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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table disaggregates revenue from contracts with customers for the periods presented:
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2021 |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Retail electric revenues |  |  |  |  |  |
Residential | $ | 6,207 |  | $ | 2,467 |  | $ | 3,471 |  | $ | 269 |  | $ | — |  | $ | — |
Commercial | 4,877 |  | 1,600 |  | 3,010 |  | 267 |  | — |  | — |
Industrial | 3,067 |  | 1,386 |  | 1,391 |  | 290 |  | — |  | — |
Other | 93 |  | 17 |  | 68 |  | 8 |  | — |  | — |
Total retail electric revenues | 14,244 |  | 5,470 |  | 7,940 |  | 834 |  | — |  | — |
Natural gas distribution revenues |  |  |  |  |  |
Residential | 1,799 |  | — |  | — |  | — |  | — |  | 1,799 |
Commercial | 470 |  | — |  | — |  | — |  | — |  | 470 |
Transportation | 1,038 |  | — |  | — |  | — |  | — |  | 1,038 |
Industrial | 49 |  | — |  | — |  | — |  | — |  | 49 |
Other | 269 |  | — |  | — |  | — |  | — |  | 269 |
Total natural gas distribution revenues | 3,625 |  | — |  | — |  | — |  | — |  | 3,625 |
Wholesale electric revenues |  |  |  |  |  |
PPA energy revenues | 1,122 |  | 184 |  | 95 |  | 11 |  | 854 |  | — |
PPA capacity revenues | 493 |  | 115 |  | 55 |  | 5 |  | 323 |  | — |
Non-PPA revenues | 236 |  | 170 |  | 21 |  | 401 |  | 398 |  | — |
Total wholesale electric revenues | 1,851 |  | 469 |  | 171 |  | 417 |  | 1,575 |  | — |
Other natural gas revenues |  |  |  |  |  |
Wholesale gas services | 2,168 |  | — |  | — |  | — |  | — |  | 2,168 |
Gas marketing services | 464 |  | — |  | — |  | — |  | — |  | 464 |
Other natural gas revenues | 36 |  | — |  | — |  | — |  | — |  | 36 |
Total natural gas revenues | 2,668 |  | — |  | — |  | — |  | — |  | 2,668 |
Other revenues | 1,075 |  | 202 |  | 452 |  | 31 |  | 30 |  | — |
Total revenue from contracts with customers | 23,463 |  | 6,141 |  | 8,563 |  | 1,282 |  | 1,605 |  | 6,293 |
Other revenue sources(a) | 3,349 |  | 272 |  | 697 |  | 40 |  | 611 |  | 1,786 |
Other adjustments(b) | (3,699) |  | — |  | — |  | — |  | — |  | (3,699) |
Total operating revenues | $ | 23,113 |  | $ | 6,413 |  | $ | 9,260 |  | $ | 1,322 |  | $ | 2,216 |  | $ | 4,380 |
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2020 |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Retail electric revenues |  |  |  |  |  |
Residential | $ | 6,113 |  | $ | 2,377 |  | $ | 3,476 |  | $ | 260 |  | $ | — |  | $ | — |
Commercial | 4,699 |  | 1,512 |  | 2,933 |  | 254 |  | — |  | — |
Industrial | 2,775 |  | 1,293 |  | 1,197 |  | 285 |  | — |  | — |
Other | 90 |  | 21 |  | 60 |  | 9 |  | — |  | — |
Total retail electric revenues | 13,677 |  | 5,203 |  | 7,666 |  | 808 |  | — |  | — |
Natural gas distribution revenues |  |  |  |  |  |
Residential | 1,338 |  | — |  | — |  | — |  | — |  | 1,338 |
Commercial | 340 |  | — |  | — |  | — |  | — |  | 340 |
Transportation | 971 |  | — |  | — |  | — |  | — |  | 971 |
Industrial | 30 |  | — |  | — |  | — |  | — |  | 30 |
Other | 209 |  | — |  | — |  | — |  | — |  | 209 |
Total natural gas distribution revenues | 2,888 |  | — |  | — |  | — |  | — |  | 2,888 |
Wholesale electric revenues |  |  |  |  |  |
PPA energy revenues | 735 |  | 133 |  | 42 |  | 9 |  | 570 |  | — |
PPA capacity revenues | 454 |  | 108 |  | 50 |  | 3 |  | 296 |  | — |
Non-PPA revenues | 210 |  | 43 |  | 10 |  | 311 |  | 239 |  | — |
Total wholesale electric revenues | 1,399 |  | 284 |  | 102 |  | 323 |  | 1,105 |  | — |
Other natural gas revenues |  |  |  |  |  |
Wholesale gas services | 1,727 |  | — |  | — |  | — |  | — |  | 1,727 |
Gas marketing services | 391 |  | — |  | — |  | — |  | — |  | 391 |
Other natural gas revenues | 33 |  | — |  | — |  | — |  | — |  | 33 |
Total other natural gas revenues | 2,151 |  | — |  | — |  | — |  | — |  | 2,151 |
Other revenues | 982 |  | 159 |  | 447 |  | 26 |  | 14 |  | — |
Total revenue from contracts with customers | 21,097 |  | 5,646 |  | 8,215 |  | 1,157 |  | 1,119 |  | 5,039 |
Other revenue sources(a) | 3,764 |  | 184 |  | 94 |  | 15 |  | 614 |  | 2,881 |
Other adjustments(b) | (4,486) |  | — |  | — |  | — |  | — |  | (4,486) |
Total operating revenues | $ | 20,375 |  | $ | 5,830 |  | $ | 8,309 |  | $ | 1,172 |  | $ | 1,733 |  | $ | 3,434 |
