Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 1,975	$ 1,396
Receivables —
Customer accounts receivable	1,614	1,726
Energy marketing receivable	428	801
Unbilled revenues	599	654
Under recovered fuel clause revenues	0	115
Other accounts and notes receivable	817	813
Accumulated provision for uncollectible accounts	(49)	(50)
Materials and supplies	1,388	1,465
Fossil fuel for generation	521	405
Natural gas for sale	479	524
Prepaid expenses	314	432
Regulatory assets – asset retirement obligations	287	0
Assets from risk management activities, net of collateral	183	222
Other regulatory assets	885	525
Assets held for sale	188	393
Other current assets	188	162
Total current assets	9,817	9,583
Property, Plant, and Equipment:
In service	105,114	103,706
Less: Accumulated depreciation	30,765	31,038
Plant in service, net of depreciation	74,349	72,668
Nuclear fuel, at amortized cost	851	875
Construction work in progress	7,880	7,254
Total property, plant, and equipment	83,080	80,797
Other Property and Investments:
Goodwill	5,280	5,315
Equity investments in unconsolidated subsidiaries	1,303	1,580
Other intangible assets, net of amortization	536	613
Nuclear decommissioning trusts, at fair value	2,036	1,721
Leveraged leases	788	798
Miscellaneous property and investments	391	269
Total other property and investments	10,334	10,296
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,800
Deferred charges related to income taxes	798	794
Unamortized loss on reacquired debt	300	323
Regulatory assets – asset retirement obligations, deferred	4,094	2,933
Other regulatory assets, deferred	6,805	5,375
Assets held for sale, deferred	601	5,350
Other deferred charges and assets	1,071	1,463
Total deferred charges and other assets	15,469	16,238
Total Assets	118,700	116,914
Current Liabilities:
Securities due within one year	2,989	3,198
Notes payable	2,055	2,915
Accounts payable —
Energy marketing trade payables	442	856
Accounts payable	2,115	2,580
Customer deposits	496	522
Accrued income taxes	0	21
Other accrued taxes	659	635
Accrued interest	474	472
Accrued compensation	992	1,030
Asset retirement obligations	504	404
Other regulatory liabilities	756	376
Liabilities held for sale	5	425
Operating lease obligations	229
Other current liabilities	830	852
Total current liabilities	12,546	14,286
Long-Term Debt:
Unamortized debt premium (discount), net	152	158
Unamortized debt issuance expense	(247)	(208)
Total long-term debt	41,798	40,736
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	7,888	6,558
Deferred credits related to income taxes	6,078	6,460
Accumulated deferred ITCs	2,291	2,372
Employee benefit obligations	1,814	2,147
Operating lease obligations, deferred	1,615
Asset retirement obligations, deferred	9,282	8,990
Accrued environmental remediation	234	268
Other cost of removal obligations	2,239	2,297
Other regulatory liabilities, deferred	256	169
Liabilities held for sale, deferred	0	2,836
Other deferred credits and liabilities	609	465
Total deferred credits and other liabilities	32,306	32,562
Total Liabilities	86,650	87,584
Common Stockholder's Equity:
Common stock	5,257	5,164
Paid-in capital	11,734	11,094
Retained earnings	10,877	8,706
Accumulated other comprehensive income (loss)	(321)	(203)
Total common stockholders' equity	27,505	24,723
Redeemable Preferred Stock of Subsidiaries	291	291
Total Stockholders' Equity	31,759	29,039
Total Liabilities and Stockholder's Equity	118,700	116,914
Commitments and Contingent Matters
Alabama Power
Current Assets:
Cash and cash equivalents	894	313
Receivables —
Customer accounts receivable	425	403
Unbilled revenues	134	150
Other accounts and notes receivable	72	51
Affiliated	37	94
Accumulated provision for uncollectible accounts	(22)	(10)
Materials and supplies	512	546
Fossil fuel for generation	212	141
Prepaid expenses	50	66
Other regulatory assets	242	137
Other current assets	30	18
Total current assets	2,586	1,909
Property, Plant, and Equipment:
In service	30,023	30,402
Less: Accumulated depreciation	9,540	9,988
Plant in service, net of depreciation	20,483	20,414
Nuclear fuel, at amortized cost	296	324
Construction work in progress	890	1,113
