XML 186 R143.htm IDEA: XBRL DOCUMENT v3.22.4

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregate Revenue Sources (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 25,941	$ 23,463	$ 21,097
Total operating revenues	29,279	23,113	20,375
Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15,839	14,244	13,677
Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,604	6,207	6,113
Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,369	4,877	4,699
Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,764	3,067	2,775
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	102	93	90
Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,218	3,625	2,888
Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,843	1,799	1,338
Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	763	470	340
Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,186	1,038	971
Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	84	49	30
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	342	269	209
Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,120	1,851	1,399
PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,274	1,122	735
PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	596	493	454
Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	250	236	210
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	687	2,668	2,151
Wholesale gas services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		2,168	1,727
Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	636	464	391
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	51	36	33
Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,077	1,075	982
Other revenue sources
Disaggregation of Revenue [Line Items]
Other	3,338	3,349	3,764
Other adjustments
Disaggregation of Revenue [Line Items]
Other		(3,699)	(4,486)
Alabama Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,921	6,141	5,646
Total operating revenues	7,817	6,413	5,830
Alabama Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,844	5,470	5,203
Alabama Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,638	2,467	2,377
Alabama Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,685	1,600	1,512
Alabama Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,507	1,386	1,293
Alabama Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14	17	21
Alabama Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	883	469	284
Alabama Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	489	184	133
Alabama Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	194	115	108
Alabama Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	200	170	43
Alabama Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Wholesale gas services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	0
Alabama Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Alabama Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	194	202	159
Alabama Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	896	272	184
Alabama Power | Other adjustments
Disaggregation of Revenue [Line Items]
Other		0	0
Georgia Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,702	8,563	8,215
Total operating revenues	11,584	9,260	8,309
Georgia Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,049	7,940	7,666
Georgia Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,664	3,471	3,476
Georgia Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,385	3,010	2,933
Georgia Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,921	1,391	1,197
Georgia Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	79	68	60
Georgia Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	207	171	102
Georgia Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	130	95	42
Georgia Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	47	55	50
Georgia Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	30	21	10
Georgia Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Wholesale gas services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	0
Georgia Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Georgia Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	446	452	447
Georgia Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	1,882	697	94
Georgia Power | Other adjustments
Disaggregation of Revenue [Line Items]
Other		0	0
Mississippi Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,703	1,282	1,157
Total operating revenues	1,694	1,322	1,172
Mississippi Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	946	834	808
Mississippi Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	302	269	260
Mississippi Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	299	267	254
Mississippi Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	336	290	285
Mississippi Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	8	9
Mississippi Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	710	417	323
Mississippi Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	11	9
Mississippi Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	5	3
Mississippi Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	690	401	311
Mississippi Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Wholesale gas services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	0
Mississippi Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Mississippi Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	47	31	26
Mississippi Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	(9)	40	15
Mississippi Power | Other adjustments
Disaggregation of Revenue [Line Items]
Other		0	0
Southern Power
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,805	1,605	1,119
Total operating revenues	3,369	2,216	1,733
Southern Power | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,769	1,575	1,105
Southern Power | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,673	854	570
Southern Power | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	356	323	296
Southern Power | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	740	398	239
Southern Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Wholesale gas services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		0	0
Southern Power | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Power | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36	30	14
Southern Power | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	564	611	614
Southern Power | Other adjustments
Disaggregation of Revenue [Line Items]
Other		0	0
Southern Company Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,905	6,293	5,039
Total operating revenues	5,962	4,380	3,434
Southern Company Gas | Retail electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,218	3,625	2,888
Southern Company Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,843	1,799	1,338
Southern Company Gas | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	763	470	340
Southern Company Gas | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,186	1,038	971
Southern Company Gas | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	84	49	30
Southern Company Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	342	269	209
Southern Company Gas | Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | PPA energy revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | PPA capacity revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Non-PPA revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	687	2,668	2,151
Southern Company Gas | Wholesale gas services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		2,168	1,727
Southern Company Gas | Gas marketing services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	636	464	391
Southern Company Gas | Other natural gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	51	36	33
Southern Company Gas | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0
Southern Company Gas | Other revenue sources
Disaggregation of Revenue [Line Items]
Other	$ 57	1,786	2,881
Southern Company Gas | Other adjustments
Disaggregation of Revenue [Line Items]
Other		$ (3,699)	$ (4,486)

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue that is not accounted for under Topic 606.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

Name:	us-gaap_RevenueNotFromContractWithCustomer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI https://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756

Reference 22: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=so_RetailElectricMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_RetailElectricResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_RetailElectricCommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_RetailElectricIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_RetailElectricOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_NaturalGasDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_NaturalGasDistributionResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_NaturalGasDistributionCommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_NaturalGasDistributionTransportationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_NaturalGasDistributionIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_NaturalGasDistributionOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_WholesaleElectricRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_WholesaleElectricPPAEnergyRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_WholesaleElectricPPACapacityRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_WholesaleElectricNonPPARevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherNaturalGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherNaturalGasWholesaleGasServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherNaturalGasGasMarketingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherNaturalGasOtherNaturalGasRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherRevenueSourcesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=so_OtherAdjustmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=so_AlabamaPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=so_GeorgiaPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=so_MississippiPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=so_SouthernPowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=so_SouthernCompanyGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: