 37 | 52 |
Employer contributions | 6 | 3 |
Benefits paid | (25) | (24) |
Fair value of plan assets at end of year | 421 | 403 | 372
Accrued asset | 95 | 74 |
Georgia Power | Pension plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 4,009 | 3,851 |
Service cost | 70 | 68 | 103
Interest cost | 191 | 191 | 123
Benefits paid | (239) | (224) |
Actuarial gain | (298) | 123 |
Balance at end of year | 3,733 | 4,009 | 3,851
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 4,571 | 4,456 |
Actual return on plan assets | 152 | 331 |
Employer contributions | 35 | 9 |
Benefits paid | (239) | (225) |
Fair value of plan assets at end of year | 4,519 | 4,571 | 4,456
Accrued asset | 786 | 562 |
Georgia Power | Other postretirement benefit plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 489 | 514 |
Service cost | 4 | 4 | 6
Interest cost | 23 | 25 | 15
Benefits paid | (37) | (36) |
Actuarial gain | 9 | (18) |
Balance at end of year | 488 | 489 | 514
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 410 | 368 |
Actual return on plan assets | 34 | 51 |
Employer contributions | 13 | 27 |
Benefits paid | (37) | (36) |
Fair value of plan assets at end of year | 420 | 410 | 368
Accrued asset | (68) | (79) |
Mississippi Power | Pension plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 599 | 569 |
Service cost | 12 | 11 | 17
Interest cost | 29 | 28 | 18
Benefits paid | (33) | (32) |
Actuarial gain | (40) | 23 |
Balance at end of year | 567 | 599 | 569
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 669 | 649 |
Actual return on plan assets | 23 | 50 |
Employer contributions | 5 | 2 |
Benefits paid | (33) | (32) |
Fair value of plan assets at end of year | 664 | 669 | 649
Accrued asset | 97 | 70 |
Mississippi Power | Other postretirement benefit plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 57 | 59 |
Service cost | 1 | 1 | 1
Interest cost | 3 | 3 | 2
Benefits paid | (4) | (4) |
Actuarial gain | (2) | (2) |
Balance at end of year | 55 | 57 | 59
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 25 | 24 |
Actual return on plan assets | 0 | 2 |
Employer contributions | 3 | 3 |
Benefits paid | (4) | (4) |
Fair value of plan assets at end of year | 24 | 25 | 24
Accrued asset | (31) | (32) |
Southern Power | Pension plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 177 | 163 |
Service cost | 7 | 6 | 9
Interest cost | 9 | 8 | 6
Benefits paid | (6) | (6) |
Actuarial gain | (20) | 6 |
Balance at end of year | 167 | 177 | 163
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 185 | 178 |
Actual return on plan assets | 7 | 12 |
Employer contributions | 2 | 2 |
Benefits paid | (6) | (7) |
Fair value of plan assets at end of year | 188 | 185 | 178
Accrued asset | 21 | 8 |
Southern Power | Other postretirement benefit plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 9 | 9 |
Service cost | 0 | 0 | 0
Interest cost | 0 | 0 | 0
Benefits paid | (1) | (1) |
Actuarial gain | 1 | 1 |
Balance at end of year | 9 | 9 | 9
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 1 | 1 |
Benefits paid | (1) | (1) |
Fair value of plan assets at end of year | 0 | 0 | 0
Accrued asset | (9) | (9) |
Southern Company Gas | Pension plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 882 | 868 |
Service cost | 28 | 24 | 34
Interest cost | 42 | 42 | 28
Benefits paid | (46) | (104) |
Actuarial gain | (64) | 52 |
Balance at end of year | 842 | 882 | 868
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 980 | 1,002 |
Actual return on plan assets | 39 | 79 |
Employer contributions | 5 | 3 |
Benefits paid | (46) | (104) |
Fair value of plan assets at end of year | 978 | 980 | 1,002
Accrued asset | 136 | 98 |
Southern Company Gas | Other postretirement benefit plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 172 | 179 |
Service cost | 1 | 1 | 1
Interest cost | 8 | 9 | 5
Benefits paid | (12) | (18) |
Actuarial gain | (13) | 1 |
Balance at end of year | 156 | 172 | 179
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 128 | 113 |
Actual return on plan assets | 18 | 19 |
Employer contributions | 7 | 14 |
Benefits paid | (12) | (18) |
Fair value of plan assets at end of year | 141 | 128 | $ 113
Accrued asset | $ (15) | $ (44) |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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