RETIREMENT BENEFITS

12 Months Ended

Dec. 31, 2021

Retirement Benefits [Abstract]

RETIREMENT BENEFITS

RETIREMENT BENEFITSThe Southern Company system has a qualified defined benefit, trusteed pension plan covering substantially all employees, with the exception of PowerSecure employees. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2021 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2022. The Southern Company system also provides certain non-qualified defined benefits for a select group of management and highly compensated employees, which are funded on a cash basis. In addition, the Southern Company system provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund other postretirement trusts to the extent required by their respective regulatory commissions. Southern Company Gas has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 2022, no contributions to any other postretirement trusts are expected.

Actuarial Assumptions

The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.

	2021
Assumptions used to determine net periodic costs:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
Pension plans
Discount rate – benefit obligations	2.81	%	2.85	%	2.79	%	2.80	%	2.99	%	2.75	%
Discount rate – interest costs	2.13		2.17		2.09		2.12		2.46		2.10
Discount rate – service costs	3.18		3.23		3.21		3.20		3.22		2.97
Expected long-term return on plan assets	8.25		8.25		8.25		8.25		8.25		8.25
Annual salary increase	4.80		4.80		4.80		4.80		4.80		4.80
Other postretirement benefit plans
Discount rate – benefit obligations	2.56	%	2.63	%	2.52	%	2.53	%	2.78	%	2.46	%
Discount rate – interest costs	1.84		1.91		1.82		1.78		2.12		1.64
Discount rate – service costs	3.07		3.13		3.08		3.06		3.05		3.01
Expected long-term return on plan assets	7.09		7.18		6.84		6.98		—		6.54
Annual salary increase	4.80		4.80		4.80		4.80		4.80		4.80

	2020
Assumptions used to determine net periodic costs:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
Pension plans
Discount rate – benefit obligations	3.41	%	3.44	%	3.40	%	3.41	%	3.52	%	3.39	%
Discount rate – interest costs	2.99		3.01		2.96		2.99		3.18		2.99
Discount rate – service costs	3.66		3.69		3.67		3.67		3.70		3.53
Expected long-term return on plan assets	8.25		8.25		8.25		8.25		8.25		8.25
Annual salary increase	4.73		4.73		4.73		4.73		4.73		4.73
Other postretirement benefit plans
Discount rate – benefit obligations	3.24	%	3.28	%	3.22	%	3.22	%	3.39	%	3.19	%
Discount rate – interest costs	2.80		2.84		2.79		2.76		2.97		2.71
Discount rate – service costs	3.57		3.61		3.57		3.57		3.57		3.52
Expected long-term return on plan assets	7.25		7.36		7.05		7.07		—		6.69
Annual salary increase	4.73		4.73		4.73		4.73		4.73		4.73

	2019
Assumptions used to determine net periodic costs:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
Pension plans
Discount rate – benefit obligations	4.49	%	4.51	%	4.48	%	4.49	%	4.65	%	4.47	%
Discount rate – interest costs	4.12		4.14		4.10		4.12		4.35		4.11
Discount rate – service costs	4.70		4.73		4.72		4.73		4.75		4.57
Expected long-term return on plan assets	7.75		7.75		7.75		7.75		7.75		7.75
Annual salary increase	4.34		4.46		4.46		4.46		4.46		3.07
Other postretirement benefit plans
Discount rate – benefit obligations	4.37	%	4.40	%	4.36	%	4.35	%	4.50	%	4.32	%
Discount rate – interest costs	3.98		4.01		3.97		3.95		4.14		3.91
Discount rate – service costs	4.63		4.67		4.64		4.64		4.65		4.56
Expected long-term return on plan assets	6.86		6.76		6.85		6.79		—		6.49
Annual salary increase	4.34		4.46		4.46		4.46		4.46		3.07

	2021
Assumptions used to determine benefit obligations:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
Pension plans
Discount rate	3.09	%	3.12	%	3.07	%	3.07	%	3.21	%	3.04	%
Annual salary increase	4.80		4.80		4.80		4.80		4.80		4.80
Other postretirement benefit plans
Discount rate	2.90	%	2.95	%	2.87	%	2.88	%	3.07	%	2.82	%
Annual salary increase	4.80		4.80		4.80		4.80		4.80		4.80

	2020
Assumptions used to determine benefit obligations:	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
Pension plans
Discount rate	2.81	%	2.85	%	2.79	%	2.80	%	2.99	%	2.75	%
Annual salary increase	4.80		4.80		4.80		4.80		4.80		4.80
Other postretirement benefit plans
Discount rate	2.56	%	2.63	%	2.52	%	2.53	%	2.78	%	2.46	%
Annual salary increase	4.80		4.80		4.80		4.80		4.80		4.80

The Registrants estimate the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of the different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio. Prior to 2020, the Registrants set the expected rate of return assumption using asset return modeling based on geometric returns that reflect the compound average returns for dependent annual periods. Beginning in 2020, the Registrants set the expected rate of return assumption using an arithmetic mean which represents the expected simple average return to be earned by the pension plan assets over any one year. The Registrants believe the use of the arithmetic mean is more compatible with the expected rate of return's function of estimating a single year's investment return.

