REVENUE FROM CONTRACTS WITH CUSTOMERS AND LEASE INCOME (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables disaggregate revenue from contracts with customers for the three months ended March 31, 2020 and 2019:

Three Months Ended March 31, 2020	Southern Company			Alabama Power			Georgia Power			Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Operating revenues
Retail electric revenues
Residential	$	1,370		$	553		$	760		$	57	$	—	$	—
Commercial	1,146			364			720			62		—		—
Industrial	680			321			281			78		—		—
Other	23			5			16			2		—		—
Total retail electric revenues	3,219			1,243			1,777			199		—		—
Natural gas distribution revenues
Residential	496			—			—			—		—		496
Commercial	130			—			—			—		—		130
Transportation	264			—			—			—		—		264
Industrial	12			—			—			—		—		12
Other	97			—			—			—		—		97
Total natural gas distribution revenues	999			—			—			—		—		999
Wholesale electric revenues
PPA energy revenues	159			27			9			2		125		—
PPA capacity revenues	105			27			12			1		66		—
Non-PPA revenues	51			19			2			69		58		—
Total wholesale electric revenues	315			73			23			72		249		—
Other natural gas revenues
Wholesale gas services	396			—			—			—		—		396
Gas marketing services	163			—			—			—		—		163
Other natural gas revenues	7			—			—			—		—		7
Total natural gas revenues	566			—			—			—		—		566
Other revenues	192			37			95			5		3		—
Total revenue from contracts with customers	5,291			1,353			1,895			276		252		1,565
Other revenue sources(a)	868			(2		)	(70		)	1		123		825
Other adjustments(b)	(1,141		)	—			—			—		—		(1,141		)
Total operating revenues	$	5,018		$	1,351		$	1,825		$	277	$	375	$	1,249

(a) Other revenue sources primarily relate to revenues from customers accounted for as derivatives and leases, as well as alternative revenue programs at Southern Company Gas and other cost recovery mechanisms 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 Note (L) under "Southern Company Gas" for additional information on the components of wholesale gas services' operating revenues.

Three Months Ended March 31, 2019	Southern Company			Alabama Power			Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Operating revenues
Retail electric revenues
Residential	$	1,327		$	559		$	708	$	60	$	—	$	—
Commercial	1,125			368			692		65		—		—
Industrial	708			338			296		74		—		—
Other	21			6			11		4		—		—
Total retail electric revenues	3,181			1,271			1,707		203		—		—
Natural gas distribution revenues
Residential	601			—			—		—		—		601
Commercial	170			—			—		—		—		170
Transportation	256			—			—		—		—		256
Industrial	17			—			—		—		—		17
Other	116			—			—		—		—		116
Total natural gas distribution revenues	1,160			—			—		—		—		1,160
Wholesale electric revenues
PPA energy revenues	190			31			12		3		151		—
PPA capacity revenues	107			27			13		1		81		—
Non-PPA revenues	55			60			2		74		41		—
Total wholesale electric revenues	352			118			27		78		273		—
Other natural gas revenues
Wholesale gas services	721			—			—		—		—		721
Gas marketing services	221			—			—		—		—		221
Other natural gas revenues	10			—			—		—		—		10
Total natural gas revenues	952			—			—		—		—		952
Other revenues	266			46			92		5		4		—
Total revenue from contracts with customers	5,911			1,435			1,826		286		277		2,112
Other revenue sources(a)	1,361			(27		)	7		1		166		1,222
Other adjustments(b)	(1,860		)	—			—		—		—		(1,860		)
Total operating revenues	$	5,412		$	1,408		$	1,833	$	287	$	443	$	1,474

(a) Other revenue sources primarily relate to revenues from customers accounted for as derivatives and leases, as well as alternative revenue programs at Southern Company Gas and other cost recovery mechanisms 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 Note (L) under "Southern Company Gas" for additional information on the components of wholesale gas services' operating revenues.

Contract with Customer, Asset and Liability and Revenue Recognized

The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at March 31, 2020 and December 31, 2019:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Accounts Receivables
As of March 31, 2020	$	2,224	$	518	$	697	$	70	$	86	$	696
As of December 31, 2019	2,413		586		688		79		97		749
Contract Assets
As of March 31, 2020	$	100	$	—	$	53	$	3	$	—	$	—
As of December 31, 2019	117		—		69		—		—		—
Contract Liabilities
As of March 31, 2020	$	49	$	7	$	11	$	—	$	1	$	1
As of December 31, 2019	52		10		13		—		1		1

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Revenue from contracts with customers related to these performance obligations remaining at March 31, 2020 are expected to be recognized as follows:

	2020 (remaining)		2021		2022		2023		2024		2025 and Thereafter
	(in millions)
Southern Company	$	367	$	416	$	354	$	334	$	314	$	2,164
Alabama Power	23		33		31		24		7		5
Georgia Power	52		66		36		34		23		61
Southern Power	224		285		287		277		285		2,116

Summary of Lease Income

Lease income for the three months ended March 31, 2020 and 2019 is as follows:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
For the Three Months Ended March 31, 2020
Lease income - interest income on sales-type leases	$	3	$	—	$	—	$	3	$	—	$	—
Lease income - operating leases	51		6		16		—		24		9
Variable lease income	74		—		—		—		80		—
Total lease income	$	128	$	6	$	16	$	3	$	104	$	9
For the Three Months Ended March 31, 2019
Lease income - interest income on sales-type leases	$	2	$	—	$	—	$	2	$	—	$	—
Lease income - operating leases	71		7		19		—		46		9
Variable lease income	66		—		—		—		75		—
Total lease income	$	139	$	7	$	19	$	2	$	121	$	9