REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

12 Months Ended

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