An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO for the Registrants at December 31, 2021 were as follows:

	Initial Cost Trend Rate		Ultimate Cost Trend Rate		Year That Ultimate Rate is Reached
Pre-65	6.00	%	4.50	%	2028
Post-65 medical	5.00		4.50		2028
Post-65 prescription	6.25		4.50		2029

Pension Plans

The total accumulated benefit obligation for the pension plans at December 31, 2021 and 2020 was as follows:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
December 31, 2021	$	14,687	$	3,362	$	4,562	$	672	$	178	$	1,030
December 31, 2020	14,922		3,414		4,657		683		175		1,072

An actuarial gain of $393 million was recorded for the annual remeasurement of the Southern Company system pension plans at December 31, 2021 primarily due to an increase of 28 basis points in the overall discount rate used to calculate the benefit obligation as a result of higher market interest rates. An actuarial loss of $1.7 billion was recorded for the annual remeasurement of the Southern Company system pension plans at December 31, 2020 primarily due to a decrease of 60 basis points in the overall discount rate used to calculate the benefit obligation as a result of lower market interest rates.

Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2021 and 2020 were as follows:

	2021
	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	16,646	$	3,854	$	5,127	$	754	$	217	$	1,189
Service cost	434		102		112		18		10		37
Interest cost	346		82		104		16		5		24
Benefits paid	(651)		(137)		(210)		(28)		(4)		(73)
Actuarial gain	(393)		(95)		(121)		(17)		(6)		(43)
Balance at end of year	16,382		3,806		5,012		743		222		1,134
Change in plan assets
Fair value of plan assets at beginning of year	15,367		3,684		4,844		701		186		1,123
Actual return on plan assets	2,449		586		781		111		30		181
Employer contributions	60		8		—		2		1		10
Benefits paid	(651)		(137)		(210)		(28)		(4)		(73)
Fair value of plan assets at end of year	17,225		4,141		5,415		786		213		1,241
Accrued asset (liability)	$	843	$	335	$	403	$	43	$	(9)	$	107

	2020
	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	14,788	$	3,404	$	4,610	$	671	$	185	$	1,067
Service cost	376		89		96		15		8		33
Interest cost	432		100		133		20		6		31
Benefits paid	(629)		(132)		(202)		(27)		(6)		(69)
Actuarial loss	1,679		393		490		75		24		127
Balance at end of year	16,646		3,854		5,127		754		217		1,189
Change in plan assets
Fair value of plan assets at beginning of year	14,057		3,357		4,442		641		169		1,050
Actual return on plan assets	1,881		450		594		85		22		139
Employer contributions	58		9		10		2		1		3
Benefits paid	(629)		(132)		(202)		(27)		(6)		(69)
Fair value of plan assets at end of year	15,367		3,684		4,844		701		186		1,123
Accrued liability	$	(1,279)	$	(170)	$	(283)	$	(53)	$	(31)	$	(66)

The projected benefit obligations for the qualified and non-qualified pension plans at December 31, 2021 are shown in the following table. All pension plan assets are related to the qualified pension plan.

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Projected benefit obligations:
Qualified pension plan	$	15,568	$	3,678	$	4,852	$	708	$	193	$	1,066
Non-qualified pension plan	814		129		160		36		29		68

Amounts recognized in the balance sheets at December 31, 2021 and 2020 related to the Registrants' pension plans consist of the following:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
December 31, 2021:
Prepaid pension costs(a)	$	1,657	$	464	$	563	$	78	$	20	$	175
Other regulatory assets, deferred(b)	2,920		809		971		146		—		91
Other current liabilities	(55)		(9)		(12)		(2)		(2)		(2)
Employee benefit obligations(c)	(759)		(120)		(148)		(33)		(27)		(66)
Other regulatory liabilities, deferred	(119)		—		—		—		—		—
AOCI	100		—		—		—		35		(45)
December 31, 2020:
Prepaid pension costs	$	—	$	—	$	—	$	—	$	—	$	70
Other regulatory assets, deferred(b)	4,655		1,286		1,598		235		—		205
Other current liabilities	(52)		(9)		(10)		(2)		(2)		(2)
Employee benefit obligations(c)	(1,227)		(161)		(273)		(51)		(29)		(134)
Other regulatory liabilities, deferred	(34)		—		—		—		—		—
AOCI	245		—		—		—		60		1

(a)Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet and other deferred charges and assets on Southern Power's consolidated balance sheet.

(b)Amounts for Southern Company exclude regulatory assets of $210 million and $224 million at December 31, 2021 and 2020, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.

(c)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.

Presented below are the amounts included in regulatory assets at December 31, 2021 and 2020 related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic pension cost.

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Company Gas
	(in millions)
Balance at December 31, 2021
Regulatory assets:
Prior service cost	$	11	$	5	$	8	$	1	$	(11)
Net loss	2,790		804		963		145		38
Regulatory amortization	—		—		—		—		64
Total regulatory assets(*)	$	2,801	$	809	$	971	$	146	$	91
Balance at December 31, 2020
Regulatory assets:
Prior service cost	$	11	$	5	$	9	$	2	$	(13)
Net loss	4,610		1,281		1,589		233		135
Regulatory amortization	—		—		—		—		83
Total regulatory assets(*)	$	4,621	$	1,286	$	1,598	$	235	$	205

(*)Amounts for Southern Company exclude regulatory assets of $210 million and $224 million at December 31, 2021 and 2020, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.