Total property, plant, and equipment	21,669	21,851
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	66	65
Nuclear decommissioning trusts, at fair value	1,023	847
Miscellaneous property and investments	128	127
Total other property and investments	1,217	1,039
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	132
Deferred charges related to income taxes	244	240
Deferred under recovered regulatory clause revenues	40	116
Regulatory assets – asset retirement obligations, deferred	1,019	147
Other regulatory assets, deferred	1,976	1,240
Other deferred charges and assets	269	188
Total deferred charges and other assets	3,680	1,931
Total Assets	29,152	26,730
Current Liabilities:
Securities due within one year	251	201
Accounts payable —
Affiliated	316	364
Other	514	614
Customer deposits	100	96
Accrued income taxes	78	44
Accrued interest	92	89
Accrued compensation	216	227
Asset retirement obligations	195	163
Other regulatory liabilities	193	116
Operating lease obligations	49
Other current liabilities	105	45
Total current liabilities	2,060	1,959
Long-Term Debt:
Unamortized debt premium (discount), net	14	12
Unamortized debt issuance expense	(55)	(54)
Total long-term debt	8,270	7,923
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,260	2,962
Deferred credits related to income taxes	1,960	2,027
Accumulated deferred ITCs	100	106
Employee benefit obligations	206	314
Operating lease obligations, deferred	107
Asset retirement obligations, deferred	3,345	3,047
Other cost of removal obligations	412	497
Other regulatory liabilities, deferred	146	69
Other deferred credits and liabilities	40	58
Total deferred credits and other liabilities	9,576	9,080
Total Liabilities	19,906	18,962
Redeemable Preferred Stock	291	291
Common Stockholder's Equity:
Common stock	1,222	1,222
Paid-in capital	4,755	3,508
Retained earnings	3,001	2,775
Accumulated other comprehensive income (loss)	(23)	(28)
Total common stockholders' equity	8,955	7,477
Redeemable Preferred Stock of Subsidiaries	291	291
Total Stockholders' Equity	8,955	7,477
Total Liabilities and Stockholder's Equity	29,152	26,730
Commitments and Contingent Matters
Georgia Power
Current Assets:
Cash and cash equivalents	52	4
Restricted cash and cash equivalents	0	108
Receivables —
Customer accounts receivable	533	591
Unbilled revenues	203	208
Under recovered fuel clause revenues	0	115
Joint owner accounts receivable	136	170
Other accounts and notes receivable	209	80
Affiliated	21	39
Accumulated provision for uncollectible accounts	(2)	(2)
Materials and supplies	501	519
Fossil fuel for generation	272	231
Prepaid expenses	63	142
Regulatory assets – storm damage reserves	213	30
Regulatory assets – asset retirement obligations	254	0
Other regulatory assets	263	169
Other current assets	77	70
Total current assets	2,795	2,474
Property, Plant, and Equipment:
In service	38,137	37,675
Less: Accumulated depreciation	11,753	12,096
Plant in service, net of depreciation	26,384	25,579
Nuclear fuel, at amortized cost	555	550
Construction work in progress	5,650	4,833
Total property, plant, and equipment	32,589	30,962
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	52	51
Nuclear decommissioning trusts, at fair value	1,013	873
Miscellaneous property and investments	64	72
Total other property and investments	1,129	996
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,428
Deferred charges related to income taxes	519	517
Regulatory assets – asset retirement obligations, deferred	2,865	2,644
Other regulatory assets, deferred	2,716	2,258
Other deferred charges and assets	500	514
Total deferred charges and other assets	8,028	5,933
Total Assets	44,541	40,365
Current Liabilities:
Securities due within one year	1,025	617
Notes payable	365	294
Accounts payable —
Affiliated	512	575
Other	711	890
Customer deposits	283	276
Other accrued taxes	407	377
Accrued interest	118	105
Accrued compensation	233	221
Asset retirement obligations	265	202
Other regulatory liabilities	447	169
Operating lease obligations	144
Other current liabilities	187	183
Total current liabilities	4,697	3,909
Long-Term Debt:
Unamortized debt premium (discount), net	7	6
Unamortized debt issuance expense	(117)	(108)
