Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenues:
Operating revenues	$ 4,620	$ 5,098	$ 9,638	$ 10,510
Operating Expenses:
Total cost of sales	144	191	583	877
Other operations and maintenance	1,203	1,320	2,498	2,634
Depreciation and amortization	873	755	1,730	1,506
Taxes other than income taxes	298	299	629	628
Estimated loss on Plant Vogtle Units 3 and 4	149	0	149	0
(Gain) loss on dispositions, net	0	(8)	(39)	(2,506)
Total operating expenses	3,562	3,756	7,317	5,477
Operating Income	1,058	1,342	2,321	5,033
Other Income and (Expense):
Allowance for equity funds used during construction	35	31	68	63
Earnings from equity method investments	30	33	72	81
Interest expense, net of amounts capitalized	(444)	(429)	(900)	(859)
Impairment of leveraged lease	(154)	0	(154)	0
Other income (expense), net	101	99	204	176
Total other income and (expense)	(432)	(266)	(710)	(539)
Earnings Before Income Taxes	626	1,076	1,611	4,494
Income taxes (benefit)	5	145	150	1,505
Consolidated Net Income	621	931	1,461	2,989
Dividends on preferred stock of subsidiaries	4	3	7	7
Net income (loss) attributable to noncontrolling interests	5	29	(26)	0
Net Income	$ 612	$ 899	$ 1,480	$ 2,982
Earnings per share -
Basic (in dollars per share)	$ 0.58	$ 0.86	$ 1.40	$ 2.86
Diluted (in dollars per share)	$ 0.58	$ 0.85	$ 1.39	$ 2.84
Average number of shares of common stock outstanding (in millions)
Basic (in shares)	1,058	1,044	1,057	1,041
Diluted (in shares)	1,063	1,052	1,065	1,049
Retail electric revenues
Operating Revenues:
Operating revenues	$ 3,182	$ 3,540	$ 6,260	$ 6,623
Wholesale electric revenues
Operating Revenues:
Operating revenues	472	542	889	1,041
Other electric revenues
Operating Revenues:
Operating revenues	168	161	320	331
Natural gas
Operating Revenues:
Operating revenues	636	689	1,885	2,163
Operating Expenses:
Total cost of sales	144	191	583	877
Other
Operating Revenues:
Operating revenues	162	166	284	352
Operating Expenses:
Total cost of sales	74	84	129	203
Fuel
Operating Expenses:
Total cost of sales	621	914	1,257	1,764
Purchased power
Operating Expenses:
Total cost of sales	200	201	381	371
Alternative revenue programs
Operating Revenues:
Operating revenues	(2)	1	7	0
ALABAMA POWER CO
Operating Revenues:
Operating revenues	1,365	1,513	2,716	2,921
Operating Expenses:
Other operations and maintenance	342	402	690	812
Depreciation and amortization	202	200	402	399
Taxes other than income taxes	102	98	208	200
Total operating expenses	924	1,068	1,853	2,138
Operating Income	441	445	863	783
Other Income and (Expense):
Allowance for equity funds used during construction	11	14	22	28
Interest expense, net of amounts capitalized	(83)	(82)	(171)	(165)
Other income (expense), net	26	11	48	25
Total other income and (expense)	(46)	(57)	(101)	(112)
Earnings Before Income Taxes	395	388	762	671
Income taxes (benefit)	93	89	177	151
Consolidated Net Income	302	299	585	520
Dividends on preferred stock of subsidiaries	4	3	7	7
Net Income	298	296	578	513
ALABAMA POWER CO | Retail electric revenues
Operating Revenues:
Operating revenues	1,223	1,378	2,427	2,592
ALABAMA POWER CO | Wholesale electric revenues
Operating Revenues:
Operating revenues	54	62	111	123
ALABAMA POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Operating revenues	7	4	26	63
ALABAMA POWER CO | Other
Operating Revenues:
Operating revenues	81	69	152	143
ALABAMA POWER CO | Fuel
Operating Expenses:
Total cost of sales	199	252	415	553
ALABAMA POWER CO | Purchased power
Operating Expenses:
Total cost of sales	49	47	89	84
ALABAMA POWER CO | Purchased power, affiliates
Operating Expenses:
Total cost of sales	30	69	49	90
GEORGIA POWER CO
Operating Revenues:
Operating revenues	1,928	2,117	3,754	3,951
Operating Expenses:
Other operations and maintenance	463	463	928	913
Depreciation and amortization	354	244	707	483
Taxes other than income taxes	108	115	221	220
Estimated loss on Plant Vogtle Units 3 and 4	149	0	149	0
Total operating expenses	1,555	1,470	2,976	2,857
Operating Income	373	647	778	1,094
Other Income and (Expense):
Allowance for equity funds used during construction			40	31