The changes in the balance of regulatory assets related to the portion of the defined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas for the years ended December 31, 2021 and 2020 are presented in the following table:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Company Gas
	(in millions)
Regulatory assets (liabilities):(*)
Balance at December 31, 2019	$	3,993	$	1,130	$	1,416	$	203	$	172
Net loss	884		228		269		45		45
Reclassification adjustments:
Amortization of prior service costs	(1)		(1)		(1)		—		2
Amortization of net loss	(255)		(71)		(86)		(13)		(8)
Amortization of regulatory assets(*)	—		—		—		—		(6)
Total reclassification adjustments	(256)		(72)		(87)		(13)		(12)
Total change	628		156		182		32		33
Balance at December 31, 2020	$	4,621	$	1,286	$	1,598	$	235	$	205
Net gain	(1,523)		(394)		(527)		(74)		(97)
Reclassification adjustments:
Amortization of prior service costs	(1)		(1)		(1)		—		2
Amortization of net loss	(296)		(82)		(99)		(15)		(9)
Amortization of regulatory assets(*)	—		—		—		—		(10)
Total reclassification adjustments	(297)		(83)		(100)		(15)		(17)
Total change	(1,820)		(477)		(627)		(89)		(114)
Balance at December 31, 2021	$	2,801	$	809	$	971	$	146	$	91

(*)Amounts for Southern Company exclude regulatory assets of $210 million and $224 million at December 31, 2021 and 2020, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.

Presented below are the amounts included in AOCI at December 31, 2021 and 2020 related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic pension cost.

	Southern Company		Southern Power		Southern Company Gas
	(in millions)
Balance at December 31, 2021
AOCI:
Prior service cost	$	(2)	$	—	$	(3)
Net (gain) loss	102		35		(42)
Total AOCI	$	100	$	35	$	(45)
Balance at December 31, 2020
AOCI:
Prior service cost	$	(3)	$	—	$	(4)
Net loss	248		60		5
Total AOCI	$	245	$	60	$	1

The components of OCI related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas for the years ended December 31, 2021 and 2020 are presented in the following table:

	Southern Company		Southern Power		Southern Company Gas
	(in millions)
AOCI:
Balance at December 31, 2019	$	185	$	46	$	(14)
Net loss	74		16		15
Reclassification adjustments:
Amortization of prior service costs	—		—		1
Amortization of net loss	(14)		(2)		(1)
Total reclassification adjustments	(14)		(2)		—
Total change	60		14		15
Balance at December 31, 2020	$	245	$	60	$	1
Net gain	(128)		(22)		(47)
Reclassification adjustments:
Amortization of net gain (loss)	(17)		(3)		1
Total reclassification adjustments	(17)		(3)		1
Total change	(145)		(25)		(46)
Balance at December 31, 2021	$	100	$	35	$	(45)

Components of net periodic pension cost for the Registrants were as follows:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2021
Service cost	$	434	$	102	$	112	$	18	$	10	$	37
Interest cost	346		82		104		16		5		24
Expected return on plan assets	(1,191)		(287)		(375)		(55)		(14)		(86)
Recognized net loss	314		82		100		15		3		13
Net amortization	1		1		1		—		—		15
Prior service cost	—		—		—		—		—		(3)
Net periodic pension cost (income)	$	(96)	$	(20)	$	(58)	$	(6)	$	4	$	—
2020
Service cost	$	376	$	89	$	96	$	15	$	8	$	33
Interest cost	432		100		133		20		6		31
Expected return on plan assets	(1,100)		(264)		(347)		(51)		(13)		(75)
Recognized net loss	269		71		86		13		2		6
Net amortization	1		1		1		—		—		15
Prior service cost	—		—		—		—		—		(3)
Net periodic pension cost (income)	$	(22)	$	(3)	$	(31)	$	(3)	$	3	$	7
2019
Service cost	$	292	$	69	$	74	$	12	$	7	$	25
Interest cost	492		114		156		22		5		36
Expected return on plan assets	(885)		(206)		(292)		(40)		(10)		(60)
Recognized net loss	120		37		44		6		1		2
Net amortization	2		—		1		—		—		14
Prior service cost	—		—		—		—		—		(3)
Net periodic pension cost (income)	$	21	$	14	$	(17)	$	—	$	3	$	14

The service cost component of net periodic pension cost is included in operations and maintenance expenses and all other components of net periodic pension cost are included in other income (expense), net in the Registrants' statements of income.

Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Registrants have elected to amortize changes in the market value of return-seeking plan assets over five years and to recognize the changes in the market value of liability-hedging plan assets immediately. Given the significant concentration in return-seeking plan assets, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.

Effective January 1, 2020, Southern Company changed its method of calculating the market-related value of the liability-hedging securities included in its pension plan assets. The market-related value is used to determine the expected return on plan assets component of net periodic pension cost. Southern Company previously used the calculated value approach for all plan assets, which smoothed asset returns and deferred gains and losses by amortizing them into the calculation of the market-related value over five years. Southern Company changed to the fair value approach for liability-hedging securities, which includes measuring the market-related value of that portion of the plan assets at fair value for purposes of determining the expected return on plan assets. The remaining asset classes of plan assets continue to be valued using the calculated value approach. Southern Company considers the fair value approach to be preferable for liability-hedging securities because it results in a current reflection of changes in the value of plan assets in the measurement of net periodic pension cost more consistent with the change in the related obligations.

Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2021, estimated benefit payments were as follows:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Benefit Payments:
2022	$	690	$	148	$	223	$	31	$	6	$	65
2023	714		155		229		31		6		65
2024	736		159		235		32		6		64
2025	759		165		240		34		7		64
2026	780		171		245		35		7		64
2027 to 2031	4,138		921		1,275		187		42		329

Other Postretirement Benefits

Changes in the APBO and the fair value of the Registrants' plan assets during the plan years ended December 31, 2021 and 2020 were as follows:

	2021
	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	1,948	$	463	$	699	$	81	$	12	$	248
Service cost	24		6		7		1		—		2
Interest cost	35		9		12		1		—		4
Benefits paid	(105)		(22)		(36)		(5)		—		(18)
Actuarial (gain) loss	(54)		(16)		(26)		(2)		(1)		1
Retiree drug subsidy	1		—		—		—		—		—
Balance at end of year	1,849		440		656		76		11		237
Change in plan assets
Fair value of plan assets at beginning of year	1,158		458		427		27		—		128
Actual return on plan assets	154		55		55		4		—		18
Employer contributions	43		(2)		4		3		—		15
Benefits paid	(104)		(22)		(36)		(5)		—		(18)
Fair value of plan assets at end of year	1,251		489		450		29		—		143
Accrued asset (liability)	$	(598)	$	49	$	(206)	$	(47)	$	(11)	$	(94)

	2020
	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Change in benefit obligation
Benefit obligation at beginning of year	$	1,985	$	462	$	742	$	87	$	11	$	250
Service cost	22		6		6		1		1		2
Interest cost	54		13		20		2		—		7
Benefits paid	(126)		(29)		(46)		(6)		—		(17)
Actuarial (gain) loss	7		9		(26)		(3)		—		6
Retiree drug subsidy	6		2		3		—		—		—
Balance at end of year	1,948		463		699		81		12		248
Change in plan assets
Fair value of plan assets at beginning of year	1,061		413		403		26		—		115
Actual return on plan assets	145		60		50		3		—		18
Employer contributions	72		12		17		4		—		12
Benefits paid	(120)		(27)		(43)		(6)		—		(17)
Fair value of plan assets at end of year	1,158		458		427		27		—		128
Accrued liability	$	(790)	$	(5)	$	(272)	$	(54)	$	(12)	$	(120)

Amounts recognized in the balance sheets at December 31, 2021 and 2020 related to the Registrants' other postretirement benefit plans consist of the following:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
December 31, 2021:
Prepaid other postretirement benefit costs(a)	$	—	$	49	$	—	$	—	$	—	$	—
Other regulatory assets, deferred(b)	97		—		30		2		—		—
Other current liabilities	(5)		—		—		—		—		—
Employee benefit obligations(c)	(593)		—		(206)		(47)		(11)		(94)
Other regulatory liabilities, deferred	(171)		(62)		(40)		(1)		—		(34)
AOCI	—		—		—		—		2		(5)
December 31, 2020:
Other regulatory assets, deferred(b)	$	137	$	—	$	47	$	5	$	—	$	(23)
Other current liabilities	(5)		—		—		—		—		—
Employee benefit obligations(c)	(785)		(5)		(272)		(54)		(12)		(120)
Other regulatory liabilities, deferred	(86)		(21)		—		—		—		—
AOCI	8		—		—		—		3		—

(a)Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet.

(b)Amounts for Southern Company exclude regulatory assets of $40 million and $47 million at December 31, 2021 and 2020, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.

(c)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.

Presented below are the amounts included in net regulatory assets (liabilities) at December 31, 2021 and 2020 related to the other postretirement benefit plans of Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost.

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Company Gas
	(in millions)
Balance at December 31, 2021:
Regulatory assets (liabilities):
Prior service cost	$	13	$	3	$	5	$	1	$	1
Net gain	(87)		(65)		(15)		—		(51)
Regulatory amortization	—		—		—		—		16
Total regulatory assets (liabilities)(*)	$	(74)	$	(62)	$	(10)	$	1	$	(34)
Balance at December 31, 2020:
Regulatory assets (liabilities):
Prior service cost	$	12	$	3	$	5	$	—	$	1
Net (gain) loss	39		(24)		42		5		(49)
Regulatory amortization	—		—		—		—		25
Total regulatory assets (liabilities)(*)	$	51	$	(21)	$	47	$	5	$	(23)

(*)Amounts for Southern Company exclude regulatory assets of $40 million and $47 million at December 31, 2021 and 2020, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.

The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2021 and 2020 are presented in the following table:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Company Gas
	(in millions)
Net regulatory assets (liabilities):(*)
Balance at December 31, 2019	$	121	$	1	$	96	$	10	$	(11)
Net gain	(65)		(22)		(47)		(5)		(5)
Reclassification adjustments:
Amortization of prior service costs	1		—		1		—		—
Amortization of net loss	(6)		—		(3)		—		—
Amortization of regulatory assets(*)	—		—		—		—		(7)
Total reclassification adjustments	(5)		—		(2)		—		(7)
Total change	(70)		(22)		(49)		(5)		(12)
Balance at December 31, 2020	$	51	$	(21)	$	47	$	5	$	(23)
Net gain	(120)		(41)		(55)		(4)		(2)
Reclassification adjustments:
Amortization of prior service costs	1		—		1		—		—
Amortization of net loss	(6)		—		(3)		—		—
Amortization of regulatory assets(*)	—		—		—		—		(9)
Total reclassification adjustments	(5)		—		(2)		—		(9)
Total change	(125)		(41)		(57)		(4)		(11)
Balance at December 31, 2021	$	(74)	$	(62)	$	(10)	$	1	$	(34)

(*)Amounts for Southern Company exclude regulatory assets of $40 million and $47 million at December 31, 2021 and 2020, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.