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
2019 |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Retail electric revenues |  |  |  |  |  |
Residential | $ | 6,164 |  | $ | 2,509 |  | $ | 3,377 |  | $ | 278 |  | $ | — |  | $ | — |
Commercial | 5,065 |  | 1,677 |  | 3,097 |  | 291 |  | — |  | — |
Industrial | 3,126 |  | 1,460 |  | 1,360 |  | 306 |  | — |  | — |
Other | 90 |  | 25 |  | 54 |  | 11 |  | — |  | — |
Total retail electric revenues | 14,445 |  | 5,671 |  | 7,888 |  | 886 |  | — |  | — |
Natural gas distribution revenues |  |  |  |  |  |
Residential | 1,413 |  | — |  | — |  | — |  | — |  | 1,413 |
Commercial | 389 |  | — |  | — |  | — |  | — |  | 389 |
Transportation | 907 |  | — |  | — |  | — |  | — |  | 907 |
Industrial | 35 |  | — |  | — |  | — |  | — |  | 35 |
Other | 245 |  | — |  | — |  | — |  | — |  | 245 |
Total natural gas distribution revenues | 2,989 |  | — |  | — |  | — |  | — |  | 2,989 |
Wholesale electric revenues |  |  |  |  |  |
PPA energy revenues | 833 |  | 145 |  | 60 |  | 11 |  | 648 |  | — |
PPA capacity revenues | 453 |  | 102 |  | 54 |  | 3 |  | 322 |  | — |
Non-PPA revenues | 232 |  | 81 |  | 9 |  | 352 |  | 238 |  | — |
Total wholesale electric revenues | 1,518 |  | 328 |  | 123 |  | 366 |  | 1,208 |  | — |
Other natural gas revenues |  |  |  |  |  |
Gas pipeline investments | 32 |  | — |  | — |  | — |  | — |  | 32 |
Wholesale gas services | 2,095 |  | — |  | — |  | — |  | — |  | 2,095 |
Gas marketing services | 440 |  | — |  | — |  | — |  | — |  | 440 |
Other natural gas revenues | 42 |  | — |  | — |  | — |  | — |  | 42 |
Total other natural gas revenues | 2,609 |  | — |  | — |  | — |  | — |  | 2,609 |
Other revenues | 1,035 |  | 153 |  | 407 |  | 19 |  | 12 |  | — |
Total revenue from contracts with customers | 22,596 |  | 6,152 |  | 8,418 |  | 1,271 |  | 1,220 |  | 5,598 |
Other revenue sources(a) | 4,266 |  | (27) |  | (10) |  | (7) |  | 718 |  | 3,637 |
Other adjustments(b) | (5,443) |  | — |  | — |  | — |  | — |  | (5,443) |
Total operating revenues | $ | 21,419 |  | $ | 6,125 |  | $ | 8,408 |  | $ | 1,264 |  | $ | 1,938 |  | $ | 3,792 |
(a)Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies. (b)Other adjustments relate to the cost of Southern Company Gas' energy and risk management activities. Wholesale gas services revenues are presented net of the related costs of those activities on the statement of income. See Notes 15 and 16 under "Southern Company Gas" for information on the sale of Sequent and components of wholesale gas services' operating revenues, respectively.
Contract with customer, asset and liability | The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 2021 and 2020:
| Southern Company | Alabama Power | Georgia Power | Mississippi Power | Southern Power | Southern Company Gas
| (in millions)
Accounts Receivable |  |  |  |  |  |
At December 31, 2021 | $ | 2,504 |  | $ | 589 |  | $ | 736 |  | $ | 73 |  | $ | 149 |  | $ | 753 |
At December 31, 2020 | 2,614 |  | 632 |  | 806 |  | 77 |  | 112 |  | 788 |
Contract Assets |  |  |  |  |  |
At December 31, 2021 | $ | 117 |  | $ | 2 |  | $ | 63 |  | $ | — |  | $ | 1 |  | $ | — |
At December 31, 2020 | 158 |  | 2 |  | 71 |  | — |  | — |  | — |
Contract Liabilities |  |  |  |  |  |
At December 31, 2021 | $ | 57 |  | $ | 4 |  | $ | 14 |  | $ | — |  | $ | 1 |  | $ | — |
At December 31, 2020 | 61 |  | 6 |  | 27 |  | 1 |  | 1 |  | 1 |
Revenues recognized in 2021 and 2020, which were included in contract liabilities at December 31, 2020 and December 31, 2019, respectively, were $29 million and $33 million, respectively, for Southern Company and immaterial for the other Registrants.
Revenue, remaining performance obligation, expected timing of satisfaction | Revenues from contracts with customers related to these performance obligations remaining at December 31, 2021 are expected to be recognized as follows:
| 2022 | 2023 | 2024 | 2025 | 2026 | Thereafter
| (in millions)
Southern Company | $ | 577 |  | $ | 462 |  | $ | 341 |  | $ | 319 |  | $ | 295 |  | $ | 2,309 |
Alabama Power | 33 |  | 24 |  | 7 |  | 5 |  | — |  | — |
Georgia Power | 68 |  | 48 |  | 25 |  | 22 |  | 11 |  | 31 |
Southern Power | 331 |  | 293 |  | 309 |  | 292 |  | 287 |  | 2,294 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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