Interest expense, net of amounts capitalized	(105)	(105)	(216)	(201)
Other income (expense), net	51	35	103	77
Total other income and (expense)	(54)	(70)	(113)	(124)
Earnings Before Income Taxes	319	577	665	970
Income taxes (benefit)	11	129	27	211
Consolidated Net Income	308	448	638	759
GEORGIA POWER CO | Retail electric revenues
Operating Revenues:
Operating revenues	1,760	1,946	3,435	3,614
GEORGIA POWER CO | Wholesale electric revenues
Operating Revenues:
Operating revenues	25	36	51	67
GEORGIA POWER CO | Other
Operating Revenues:
Operating revenues	143	135	268	270
GEORGIA POWER CO | Fuel
Operating Expenses:
Total cost of sales	226	390	458	689
GEORGIA POWER CO | Purchased power
Operating Expenses:
Total cost of sales	133	124	262	242
GEORGIA POWER CO | Purchased power, affiliates
Operating Expenses:
Total cost of sales	122	134	251	310
MISSISSIPPI POWER CO
Operating Revenues:
Operating revenues	283	313	559	600
Operating Expenses:
Other operations and maintenance	67	72	142	133
Depreciation and amortization	46	48	88	95
Taxes other than income taxes	30	28	59	55
Total operating expenses	233	259	463	490
Operating Income	50	54	96	110
Other Income and (Expense):
Interest expense, net of amounts capitalized	(15)	(17)	(31)	(35)
Other income (expense), net	6	5	14	11
Total other income and (expense)	(9)	(12)	(17)	(24)
Earnings Before Income Taxes	41	42	79	86
Income taxes (benefit)	2	5	8	12
Consolidated Net Income	39	37	71	74
MISSISSIPPI POWER CO | Retail electric revenues
Operating Revenues:
Operating revenues	199	215	398	418
MISSISSIPPI POWER CO | Wholesale electric revenues
Operating Revenues:
Operating revenues	52	57	103	114
MISSISSIPPI POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Operating revenues	25	37	47	58
MISSISSIPPI POWER CO | Other
Operating Revenues:
Operating revenues	7	4	11	10
MISSISSIPPI POWER CO | Fuel
Operating Expenses:
Total cost of sales	83	105	162	198
MISSISSIPPI POWER CO | Purchased power
Operating Expenses:
Total cost of sales	7	6	12	9
SOUTHERN POWER CO
Operating Revenues:
Operating revenues	439	510	814	953
Operating Expenses:
Other operations and maintenance	77	79	156	166
Depreciation and amortization	121	119	239	237
Taxes other than income taxes	10	11	19	21
(Gain) loss on dispositions, net	0	(23)	(39)	(23)
Total operating expenses	328	357	616	740
Operating Income	111	153	198	213
Other Income and (Expense):
Interest expense, net of amounts capitalized	(38)	(41)	(77)	(84)
Other income (expense), net	1	40	4	41
Total other income and (expense)	(37)	(1)	(73)	(43)
Earnings Before Income Taxes	74	152	125	170
Income taxes (benefit)	6	(51)	13	(60)
Consolidated Net Income	68	203	112	230
Net income (loss) attributable to noncontrolling interests	5	29	(26)	0
Net Income	63	174	138	230
SOUTHERN POWER CO | Wholesale electric revenues
Operating Revenues:
Operating revenues	343	390	629	743
SOUTHERN POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Operating revenues	92	117	178	204
SOUTHERN POWER CO | Other
Operating Revenues:
Operating revenues	4	3	7	6
SOUTHERN POWER CO | Fuel
Operating Expenses:
Total cost of sales	102	139	209	284
SOUTHERN POWER CO | Purchased power
Operating Expenses:
Total cost of sales	18	32	32	55
SOUTHERN Co GAS
Operating Revenues:
Operating revenues	636	689	1,885	2,163
Operating Expenses:
Other operations and maintenance	220	199	479	433
Depreciation and amortization	123	119	243	238
Taxes other than income taxes	47	46	118	128
Total operating expenses	534	555	1,423	1,676
Operating Income	102	134	462	487
Other Income and (Expense):
Earnings from equity method investments	30	31	72	80
Interest expense, net of amounts capitalized	(57)	(59)	(114)	(118)
Other income (expense), net	12	6	21	10
Total other income and (expense)	(15)	(22)	(21)	(28)
Earnings Before Income Taxes	87	112	441	459
Income taxes (benefit)	16	6	95	83
Consolidated Net Income	71	106	346	376
Net Income	71	106	346	376
SOUTHERN Co GAS | Natural gas
Operating Revenues:
Operating revenues	638	688	1,878	2,163
Operating Expenses:
Total cost of sales	144	191	583	877
SOUTHERN Co GAS | Alternative revenue programs
Operating Revenues:
Operating revenues	$ (2)	$ 1	$ 7	$ 0