Total long-term debt	10,791	9,364
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,257	3,062
Deferred credits related to income taxes	2,862	3,080
Accumulated deferred ITCs	255	262
Employee benefit obligations	540	599
Operating lease obligations, deferred	1,282
Asset retirement obligations, deferred	5,519	5,627
Accrued environmental remediation	0	0
Other deferred credits and liabilities	273	139
Total deferred credits and other liabilities	13,988	12,769
Total Liabilities	29,476	26,042
Common Stockholder's Equity:
Common stock	398	398
Paid-in capital	10,962	10,322
Retained earnings	3,756	3,612
Accumulated other comprehensive income (loss)	(51)	(9)
Total common stockholders' equity	15,065	14,323
Total Stockholders' Equity	15,065	14,323
Total Liabilities and Stockholder's Equity	44,541	40,365
Commitments and Contingent Matters
Mississippi Power
Current Assets:
Cash and cash equivalents	286	293
Receivables —
Customer accounts receivable	35	34
Unbilled revenues	39	41
Other accounts and notes receivable	26	31
Affiliated	27	21
Materials and supplies	61	53
Fossil fuel for generation	26	20
Other regulatory assets	99	116
Prepaid income taxes	0	12
Other current assets	10	7
Total current assets	609	628
Property, Plant, and Equipment:
In service	4,857	4,900
Less: Accumulated depreciation	1,463	1,429
Plant in service, net of depreciation	3,394	3,471
Construction work in progress	126	103
Total property, plant, and equipment	3,520	3,574
Other Property and Investments:
Total other property and investments	131	24
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	6
Deferred charges related to income taxes	32	33
Regulatory assets – asset retirement obligations, deferred	210	143
Other regulatory assets, deferred	360	331
Accumulated deferred income taxes	139	150
Other deferred charges and assets	34	3
Total deferred charges and other assets	775	660
Total Assets	5,035	4,886
Current Liabilities:
Securities due within one year	281	40
Accounts payable —
Affiliated	76	60
Other	75	90
Accrued income taxes	105	95
Accrued interest	15	15
Accrued compensation	35	38
Accrued plant closure costs	15	29
Asset retirement obligations	33	34
Other regulatory liabilities	21	12
Over recovered regulatory clause liabilities	29	14
Operating lease obligations	2
Other current liabilities	49	28
Total current liabilities	734	455
Long-Term Debt:
Unamortized debt premium (discount), net	(19)	(27)
Unamortized debt issuance expense	(8)	(8)
Total long-term debt	1,308	1,539
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	424	378
Deferred credits related to income taxes	352	382
Employee benefit obligations	99	115
Operating lease obligations, deferred	4
Asset retirement obligations, deferred	157	126
Other cost of removal obligations	189	185
Other regulatory liabilities, deferred	76	81
Other deferred credits and liabilities	44	16
Total deferred credits and other liabilities	1,341	1,283
Total Liabilities	3,383	3,277
Common Stockholder's Equity:
Common stock	38	38
Paid-in capital	4,449	4,546
Retained earnings	(2,832)	(2,971)
Accumulated other comprehensive income (loss)	(3)	(4)
Total common stockholders' equity	1,652	1,609
Total Stockholders' Equity	1,652	1,609
Total Liabilities and Stockholder's Equity	5,035	4,886
Commitments and Contingent Matters
Southern Power
Current Assets:
Cash and cash equivalents	279	181
Receivables —
Customer accounts receivable	107	111
Other accounts and notes receivable	73	116
Affiliated	30	55
Materials and supplies	191	220
Prepaid income taxes	36	25
Other current assets	43	37
Total current assets	759	745
Property, Plant, and Equipment:
In service	13,270	13,271
Less: Accumulated depreciation	2,464	2,171
Plant in service, net of depreciation	10,806	11,100
Construction work in progress	515	430
Total property, plant, and equipment	11,321	11,530
Other Property and Investments:
Intangible assets, net of amortization	322	345
Miscellaneous property and investments	28	0
Total other property and investments	350	345
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	369
Prepaid LTSAs	128	98
Income taxes receivable, non-current	5	30
Assets held for sale, deferred	601	576
Accumulated deferred income taxes	551	1,186
