Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Revenues:
Total operating revenues	$ 5,098	$ 5,627	$ 10,510	$ 11,999
Operating Expenses:
Other operations and maintenance	1,316	1,523	2,628	2,972
Depreciation and amortization	755	783	1,506	1,552
Taxes other than income taxes	299	316	628	671
Estimated loss on plants under construction	4	1,060	6	1,105
(Gain) loss on dispositions, net	(8)	36	(2,506)	36
Asset impairment			32	161
Goodwill impairment	32		32
Total operating expenses	3,756	5,564	5,477	10,560
Operating Income	1,342	63	5,033	1,439
Other Income and (Expense):
Allowance for equity funds used during construction	31	32	63	63
Earnings from equity method investments	33	31	81	72
Interest expense, net of amounts capitalized	(429)	(470)	(859)	(928)
Other income (expense), net	99	78	176	138
Total other income and (expense)	(266)	(329)	(539)	(655)
Earnings (Loss) Before Income Taxes	1,076	(266)	4,494	784
Income taxes (benefit)	145	(139)	1,505	(25)
Consolidated Net Income (Loss)	931	(127)	2,989	809
Dividends on preferred stock of subsidiaries	3	4	7	8
Net income attributable to noncontrolling interests	29	23	0	17
Net Income (Loss)	$ 899	$ (154)	$ 2,982	$ 784
Earnings (loss) per share -
Basic (in dollars per share)	$ 0.86	$ (0.15)	$ 2.86	$ 0.77
Diluted (in dollars per share)	$ 0.85	$ (0.15)	$ 2.84	$ 0.77
Average number of shares of common stock outstanding (in millions)
Basic (in shares)	1,044	1,014	1,041	1,012
Diluted (in shares)	1,052	1,014	1,049	1,017
Retail electric revenues
Operating Revenues:
Total operating revenues	$ 3,540	$ 3,740	$ 6,623	$ 7,308
Wholesale electric revenues
Operating Revenues:
Total operating revenues	542	616	1,041	1,239
Other electric revenues
Operating Revenues:
Total operating revenues	161	170	331	330
Natural gas
Operating Revenues:
Total operating revenues	689	706	2,163	2,314
Operating Expenses:
Total cost of natural gas	191	228	877	949
Other
Operating Revenues:
Total operating revenues	166	395	352	808
Operating Expenses:
Total cost of natural gas	84	279	203	568
Fuel
Operating Expenses:
Total cost of natural gas	914	1,103	1,764	2,204
Purchased power
Operating Expenses:
Total cost of natural gas	201	236	371	503
ALABAMA POWER CO
Operating Revenues:
Total operating revenues	1,513	1,503	2,921	2,976
Operating Expenses:
Other operations and maintenance	402	402	812	788
Depreciation and amortization	200	189	399	379
Taxes other than income taxes	98	94	200	192
Total operating expenses	1,068	1,123	2,138	2,224
Operating Income	445	380	783	752
Other Income and (Expense):
Allowance for equity funds used during construction	14	14	28	27
Interest expense, net of amounts capitalized	(82)	(80)	(165)	(158)
Other income (expense), net	11	12	25	15
Total other income and (expense)	(57)	(54)	(112)	(116)
Earnings (Loss) Before Income Taxes	388	326	671	636
Income taxes (benefit)	89	64	151	145
Consolidated Net Income (Loss)	299	262	520	491
Dividends on preferred stock of subsidiaries	3	3	7	7
Net Income (Loss)	296	259	513	484
ALABAMA POWER CO | Retail electric revenues
Operating Revenues:
Total operating revenues	1,378	1,338	2,592	2,624
ALABAMA POWER CO | Wholesale electric revenues
Operating Revenues:
Total operating revenues	62	65	123	139
ALABAMA POWER CO | Other
Operating Revenues:
Total operating revenues	69	69	143	131
ALABAMA POWER CO | Fuel
Operating Expenses:
Total cost of natural gas	252	347	553	672
ALABAMA POWER CO | Purchased power
Operating Expenses:
Total cost of natural gas	47	48	84	113
ALABAMA POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	4	31	63	82
ALABAMA POWER CO | Purchased power, affiliates
Operating Expenses:
Total cost of natural gas	69	43	90	80
GEORGIA POWER CO
Operating Revenues:
Total operating revenues	2,117	2,048	3,951	4,008
Operating Expenses:
Other operations and maintenance	463	457	913	863
Depreciation and amortization	244	230	483	458
Taxes other than income taxes	115	106	220	214
Estimated loss on plants under construction	0	1,060	0	1,060
Total operating expenses	1,470	2,520	2,857	3,967
Operating Income	647	(472)	1,094	41
Other Income and (Expense):
Interest expense, net of amounts capitalized	(105)	(102)	(201)	(208)
Other income (expense), net	35	35	77	73
Total other income and (expense)	(70)	(67)	(124)	(135)
Earnings (Loss) Before Income Taxes	577	(539)	970	(94)
Income taxes (benefit)	129	(143)	211	(50)
Consolidated Net Income (Loss)	448	(396)	759	(44)
Net Income (Loss)	448	(396)
GEORGIA POWER CO | Retail electric revenues
Operating Revenues:
Total operating revenues	1,946	1,889	3,614	3,688
GEORGIA POWER CO | Wholesale electric revenues
Operating Revenues:
Total operating revenues	33	36	62	80
GEORGIA POWER CO | Other
Operating Revenues:
Total operating revenues	135	120	270	227
GEORGIA POWER CO | Fuel
Operating Expenses:
Total cost of natural gas	390	378	689	790
GEORGIA POWER CO | Purchased power
Operating Expenses:
Total cost of natural gas	124	111	242	233
GEORGIA POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	3	3	5	13
GEORGIA POWER CO | Purchased power, affiliates
Operating Expenses:
Total cost of natural gas	134	178	310	349
MISSISSIPPI POWER CO
Operating Revenues:
Total operating revenues	313	297	600	598
Operating Expenses:
Other operations and maintenance	68	67	127	141
Depreciation and amortization	48	44	95	84
Taxes other than income taxes	28	27	55	54
Estimated loss on plants under construction	4	0	6	45
Total operating expenses	259	243	490	537
Operating Income	54	54	110	61
Other Income and (Expense):
Interest expense, net of amounts capitalized	(17)	(21)	(35)	(39)
Other income (expense), net	5	27	11	27
Total other income and (expense)	(12)	6	(24)	(12)
Earnings (Loss) Before Income Taxes	42	60	86	49
Income taxes (benefit)	5	13	12	9
Consolidated Net Income (Loss)	37	47	74	40
Dividends on preferred stock of subsidiaries	0	1	0	1
Net Income (Loss)	37	46	74	39
MISSISSIPPI POWER CO | Retail electric revenues
Operating Revenues:
Total operating revenues	215	212	418	406
MISSISSIPPI POWER CO | Wholesale electric revenues
Operating Revenues:
Total operating revenues	57	59	114	127
MISSISSIPPI POWER CO | Other
Operating Revenues:
Total operating revenues	4	7	10	11
MISSISSIPPI POWER CO | Fuel
Operating Expenses:
Total cost of natural gas	105	98	198	197
MISSISSIPPI POWER CO | Purchased power
Operating Expenses:
Total cost of natural gas	6	7	9	16
MISSISSIPPI POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	37	19	58	54
SOUTHERN POWER CO
Operating Revenues:
Total operating revenues	510	555	953	1,064
Operating Expenses:
Other operations and maintenance	79	91	166	184
Depreciation and amortization	119	125	237	240
Taxes other than income taxes	11	12	21	24
(Gain) loss on dispositions, net	(23)	0	(23)	0
Asset impairment	0	119	0	119
Total operating expenses	357	539	740	988
Operating Income	153	16	213	76
Other Income and (Expense):
Interest expense, net of amounts capitalized	(41)	(46)	(84)	(93)
Other income (expense), net	40	2	41	5
Total other income and (expense)	(1)	(44)	(43)	(88)
Earnings (Loss) Before Income Taxes	152	(28)	170	(12)
Income taxes (benefit)	(51)	(73)	(60)	(172)
Consolidated Net Income (Loss)	203	45	230	160
Net income attributable to noncontrolling interests	29	23	0	17
Net Income (Loss)	174	22	230	143
SOUTHERN POWER CO | Wholesale electric revenues
Operating Revenues:
Total operating revenues	390	443	743	867
SOUTHERN POWER CO | Other
Operating Revenues:
Total operating revenues	3	3	6	5
SOUTHERN POWER CO | Fuel
Operating Expenses:
Total cost of natural gas	139	153	284	321
SOUTHERN POWER CO | Purchased power
Operating Expenses:
Total cost of natural gas	32	39	55	100
SOUTHERN POWER CO | Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	117	109	204	192
SOUTHERN Co GAS
Operating Revenues:
Total operating revenues	689	730	2,163	2,369
Operating Expenses:
Other operations and maintenance	199	238	433	514
Depreciation and amortization	119	126	238	255
Taxes other than income taxes	46	48	128	125
(Gain) loss on dispositions, net	0	36	0	36
Goodwill impairment	0	0	0	42
Total operating expenses	555	681	1,676	1,933
Operating Income	134	49	487	436
Other Income and (Expense):
Earnings from equity method investments	31	31	80	74
Interest expense, net of amounts capitalized	(59)	(59)	(118)	(118)
Other income (expense), net	6	3	10	15
Total other income and (expense)	(22)	(25)	(28)	(29)
Earnings (Loss) Before Income Taxes	112	24	459	407
Income taxes (benefit)	6	55	83	159
Consolidated Net Income (Loss)	106	(31)	376	248
Net Income (Loss)	106	(31)	376	248
SOUTHERN Co GAS | Natural gas
Operating Revenues:
Total operating revenues	688	710	2,163	2,341
Operating Expenses:
Total cost of natural gas	191	228	877	949
SOUTHERN Co GAS | Other
Operating Revenues:
Total operating revenues	0	24	0	55
Operating Expenses:
Total cost of natural gas	0	5	0	12
SOUTHERN Co GAS | Alternative revenue programs
Operating Revenues:
Total operating revenues	$ 1	$ (4)	$ 0	$ (27)