Consolidated Statements of Capitalization - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Maturity
2020	$ 2,991
2021	3,214
2022	2,003
2023	2,413
2024	492
Total long-term senior notes and debt	30,377	$ 34,025
Pollution control revenue bonds —
Total other long-term debt	13,947	10,684
Unamortized fair value adjustment of long-term debt	430	474
Finance lease obligations	226
Finance lease obligations		197
Unamortized debt premium (discount), net	(152)	(158)
Unamortized debt issuance expense	(247)	(208)
Total long-term debt	44,787	45,220
Amount due within one year	2,989	3,198
Amount held for sale	0	1,286
Long-term debt excluding amounts due within one year and held for sale	$ 41,798	$ 40,736
Percent capitalization	56.60%	58.10%
Cumulative preferred stock
Redeemable preferred stock	$ 291	$ 291
Total redeemable preferred stock - percent capitalization	0.40%	0.40%
Common Stockholders' Equity:
Common stock	$ 5,257	$ 5,164
Paid-in capital	11,734	11,094
Treasury, at cost	(42)	(38)
Retained earnings	10,877	8,706
Accumulated other comprehensive loss	(321)	(203)
Total common stockholders' equity	$ 27,505	$ 24,723
Total common stockholders' equity - percent capitalization	37.20%	35.30%
Total preferred and preference stock of subsidiaries - percent capitalization	5.80%	6.20%
Total Stockholders' Equity	$ 31,759	$ 29,039
Total Capitalization	$ 73,848	$ 70,066
Percent capitalization	100.00%	100.00%
Redeemable Preferred Stock, $100 par or stated value \| Cumulative preferred stock
Cumulative preferred stock
Redeemable preferred stock	$ 48	$ 48
Redeemable Preferred Stock, $1 par value \| Cumulative preferred stock
Cumulative preferred stock
Redeemable preferred stock	243	243
Noncontrolling interests
Common Stockholders' Equity:
Total preferred and preference stock of subsidiaries and noncontrolling interests	$ 4,254	4,316
Long-term debt payable to affiliated trusts — variable rate due 2042
Weighted average interest rate	5.20%
Long-Term Debt:
Long-term debt payable to affiliated trusts, variable rate due 2042	$ 206	206
Long-term senior notes and debt matured in 2019 \| Senior Notes
Maturity
2019	$ 0	2,948
Long-term senior notes and debt maturing 2020 \| Senior Notes
Weighted average interest rate	2.43%
Maturity
2020	$ 2,100	2,271
Long-term senior notes and debt maturing 2021 \| Senior Notes
Weighted average interest rate	2.70%
Maturity
2021	$ 2,672	2,638
Long-term senior notes and debt maturing 2021 \| Adjustable Rate Loans
Weighted average interest rate	2.50%
Maturity
2020	$ 800	1,875
Long-term senior notes and debt maturing 2022 \| Senior Notes
Weighted average interest rate	2.53%
Maturity
2022	$ 1,870	1,983
Long-term senior notes and debt maturing 2022 \| Adjustable Rate Loans
Weighted average interest rate	2.42%
Maturity
2021	$ 125	125
Long-term senior notes and debt maturing 2023 \| Senior Notes
Weighted average interest rate	3.05%
Maturity
2023	$ 2,290	2,290
Long-term senior notes and debt maturing 2024 \| Senior Notes
Weighted average interest rate	2.20%
Maturity
2024	$ 400	0
Long-term senior notes and debt maturing 2025-2049 \| Senior Notes
Weighted average interest rate	4.27%
Maturity
thereafter	$ 20,120	19,895
Pollution control revenue bonds due 2019
Pollution control revenue bonds —
Pollution control revenue bonds	$ 0	25
Pollution control revenue bonds due 2022
Weighted average interest rate	2.35%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 53	90
Pollution control revenue bonds due 2023
Pollution control revenue bonds —
Pollution control revenue bonds	$ 0	33
Pollution control revenue bonds due 2025 through 2053
Weighted average interest rate	2.40%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 1,466	1,112
Pollution control revenue bonds - variable rates due 2020
Weighted average interest rate	1.80%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 7	148
Pollution control revenue bonds - variable rates due 2021
Weighted average interest rate	1.75%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 65	65
Pollution control revenue bonds - variable rates due 2022
Pollution control revenue bonds —
Pollution control revenue bonds	$ 0	4
Pollution control revenue bonds - variable rates due 2024
Weighted average interest rate	1.72%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 21	21
Pollution control revenue bonds - variable rates due 2025-2052
Weighted average interest rate	1.69%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 1,351	1,396
Plant Daniel revenue bonds due 2021
Weighted average interest rate	7.13%
Pollution control revenue bonds —
Plant Daniel revenue bonds due 2021	$ 270	270
FFB loans — due 2020
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
FFB loans — due 2021
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
FFB loans — due 2022
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
FFB loans — due 2023
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
FFB loans — due 2024
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
FFB loans — due 2025-2044
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 3,523	2,405
First mortgage bonds — due 2019
Pollution control revenue bonds —
First mortgage bonds	$ 0	50
First mortgage bonds — due 2023
Weighted average interest rate	5.80%
Pollution control revenue bonds —
First mortgage bonds	$ 50	50
First mortgage bonds — due 2026-2059
Weighted average interest rate	3.94%
Pollution control revenue bonds —
First mortgage bonds	$ 1,525	1,225
Junior subordinated notes due 2024 \| Junior Subordinated Debt
Weighted average interest rate	2.70%
Pollution control revenue bonds —
Junior subordinated notes	$ 863	0
Junior subordinated notes due 2027 to 2077 \| Junior Subordinated Debt
Weighted average interest rate	5.00%
Pollution control revenue bonds —
Junior subordinated notes	$ 4,433	3,570
Alabama Power
Maturity
2020	251
2021	311
2022	751
2023	301
2024	22
Total long-term notes payable	7,320	6,920
Pollution control revenue bonds —
Total other long-term debt	1,060	1,060
Finance lease obligations	4
Finance lease obligations		4
Unamortized debt premium (discount), net	(14)	(12)
Unamortized debt issuance expense	(55)	(54)
Total long-term debt	8,521	8,124
Amount due within one year	251	201
Long-term debt excluding amounts due within one year and held for sale	$ 8,270	$ 7,923
Percent capitalization	47.20%	50.40%
Cumulative preferred stock
Redeemable preferred stock	$ 291	$ 291
Total redeemable preferred stock - percent capitalization	1.70%	1.90%
Common Stockholders' Equity:
Common stock	$ 1,222	$ 1,222
Paid-in capital	4,755	3,508
Retained earnings	3,001	2,775
Accumulated other comprehensive loss	(23)	(28)
Total common stockholders' equity	$ 8,955	$ 7,477
Total common stockholders' equity - percent capitalization	51.10%	47.70%
Total Stockholders' Equity	$ 8,955	$ 7,477
Total Capitalization	$ 17,516	$ 15,691
Percent capitalization	100.00%	100.00%
Alabama Power \| Redeemable Preferred Stock, $100 par or stated value \| Cumulative preferred stock
Cumulative preferred stock
Redeemable preferred stock	$ 48	$ 48
Alabama Power \| Redeemable Preferred Stock, $1 par value \| Cumulative preferred stock
Cumulative preferred stock
Redeemable preferred stock	$ 243	243
Alabama Power \| Long-term debt payable to affiliated trusts — variable rate due 2042
Weighted average interest rate	5.20%
Long-Term Debt:
Long-term debt payable to affiliated trusts, variable rate due 2042	$ 206	206
Alabama Power \| Long-term senior notes and debt matured in 2019 \| Senior Notes
Maturity
2019	$ 0	200
Alabama Power \| Long-term senior notes and debt maturing 2020 \| Senior Notes
Weighted average interest rate	3.38%
Maturity
2020	$ 250	250
Alabama Power \| Long-term senior notes and debt maturing 2021 \| Senior Notes
Weighted average interest rate	3.81%
Maturity
2021	$ 220	220
Alabama Power \| Long-term senior notes and debt maturing 2022 \| Senior Notes
Weighted average interest rate	3.36%
Maturity
2022	$ 750	750
Alabama Power \| Long-term senior notes and debt maturing 2023 \| Senior Notes
Weighted average interest rate	3.55%
Maturity
2023	$ 300	300
Alabama Power \| Long-term senior notes and debt maturing 2025-2049 \| Senior Notes
Weighted average interest rate	4.41%
Maturity
thereafter	$ 5,775	5,175
Alabama Power \| Long-term senior notes and debt, variable rate due 2021 \| Adjustable Rate Loans
Weighted average interest rate	2.90%
Maturity
2021	$ 25	25
Alabama Power \| Pollution control revenue bonds due 2034
Weighted average interest rate	2.46%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 207	207
Alabama Power \| Pollution control revenue bonds - variable rates due 2021
Weighted average interest rate	1.75%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 65	65
Alabama Power \| Pollution control revenue bonds - variable rates due 2024
Weighted average interest rate	1.72%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 21	21
Alabama Power \| Pollution control revenue bonds - variable rates due 2028-2038