Presented below are the amounts included in AOCI at December 31, 2021 and 2020 related to the other postretirement benefit plans of Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost.

	Southern Company		Southern Power		Southern Company Gas
	(in millions)
Balance at December 31, 2021
AOCI:
Prior service cost	$	1	$	—	$	1
Net (gain) loss	(1)		2		(6)
Total AOCI	$	—	$	2	$	(5)
Balance at December 31, 2020
AOCI:
Prior service cost	$	1	$	—	$	1
Net (gain) loss	7		3		(1)
Total AOCI	$	8	$	3	$	—

The components of OCI related to the other postretirement benefit plans for the plan years ended December 31, 2021 and 2020 are presented in the following table:

	Southern Company		Southern Power		Southern Company Gas
	(in millions)
AOCI:
Balance at December 31, 2019	$	2	$	2	$	(4)
Net loss	2		1		—
Reclassification adjustments:
Amortization of net gain (loss)	4		—		4
Total change	6		1		4
Balance at December 31, 2020	$	8	$	3	$	—
Net gain	(11)		(1)		—
Reclassification adjustments:
Amortization of net gain (loss)	3		—		(5)
Total change	(8)		(1)		(5)
Balance at December 31, 2021	$	—	$	2	$	(5)

Components of the other postretirement benefit plans' net periodic cost for the Registrants were as follows:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2021
Service cost	$	24	$	6	$	7	$	1	$	—	$	2
Interest cost	35		9		12		1		—		4
Expected return on plan assets	(76)		(30)		(26)		(1)		1		(10)
Net amortization	2		—		2		—		—		6
Net periodic postretirement benefit cost (income)	$	(15)	$	(15)	$	(5)	$	1	$	1	$	2
2020
Service cost	$	22	$	6	$	6	$	1	$	1	$	2
Interest cost	54		13		20		2		—		7
Expected return on plan assets	(72)		(29)		(26)		(1)		—		(10)
Net amortization	1		—		2		—		—		6
Net periodic postretirement benefit cost (income)	$	5	$	(10)	$	2	$	2	$	1	$	5
2019
Service cost	$	18	$	5	$	5	$	1	$	1	$	1
Interest cost	69		16		26		3		—		9
Expected return on plan assets	(65)		(26)		(25)		(2)		—		(7)
Net amortization	—		4		1		—		—		6
Net periodic postretirement benefit cost (income)	$	22	$	(1)	$	7	$	2	$	1	$	9

The service cost component of net periodic postretirement benefit cost is included in operations and maintenance expenses and all other components of net periodic postretirement benefit cost are included in other income (expense), net in the Registrants' statements of income.

The Registrants' future benefit payments, including prescription drug benefits, are provided in the table below. These amounts reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans.

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
Benefit payments:
2022	$	111	$	24	$	40	$	5	$	—	$	17
2023	110		24		39		5		—		17
2024	109		24		38		5		—		18
2025	112		25		40		5		1		17
2026	112		25		40		5		1		17
2027 to 2031	552		128		199		22		3		75

Benefit Plan Assets

Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code. The Registrants' investment policies for both the pension plans and the other postretirement benefit plans cover a diversified mix of assets as described below. Derivative instruments may be used to gain efficient exposure to the various asset classes and as hedging tools. Additionally, the Registrants minimize the risk of large losses primarily through diversification but also monitor and manage other aspects of risk.

The investment strategy for plan assets related to the Southern Company system's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Southern Company system employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.

Southern Company's investment strategy also includes adjusting the established asset allocation to invest a larger portion of the portfolio in fixed rate debt securities should the qualified pension plan achieve a predetermined funding threshold. Any future reallocation of plan assets based on achieving the funding threshold would likely result in a reduction in the expected long-term return on plan assets used to determine pension income. However, the amount of such a decrease and the related financial statement impact cannot be determined at this time.

Investment Strategies and Benefit Plan Asset Fair Values

A description of the major asset classes that the pension and other postretirement benefit plans are comprised of, along with the valuation methods used for fair value measurement, is provided below:

Description	Valuation Methodology
Domestic equity: A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches. International equity: A mix of large and small capitalization growth and value stocks with developed and emerging markets exposure, managed both actively and through fundamental indexing approaches.	Domestic and international equities such as common stocks, American depositary receipts, and real estate investment trusts that trade on public exchanges are classified as Level 1 investments and are valued at the closing price in the active market. Equity funds with unpublished prices that are comprised of publicly traded securities (such as commingled/pooled funds) are also valued at the closing price in the active market, but are classified as Level 2.
Fixed income: A mix of domestic and international bonds.	Investments in fixed income securities, including fixed income pooled funds, are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Trust-owned life insurance (TOLI): Investments of taxable trusts aimed at minimizing the impact of taxes on the portfolio.	Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate accounts. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities.
Special situations: Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies, as well as investments in promising new strategies of a longer-term nature. Real estate: Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities. Private equity: Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.	Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.