Other deferred charges and assets	216	373
Total deferred charges and other assets	1,870	2,263
Total Assets	14,300	14,883
Current Liabilities:
Securities due within one year	824	599
Notes payable	549	100
Accounts payable —
Affiliated	56	92
Other	85	77
Accrued income taxes	26	6
Accrued interest	32	36
Operating lease obligations	22
Other current liabilities	132	121
Total current liabilities	1,704	1,031
Long-Term Debt:
Unamortized debt premium (discount), net	(8)	(9)
Unamortized debt issuance expense	(19)	(23)
Total long-term debt	3,574	4,418
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	115	105
Accumulated deferred ITCs	1,731	1,832
Operating lease obligations, deferred	376
Other deferred credits and liabilities	178	213
Total deferred credits and other liabilities	2,400	2,150
Total Liabilities	7,678	7,599
Common Stockholder's Equity:
Common stock	0	0
Paid-in capital	909	1,600
Retained earnings	1,485	1,352
Accumulated other comprehensive income (loss)	(26)	16
Total common stockholders' equity	2,368	2,968
Noncontrolling Interests	4,254	4,316
Total Stockholders' Equity	6,622	7,284
Total Liabilities and Stockholder's Equity	14,300	14,883
Commitments and Contingent Matters
Southern Power | 2.375% due 2020
Long-Term Debt:
Senior notes	0	300
Southern Power | 2.50% due 2021
Long-Term Debt:
Senior notes	300	300
Southern Power | 1.00% due 2022
Long-Term Debt:
Senior notes	674	687
Southern Power | 2.75% due 2023
Long-Term Debt:
Senior notes	290	290
Southern Power | Weighted average interest rate 4.12% at 12/31/19 due 2025-2046
Long-Term Debt:
Senior notes	2,337	2,348
Southern Power | Variable rate (3.34% at 12/31/18) due 2020
Long-Term Debt:
Other long-term debt	0	525
Southern Company Gas
Current Assets:
Cash and cash equivalents	46	64
Receivables —
Customer accounts receivable	323	370
Energy marketing receivable	428	801
Unbilled revenues	183	213
Other accounts and notes receivable	114	142
Affiliated	5	11
Accumulated provision for uncollectible accounts	(18)	(30)
Natural gas for sale	479	524
Prepaid expenses	65	118
Assets from risk management activities, net of collateral	177	219
Other regulatory assets	92	73
Assets held for sale	171	0
Other current assets	41	50
Total current assets	2,106	2,555
Property, Plant, and Equipment:
In service	16,344	15,177
Less: Accumulated depreciation	4,650	4,400
Plant in service, net of depreciation	11,694	10,777
Construction work in progress	613	580
Total property, plant, and equipment	12,307	11,357
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,251	1,538
Other intangible assets, net of amortization	70	101
Miscellaneous property and investments	20	20
Total other property and investments	6,356	6,674
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	93
Other regulatory assets, deferred	618	669
Other deferred charges and assets	207	193
Total deferred charges and other assets	918	862
Total Assets	21,687	21,448
Current Liabilities:
Securities due within one year	0	357
Notes payable	650	650
Accounts payable —
Affiliated	41	45
Other	315	402
Energy marketing trade payables	442	856
Customer deposits	96	133
Accrued income taxes	0	66
Other accrued taxes	71	75
Accrued interest	52	55
Accrued compensation	100	100
Other regulatory liabilities	94	79
Liabilities from risk management activities	21	76
Operating lease obligations	14
Other current liabilities	128	130
Total current liabilities	2,010	3,024
Long-Term Debt:
Total long-term debt	5,845	5,583
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,219	1,016
Deferred credits related to income taxes	874	940
Employee benefit obligations	265	357
Operating lease obligations, deferred	78
Accrued environmental remediation	233	268
Other cost of removal obligations	1,606	1,585
Other deferred credits and liabilities	51	105
Total deferred credits and other liabilities	4,326	4,271
Total Liabilities	12,181	12,878
Common Stockholder's Equity:
Paid-in capital	9,697	8,856
Retained earnings	(198)	(312)
Accumulated other comprehensive income (loss)	7	26
Total common stockholders' equity	9,506	8,570
Total Stockholders' Equity	9,506	8,570
Total Liabilities and Stockholder's Equity	21,687	21,448
Commitments and Contingent Matters