Weighted average interest rate	1.65%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 767	767
Georgia Power
Maturity
2020	1,025
2021	397
2022	527
2023	175
2024	477
Total long-term notes payable	5,850	5,598
Pollution control revenue bonds —
Total other long-term debt	5,934	4,355
Finance lease obligations	156
Finance lease obligations		142
Unamortized debt premium (discount), net	(7)	(6)
Unamortized debt issuance expense	(117)	(108)
Total long-term debt	11,816	9,981
Amount due within one year	1,025	617
Long-term debt excluding amounts due within one year and held for sale	$ 10,791	$ 9,364
Percent capitalization	41.70%	39.50%
Common Stockholders' Equity:
Common stock	$ 398	$ 398
Paid-in capital	10,962	10,322
Retained earnings	3,756	3,612
Accumulated other comprehensive loss	(51)	(9)
Total common stockholders' equity	$ 15,065	$ 14,323
Total common stockholders' equity - percent capitalization	58.30%	60.50%
Total Stockholders' Equity	$ 15,065	$ 14,323
Total Capitalization	$ 25,856	$ 23,687
Percent capitalization	100.00%	100.00%
Georgia Power \| Long-term senior notes and debt matured in 2019
Maturity
2019	$ 0	$ 498
Georgia Power \| Long-term senior notes and debt maturing 2020 \| Senior Notes
Weighted average interest rate	2.00%
Maturity
2020	$ 950	950
Georgia Power \| Long-term senior notes and debt maturing 2021 \| Senior Notes
Weighted average interest rate	2.40%
Maturity
2021	$ 325	325
Georgia Power \| Long-term senior notes and debt maturing 2022 \| Senior Notes
Weighted average interest rate	2.85%
Maturity
2022	$ 400	400
Georgia Power \| Long-term senior notes and debt maturing 2023 \| Senior Notes
Weighted average interest rate	5.75%
Maturity
2023	$ 100	100
Georgia Power \| Long-term senior notes and debt maturing 2024 \| Senior Notes
Weighted average interest rate	2.20%
Maturity
2024	$ 400	0
Georgia Power \| Long-term senior notes and debt maturing 2026-2043 \| Senior Notes
Weighted average interest rate	4.21%
Maturity
thereafter	$ 3,675	3,325
Georgia Power \| Pollution control revenue bonds due 2022
Weighted average interest rate	2.35%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 53	53
Georgia Power \| Pollution control revenue bonds due 2025 through 2053
Weighted average interest rate	2.37%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 1,217	748
Georgia Power \| Pollution control revenue bonds - variable rates due 2019
Pollution control revenue bonds —
Pollution control revenue bonds	$ 0	108
Georgia Power \| Pollution control revenue bonds - variable rates due 2026-2052
Weighted average interest rate	1.74%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 551	551
Georgia Power \| FFB loans — due 2020
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
Georgia Power \| FFB loans — due 2021
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
Georgia Power \| FFB loans — due 2022
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
Georgia Power \| FFB loans — due 2023
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
Georgia Power \| FFB loans — due 2024
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 64	44
Georgia Power \| FFB loans — due 2025-2044
Weighted average interest rate	3.20%
Pollution control revenue bonds —
FFB loans	$ 3,523	2,405
Georgia Power \| Junior subordinated notes due 2077 \| Junior Subordinated Debt
Weighted average interest rate	5.00%
Pollution control revenue bonds —
Junior subordinated notes	$ 270	270
Mississippi Power
Maturity
2020	281
2021	270
2022	0
2023	0
2024	0
Total long-term notes payable	1,225	1,250
Pollution control revenue bonds —
Total other long-term debt	353	310
Finance lease obligations	0
Unamortized debt premium (discount), net	19	27
Unamortized debt issuance expense	(8)	(8)
Total long-term debt	1,589	1,579
Amount due within one year	281	40
Long-term debt excluding amounts due within one year and held for sale	$ 1,308	$ 1,539
Percent capitalization	44.20%	48.90%
Common Stockholders' Equity:
Common stock	$ 38	$ 38
Paid-in capital	4,449	4,546
Retained earnings	(2,832)	(2,971)
Accumulated other comprehensive loss	(3)	(4)
Total common stockholders' equity	$ 1,652	$ 1,609
Total common stockholders' equity - percent capitalization	55.80%	51.10%
Total Stockholders' Equity	$ 1,652	$ 1,609
Total Capitalization	$ 2,960	$ 3,148
Percent capitalization	100.00%	100.00%
Mississippi Power \| Long-term debt payable to affiliated trusts — variable rate due 2028-2042 \| Senior Notes
Weighted average interest rate	4.16%