For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate. The fair values presented herein exclude cash, receivables related to investment income and pending investment sales, and payables related to pending investment purchases. The Registrants did not have any investments classified as Level 3 at December 31, 2020.

The fair values, and actual allocations relative to the target allocations, of the Southern Company system's pension plans at December 31, 2021 and 2020 are presented below.

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2021:	(Level 1)		(Level 2)		(Level 3)		(NAV)		Total
	(in millions)
Southern Company
Assets:
Equity:											51	%	53	%
Domestic equity	$	3,095	$	1,326	$	—	$	—	$	4,421
International equity	2,740		1,402		3		—		4,145
Fixed income:											23		22
U.S. Treasury, government, and agency bonds	—		1,209		—		—		1,209
Mortgage- and asset-backed securities	—		10		—		—		10
Corporate bonds	—		1,752		—		—		1,752
Pooled funds	—		771		—		—		771
Cash equivalents and other	405		7		—		—		412
Real estate investments	706		—		—		2,038		2,744		14		15
Special situations	—		—		—		171		171		3		1
Private equity	—		—		—		1,590		1,590		9		9
Total	$	6,946	$	6,477	$	3	$	3,799	$	17,225	100	%	100	%
Alabama Power
Assets:
Equity:											51	%	53	%
Domestic equity	$	743	$	319	$	—	$	—	$	1,062
International equity	659		337		1		—		997
Fixed income:											23		22
U.S. Treasury, government, and agency bonds	—		291		—		—		291
Mortgage- and asset-backed securities	—		2		—		—		2
Corporate bonds	—		421		—		—		421
Pooled funds	—		186		—		—		186
Cash equivalents and other	97		2		—		—		99
Real estate investments	170		—		—		490		660		14		15
Special situations	—		—		—		41		41		3		1
Private equity	—		—		—		382		382		9		9
Total	$	1,669	$	1,558	$	1	$	913	$	4,141	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2021:	(Level 1)		(Level 2)		(Level 3)		(NAV)		Total
	(in millions)
Georgia Power
Assets:
Equity:											51	%	53	%
Domestic equity	$	972	$	417	$	—	$	—	$	1,389
International equity	861		441		1		—		1,303
Fixed income:											23		22
U.S. Treasury, government, and agency bonds	—		380		—		—		380
Mortgage- and asset-backed securities	—		3		—		—		3
Corporate bonds	—		551		—		—		551
Pooled funds	—		243		—		—		243
Cash equivalents and other	127		2		—		—		129
Real estate investments	222		—		—		641		863		14		15
Special situations	—		—		—		54		54		3		1
Private equity	—		—		—		500		500		9		9
Total	$	2,182	$	2,037	$	1	$	1,195	$	5,415	100	%	100	%
Mississippi Power
Assets:
Equity:											51	%	53	%
Domestic equity	$	142	$	61	$	—	$	—	$	203
International equity	126		64		—		—		190
Fixed income:											23		22
U.S. Treasury, government, and agency bonds	—		55		—		—		55
Corporate bonds	—		80		—		—		80
Pooled funds	—		35		—		—		35
Cash equivalents and other	18		—		—		—		18
Real estate investments	32		—		—		93		125		14		15
Special situations	—		—		—		8		8		3		1
Private equity	—		—		—		73		73		9		9
Total	$	318	$	295	$	—	$	174	$	787	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2021:	(Level 1)		(Level 2)		(Level 3)		(NAV)		Total
	(in millions)
Southern Power
Assets:
Equity:											51	%	53	%
Domestic equity	$	38	$	16	$	—	$	—	$	54
International equity	34		17		—		—		51
Fixed income:											23		22
U.S. Treasury, government, and agency bonds	—		15		—		—		15
Corporate bonds	—		22		—		—		22
Pooled funds	—		10		—		—		10
Cash equivalents and other	5		—		—		—		5
Real estate investments	9		—		—		25		34		14		15
Special situations	—		—		—		2		2		3		1
Private equity	—		—		—		20		20		9		9
Total	$	86	$	80	$	—	$	47	$	213	100%		100	%
Southern Company Gas
Assets:
Equity:											51	%	53	%
Domestic equity	$	223	$	96	$	—	$	—	$	319
International equity	197		101		—		—		298
Fixed income:											23		22
