Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Revenues:
Retail revenues	$ 14,987	$ 15,550	$ 14,541
Wholesale revenues	1,798	2,184	1,855
Other electric revenues	657	672	639
Other revenues	47	61	52
Total operating revenues	17,489	18,467	17,087
Operating Expenses:
Fuel	4,750	6,005	5,510
Purchased power	645	672	461
Other operations and maintenance	4,416	4,354	3,846
Depreciation and amortization	2,034	1,945	1,901
Taxes other than income taxes	997	981	934
Estimated loss on Kemper IGCC	365	868	1,180
Total operating expenses	13,207	14,825	13,832
Operating Income	4,282	3,642	3,255
Other Income and (Expense):
Allowance for equity funds used during construction	226	245	190
Interest income	23	19	19
Interest expense, net of amounts capitalized	(840)	(835)	(824)
Other income (expense), net	(62)	(63)	(81)
Total other income and (expense)	(653)	(634)	(696)
Earnings Before Income Taxes	3,629	3,008	2,559
Income taxes	1,194	977	849
Net Income (loss)	2,435	2,031	1,710
Dividends on Preferred and Preference Stock	54	68	66
Net income attributable to noncontrolling interests	14	0	0
Net Income After Dividends on Preferred and Preference Stock	$ 2,367	$ 1,963	$ 1,644
Earnings per share (EPS) —
Basic EPS (in dollars per share)	$ 2.60	$ 2.19	$ 1.88
Diluted EPS (in dollars per share)	$ 2.59	$ 2.18	$ 1.87
Average number of shares of common stock outstanding — (in millions)
Basic shares	910	897	877
Diluted shares	914	901	881
Alabama Power [Member]
Operating Revenues:
Retail revenues	$ 5,234	$ 5,249	$ 4,952
Wholesale revenues, non-affiliates	241	281	248
Wholesale revenues, affiliates	84	189	212
Other revenues	209	223	206
Total operating revenues	5,768	5,942	5,618
Operating Expenses:
Fuel	1,342	1,605	1,631
Purchased power, non-affiliates	171	185	100
Purchased power, affiliates	180	200	129
Other operations and maintenance	1,501	1,468	1,289
Depreciation and amortization	643	603	645
Taxes other than income taxes	368	356	348
Total operating expenses	4,205	4,417	4,142
Operating Income	1,563	1,525	1,476
Other Income and (Expense):
Allowance for equity funds used during construction	60	49	32
Interest income	15	15	16
Interest expense, net of amounts capitalized	(274)	(255)	(259)
Other income (expense), net	(47)	(22)	(36)
Total other income and (expense)	(246)	(213)	(247)
Earnings Before Income Taxes	1,317	1,312	1,229
Income taxes	506	512	478
Net Income (loss)	811	800	751
Dividends on Preferred and Preference Stock	26	39	39
Net Income After Dividends on Preferred and Preference Stock	785	761	712
Georgia Power [Member]
Operating Revenues:
Retail revenues	7,727	8,240	7,620
Wholesale revenues, non-affiliates	215	335	281
Wholesale revenues, affiliates	20	42	20
Other revenues	364	371	353
Total operating revenues	8,326	8,988	8,274
Operating Expenses:
Fuel	2,033	2,547	2,307
Purchased power, non-affiliates	289	287	224
Purchased power, affiliates	575	701	660
Other operations and maintenance	1,844	1,902	1,654
Depreciation and amortization	846	846	807
Taxes other than income taxes	391	409	382
Total operating expenses	5,978	6,692	6,034
Operating Income	2,348	2,296	2,240
Other Income and (Expense):
Allowance for equity funds used during construction	40	45	30
Interest expense, net of amounts capitalized	(363)	(348)	(361)
Other income (expense), net	61	23	35
Total other income and (expense)	(302)	(325)	(326)
Earnings Before Income Taxes	2,046	1,971	1,914
Income taxes	769	729	723
Net Income (loss)	1,277	1,242	1,191
Dividends on Preferred and Preference Stock	17	17	17
Net Income After Dividends on Preferred and Preference Stock	1,260	1,225	1,174
Gulf Power [Member]
Operating Revenues:
Retail revenues	1,249	1,267	1,170
Wholesale revenues, non-affiliates	107	129	109
Wholesale revenues, affiliates	58	130	100
Other revenues	69	64	61
Total operating revenues	1,483	1,590	1,440
Operating Expenses:
Fuel	445	605	533
Purchased power, non-affiliates	100	82	52
Purchased power, affiliates	35	25	33
Other operations and maintenance	354	341	310
Depreciation and amortization	141	145	149
Taxes other than income taxes	118	111	98
Total operating expenses	1,193	1,309	1,175
Operating Income	290	281	265
Other Income and (Expense):
Allowance for equity funds used during construction	13	12	6
Interest expense, net of amounts capitalized	(49)	(53)	(56)
Other income (expense), net	(5)	(3)	(3)
Total other income and (expense)	(41)	(44)	(53)
Earnings Before Income Taxes	249	237	212
Income taxes	92	88	80
Net Income (loss)	157	149	132
Dividends on Preferred and Preference Stock	9	9	8
Net Income After Dividends on Preferred and Preference Stock	148	140	124
Mississippi Power [Member]
Operating Revenues:
Retail revenues	776	795	799
Wholesale revenues, non-affiliates	270	323	294
Wholesale revenues, affiliates	76	107	35
Other revenues	16	18	17
Total operating revenues	1,138	1,243	1,145
Operating Expenses:
Fuel	443	574	491
Purchased power, non-affiliates	5	18	6
Purchased power, affiliates	7	25	43
Other operations and maintenance	274	271	253
Depreciation and amortization	123	97	91
Taxes other than income taxes	94	79	81
Estimated loss on Kemper IGCC	365	868	1,102
Total operating expenses	1,311	1,932	2,067
Operating Income	(173)	(689)	(922)
Other Income and (Expense):
Allowance for equity funds used during construction	110	136	122
Interest expense, net of amounts capitalized	(7)	(45)	(36)
Other income (expense), net	(8)	(14)	(7)
Total other income and (expense)	95	77	79
Earnings Before Income Taxes	(78)	(612)	(843)
Income taxes	(72)	(285)	(368)
Net Income (loss)	(6)	(327)	(475)
Dividends on Preferred and Preference Stock	2	2	2
Net Income After Dividends on Preferred and Preference Stock	(8)	(329)	(477)
Southern Power [Member]
Operating Revenues:
Wholesale revenues, non-affiliates	964	1,116	923
Wholesale revenues, affiliates	417	383	346
Other revenues	9	2	6
Total operating revenues	1,390	1,501	1,275
Operating Expenses:
Fuel	441	596	474
Purchased power, non-affiliates	72	105	76
Purchased power, affiliates	21	66	30
Other operations and maintenance	260	237	209
Depreciation and amortization	248	220	175
Taxes other than income taxes	22	22	21
Total operating expenses	1,064	1,246	985
Operating Income	326	255	290
Other Income and (Expense):
Interest expense, net of amounts capitalized	(77)	(89)	(74)
Other income (expense), net	1	6	(4)
Total other income and (expense)	(76)	(83)	(78)
Earnings Before Income Taxes	250	172	212
Income taxes	21	(3)	46
Net Income (loss)	229	175	166
Net income attributable to noncontrolling interests	14	3	0
Net Income (Loss) Attributable to Parent	$ 215	$ 172	$ 166