Maturity
thereafter	$ 950	$ 950
Mississippi Power \| Long-term senior notes and debt maturing 2020 \| Adjustable Rate Loans
Weighted average interest rate	2.59%
Maturity
2020	$ 275	300
Mississippi Power \| Pollution control revenue bonds due 2028
Weighted average interest rate	3.20%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 43	0
Mississippi Power \| Pollution control revenue bonds - variable rates due 2020
Weighted average interest rate	1.80%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 7	40
Mississippi Power \| Pollution control revenue bonds - variable rates due 2025-2028
Weighted average interest rate	1.80%
Pollution control revenue bonds —
Pollution control revenue bonds	$ 33	0
Mississippi Power \| Plant Daniel revenue bonds due 2021
Weighted average interest rate	7.13%
Pollution control revenue bonds —
Plant Daniel revenue bonds due 2021	$ 270	270
Southern Company Gas
Maturity
2020	0
2021	330
2022	46
2023	400
2024	0
Total long-term notes payable	3,860	4,160
Pollution control revenue bonds —
Total other long-term debt	1,575	1,325
Unamortized fair value adjustment of long-term debt	430	474
Finance lease obligations	0
Unamortized debt discount	(20)	(19)
Total long-term debt	5,845	5,940
Amount due within one year	0	357
Long-term debt excluding amounts due within one year and held for sale	$ 5,845	$ 5,583
Percent capitalization	38.10%	39.40%
Common Stockholders' Equity:
Paid-in capital	$ 9,697	$ 8,856
Retained earnings	(198)	(312)
Accumulated other comprehensive loss	7	26
Total common stockholders' equity	$ 9,506	$ 8,570
Total common stockholders' equity - percent capitalization	61.90%	60.60%
Total Stockholders' Equity	$ 9,506	$ 8,570
Total Capitalization	$ 15,351	$ 14,153
Percent capitalization	100.00%	100.00%
Southern Company Gas \| Long-term senior notes and debt matured in 2019 \| Senior Notes
Maturity
2019	$ 0	$ 300
Southern Company Gas \| Long-term senior notes and debt maturing 2021 \| Senior Notes
Weighted average interest rate	4.01%
Maturity
2021	$ 330	330
Southern Company Gas \| Long-term senior notes and debt maturing 2022 \| Senior Notes
Weighted average interest rate	8.63%
Maturity
2022	$ 46	46
Southern Company Gas \| Long-term senior notes and debt maturing 2023 \| Senior Notes
Weighted average interest rate	2.45%
Maturity
2023	$ 350	350
Southern Company Gas \| Long-term senior notes and debt maturing 2025-2047 \| Senior Notes
Weighted average interest rate	4.68%
Maturity
thereafter	$ 3,134	3,134
Southern Company Gas \| First mortgage bonds — due 2019
Pollution control revenue bonds —
First mortgage bonds	$ 0	50
Southern Company Gas \| First mortgage bonds — due 2023
Weighted average interest rate	5.80%
Pollution control revenue bonds —
First mortgage bonds	$ 50	50
Southern Company Gas \| First mortgage bonds — due 2026-2059
Weighted average interest rate	3.94%
Pollution control revenue bonds —
First mortgage bonds	$ 1,525	$ 1,225

Capitalization in percent.

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As a percent of total capitalization, the total of all Common Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity. This excludes temporary equity and preferred and preference stockholders' equity.

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First Mortgage Bonds

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Loan For Federal Financing Bank

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Long-Term Debt And Capital Lease Obligations, Held For Sale

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As a percent of total capitalization, the sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

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Amount of long-term debt matured in the past twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Long-term Notes and Other Long-term Debt with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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As a percent of total capitalization, the total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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Taxable Revenue Bonds

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As a percent of total capitalization, the carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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Unamortized Fair Value Adjustment of Long-term Debt

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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