U.S. Treasury, government, and agency bonds	—		87		—		—		87
Mortgage- and asset-backed securities	—		1		—		—		1
Corporate bonds	—		126		—		—		126
Pooled funds	—		56		—		—		56
Cash equivalents and other	29		—		—		—		29
Real estate investments	51		—		—		147		198		14		15
Special situations	—		—		—		12		12		3		1
Private equity	—		—		—		115		115		9		9
Total	$	500	$	467	$	—	$	274	$	1,241	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2020:	(Level 1)		(Level 2)		(NAV)		Total
	(in millions)
Southern Company
Assets:
Equity:									51	%	56	%
Domestic equity	$	2,852	$	1,247	$	—	$	4,099
International equity	2,660		1,497		—		4,157
Fixed income:									23		23
U.S. Treasury, government, and agency bonds	—		951		—		951
Mortgage- and asset-backed securities	—		9		—		9
Corporate bonds	—		1,673		—		1,673
Pooled funds	—		772		—		772
Cash equivalents and other	356		5		—		361
Real estate investments	542		—		1,596		2,138		14		13
Special situations	—		—		166		166		3		1
Private equity	—		—		1,104		1,104		9		7
Total	$	6,410	$	6,154	$	2,866	$	15,430	100	%	100	%
Alabama Power
Assets:
Equity:									51	%	56	%
Domestic equity	$	685	$	299	$	—	$	984
International equity	638		359		—		997
Fixed income:									23		23
U.S. Treasury, government, and agency bonds	—		228		—		228
Mortgage- and asset-backed securities	—		2		—		2
Corporate bonds	—		401		—		401
Pooled funds	—		185		—		185
Cash equivalents and other	85		1		—		86
Real estate investments	130		—		382		512		14		13
Special situations	—		—		40		40		3		1
Private equity	—		—		264		264		9		7
Total	$	1,538	$	1,475	$	686	$	3,699	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2020:	(Level 1)		(Level 2)		(NAV)		Total
	(in millions)
Georgia Power
Assets:
Equity:									51	%	56	%
Domestic equity	$	899	$	393	$	—	$	1,292
International equity	839		472		—		1,311
Fixed income:									23		23
U.S. Treasury, government, and agency bonds	—		300		—		300
Mortgage- and asset-backed securities	—		3		—		3
Corporate bonds	—		527		—		527
Pooled funds	—		243		—		243
Cash equivalents and other	112		1		—		113
Real estate investments	171		—		503		674		14		13
Special situations	—		—		53		53		3		1
Private equity	—		—		348		348		9		7
Total	$	2,021	$	1,939	$	904	$	4,864	100	%	100	%
Mississippi Power
Assets:
Equity:									51	%	56	%
Domestic equity	$	131	$	57	$	—	$	188
International equity	122		68		—		190
Fixed income:									23		23
U.S. Treasury, government, and agency bonds	—		43		—		43
Corporate bonds	—		76		—		76
Pooled funds	—		35		—		35
Cash equivalents and other	16		—		—		16
Real estate investments	25		—		73		98		14		13
Special situations	—		—		8		8		3		1
Private equity	—		—		50		50		9		7
Total	$	294	$	279	$	131	$	704	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2020:	(Level 1)		(Level 2)		(NAV)		Total
	(in millions)
Southern Power
Assets:
Equity:									51	%	56	%
Domestic equity	$	35	$	15	$	—	$	50
International equity	32		19		—		51
Fixed income:									23		23
U.S. Treasury, government, and agency bonds	—		12		—		12
Corporate bonds	—		20		—		20
Pooled funds	—		9		—		9
Cash equivalents and other	4		—		—		4
Real estate investments	7		—		19		26		14		13
Special situations	—		—		2		2		3		1
Private equity	—		—		13		13		9		7
Total	$	78	$	75	$	34	$	187	100	%	100	%
Southern Company Gas
Assets:
Equity:									51	%	56	%
Domestic equity	$	209	$	91	$	—	$	300
International equity	195		109		—		304
Fixed income:									23		23
U.S. Treasury, government, and agency bonds	—		69		—		69
Mortgage- and asset-backed securities	—		1		—		1
Corporate bonds	—		122		—		122
Pooled funds	—		56		—		56
Cash equivalents and other	26		—		—		26
Real estate investments	40		—		117		157		14		13
Special situations	—		—		12		12		3		1
Private equity	—		—		81		81		9		7
Total	$	470	$	448	$	210	$	1,128	100	%	100	%

The fair values, and actual allocations relative to the target allocations, of the applicable Registrants' other postretirement benefit plan assets at December 31, 2021 and 2020 are presented below.

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient		Total		Target Allocation		Actual Allocation
At December 31, 2021:	(Level 1)		(Level 2)		(NAV)
	(in millions)
Southern Company
Assets:
Equity:									64	%	66	%
Domestic equity	$	123	$	112	$	—	$	235
International equity	73		99		—		172
Fixed income:									27		25
U.S. Treasury, government, and agency bonds	—		37		—		37
Corporate bonds	—		50		—		50
Pooled funds	—		90		—		90
Cash equivalents and other	14		—		—		14
Trust-owned life insurance	—		530		—		530
Real estate investments	20		—		54		74		5		6
Special situations	—		—		5		5		1		—
Private equity	—		—		42		42		3		3
Total	$	230	$	918	$	101	$	1,249	100	%	100	%
Alabama Power
Assets:
Equity:									71	%	69	%
Domestic equity	$	26	$	11	$	—	$	37
International equity	23		12		—		35
Fixed income:									21		21
U.S. Treasury, government, and agency bonds	—		10		—		10
Corporate bonds	—		18		—		18
Pooled funds	—		6		—		6
Cash equivalents and other	3		—		—		3
Trust-owned life insurance	—		341		—		341
Real estate investments	6		—		17		23		4		7
Special situations	—		—		2		2		1		—
Private equity	—		—		13		13		3		3
Total	$	58	$	398	$	32	$	488	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient		Total		Target Allocation		Actual Allocation
At December 31, 2021:	(Level 1)		(Level 2)		(NAV)
	(in millions)
Georgia Power
Assets:
Equity:									60	%	62	%
Domestic equity	$	65	$	13	$	—	$	78
International equity	22		50		—		72
Fixed income:									33		30
U.S. Treasury, government, and agency bonds	—		9		—		9
Corporate bonds	—		14		—		14
Pooled funds	—		46		—		46
Cash equivalents and other	5		—		—		5
Trust-owned life insurance	—		189		—		189
Real estate investments	7		—		16		23		4		5
Special situations	—		—		1		1		1		—
Private equity	—		—		13		13		2		3
Total	$	99	$	321	$	30	$	450	100	%	100	%
Mississippi Power
Assets:
Equity:									43	%	44	%
Domestic equity	$	4	$	2	$	—	$	6
International equity	4		2		—		6
Fixed income:									36		34
U.S. Treasury, government, and agency bonds	—		5		—		5
Corporate bonds	—		2		—		2
Pooled funds	—		1		—		1
Cash equivalents and other	1		—		—		1
Real estate investments	1		—		3		4		11		13
Special situations	—		—		—		—		2		1
Private equity	—		—		2		2		8		8
Total	$	10	$	12	$	5	$	27	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient		Total		Target Allocation		Actual Allocation
At December 31, 2021:	(Level 1)		(Level 2)		(NAV)
	(in millions)
Southern Company Gas
Assets:
Equity:									72	%	73	%
Domestic equity	$	3	$	76	$	—	$	79
International equity	2		24		—		26
Fixed income:									26		24
U.S. Treasury, government, and agency bonds	—		1		—		1
Corporate bonds	—		1		—		1
Pooled funds	—		30		—		30
Cash equivalents and other	2		—		—		2
Real estate investments	1		—		2		3		1		2
Private equity	—		—		1		1		1		1
Total	$	8	$	132	$	3	$	143	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2020:	(Level 1)		(Level 2)		(NAV)		Total
	(in millions)
Southern Company
Assets:
Equity:									63	%	66	%
Domestic equity	$	113	$	98	$	—	$	211
International equity	71		102		—		173
Fixed income:									28		27
U.S. Treasury, government, and agency bonds	—		32		—		32
Corporate bonds	—		44		—		44
Pooled funds	—		86		—		86
Cash equivalents and other	15		—		—		15
Trust-owned life insurance	—		508		—		508
Real estate investments	15		—		42		57		5		5
Special situations	—		—		4		4		1		—
Private equity	—		—		29		29		3		2
Total	$	214	$	870	$	75	$	1,159	100	%	100	%
Alabama Power
Assets:
Equity:									68	%	69	%
Domestic equity	$	26	$	11	$	—	$	37
International equity	23		13		—		36
Fixed income:									24		25
U.S. Treasury, government, and agency bonds	—		11		—		11
Corporate bonds	—		14		—		14
Pooled funds	—		7		—		7
Cash equivalents and other	5		—		—		5
Trust-owned life insurance	—		321		—		321
Real estate investments	5		—		13		18		4		4
Special situations	—		—		1		1		1		—
Private equity	—		—		9		9		3		2
Total	$	59	$	377	$	23	$	459	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2020:	(Level 1)		(Level 2)		(NAV)		Total
	(in millions)
Georgia Power
Assets:
Equity:									60	%	64	%
Domestic equity	$	58	$	10	$	—	$	68
International equity	21		50		—		71
Fixed income:									33		30
U.S. Treasury, government, and agency bonds	—		8		—		8
Corporate bonds	—		13		—		13
Pooled funds	—		46		—		46
Cash equivalents and other	5		—		—		5
Trust-owned life insurance	—		188		—		188
Real estate investments	5		—		13		18		4		4
Special situations	—		—		1		1		1		—
Private equity	—		—		9		9		2		2
Total	$	89	$	315	$	23	$	427	100	%	100	%
Mississippi Power
Assets:
Equity:									43	%	46	%
Domestic equity	$	4	$	2	$	—	$	6
International equity	4		2		—		6
Fixed income:									37		36
U.S. Treasury, government, and agency bonds	—		5		—		5
Corporate bonds	—		2		—		2
Pooled funds	—		1		—		1
Cash equivalents and other	1		—		—		1
Real estate investments	1		—		2		3		11		11
Special situations	—		—		—		—		2		1
Private equity	—		—		2		2		7		6
Total	$	10	$	12	$	4	$	26	100	%	100	%

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Net Asset Value as a Practical Expedient				Target Allocation		Actual Allocation
At December 31, 2020:	(Level 1)		(Level 2)		(NAV)		Total
	(in millions)
Southern Company Gas
Assets:
Equity:									72	%	76	%
Domestic equity	$	2	$	66	$	—	$	68
International equity	2		25		—		27
Fixed income:									26		22
U.S. Treasury, government, and agency bonds	—		1		—		1
Corporate bonds	—		1		—		1
Pooled funds	—		25		—		25
Cash equivalents and other	1		—		—		1
Real estate investments	—		—		1		1		1		1
Private equity	—		—		1		1		1		1
Total	$	5	$	118	$	2	$	125	100	%	100	%

Employee Savings Plan

Southern Company and its subsidiaries also sponsor 401(k) defined contribution plans covering substantially all employees and provide matching contributions up to specified percentages of an employee's eligible pay. Total matching contributions made to the plans for 2021, 2020, and 2019 were as follows:

	Southern Company		Alabama Power		Georgia Power		Mississippi Power		Southern Power		Southern Company Gas
	(in millions)
2021	$	119	$	26	$	28	$	5	$	2	$	16
2020	120		26		29		5		2		16
2019	113		25		27		4		2		15