Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 754	$ 1,404
Receivables —
Customer accounts receivable	988	1,058
Unbilled revenues	380	397
Under recovered regulatory clause revenues	43	63
Income taxes receivable, current	0	144
Other accounts and notes receivable	236	398
Accumulated provision for uncollectible accounts	(13)	(13)
Fossil fuel stock, at average cost	837	868
Materials and supplies, at average cost	1,085	1,061
Vacation pay	181	178
Other regulatory assets, current	394	402
Prepaid expenses	486	495
Other current assets	90	71
Total current assets	5,461	6,526
Property, Plant, and Equipment:
In service	76,553	75,118
Less accumulated provision for depreciation	24,566	24,253
Plant in service, net of depreciation	51,987	50,865
Other utility plant, net	218	233
Nuclear fuel, at amortized cost	941	934
Construction work in progress	9,406	9,082
Total property, plant, and equipment	62,552	61,114
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,540	1,512
Leveraged leases	761	755
Miscellaneous property and investments	488	485
Total other property and investments	2,789	2,752
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,572	1,560
Unamortized loss on reacquired debt	220	227
Other regulatory assets, deferred	4,957	4,989
Income taxes receivable, non-current	413	413
Other deferred charges and assets	771	737
Total deferred charges and other assets	7,933	7,926
Total Assets	78,735	78,318
Current Liabilities:
Securities due within one year	2,392	2,674
Notes payable	1,195	1,376
Accounts payable —
Accounts payable	1,584	1,905
Customer deposits	406	404
Accrued taxes —
Accrued income taxes	14	19
Other accrued taxes	240	484
Accrued interest	255	249
Accrued vacation pay	228	228
Accrued compensation	212	549
Asset retirement obligations, current	237	217
Liabilities from risk management activities	319	156
Other regulatory liabilities, current	210	278
Other current liabilities	564	590
Total current liabilities	7,856	9,129
Long-term Debt:
Total Long-term Debt	26,091	24,688
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	12,274	12,322
Deferred credits related to income taxes	185	187
Accumulated deferred investment tax credits	1,350	1,219
Employee benefit obligations	2,546	2,582
Asset retirement obligations, deferred	3,504	3,542
Unrecognized tax benefits	375	370
Other cost of removal obligations	1,151	1,162
Other regulatory liabilities, deferred	303	254
Other deferred credits and liabilities	754	720
Total deferred credits and other liabilities	22,442	22,358
Total Liabilities	56,389	56,175
Redeemable Preferred Stock of Subsidiaries	118	118
Redeemable Noncontrolling Interest	44	43
Common Stockholders' Equity:
Common stock	4,604	4,572
Paid-in capital	6,582	6,282
Treasury, at cost	(144)	(142)
Retained earnings (accumulated deficit)	9,999	10,010
Accumulated other comprehensive income (loss)	(244)	(130)
Total common stockholders' equity	20,797	20,592
Preferred and Preference Stock of Subsidiaries	609	609
Noncontrolling Interests	778	781
Total Stockholders' Equity	22,184	21,982
Total Liabilities and Stockholders' Equity	78,735	78,318
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	444	194
Receivables —
Customer accounts receivable	311	332
Unbilled revenues	113	119
Under recovered regulatory clause revenues	22	43
Income taxes receivable, current	0	142
Other accounts and notes receivable	25	20
Affiliated companies	38	50
Accumulated provision for uncollectible accounts	(10)	(10)
Fossil fuel stock, at average cost	266	239
Materials and supplies, at average cost	406	398
Vacation pay	67	66
Other regulatory assets, current	99	115
Prepaid expenses	129	83
Other current assets	10	10
Total current assets	1,920	1,801
Property, Plant, and Equipment:
In service	25,187	24,750
Less accumulated provision for depreciation	8,791	8,736
Plant in service, net of depreciation	16,396	16,014
Nuclear fuel, at amortized cost	359	363
Construction work in progress	550	801
Total property, plant, and equipment	17,305	17,178
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	68	71
Nuclear decommissioning trusts, at fair value	746	737
Miscellaneous property and investments	99	96
Total other property and investments	913	904
Deferred Charges and Other Assets:
Deferred charges related to income taxes	520	522
Deferred under recovered regulatory clause revenues	105	99
Other regulatory assets, deferred	1,105	1,114
Other deferred charges and assets	109	103
Total deferred charges and other assets	1,839	1,838
Total Assets	21,977	21,721
Current Liabilities:
Securities due within one year	200	200
Accounts payable —
Affiliated accounts payable	258	278
Other accounts payable	271	410
Customer deposits	88	88
Accrued taxes —
Accrued income taxes	11	0
Other accrued taxes	62	38
Accrued interest	65	73
Accrued vacation pay	55	55
Accrued compensation	47	119
Liabilities from risk management activities	37	55
Other regulatory liabilities, current	175	240
Other current liabilities	39	39
Total current liabilities	1,308	1,595
Long-term Debt:
Total Long-term Debt	6,894	6,654
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,306	4,241
Deferred credits related to income taxes	69	70
Accumulated deferred investment tax credits	116	118
Employee benefit obligations	377	388
Asset retirement obligations, deferred	1,461	1,448
Other cost of removal obligations	705	722
Other regulatory liabilities, deferred	119	136
Deferred over recovered regulatory clause revenues	64	0
Other deferred credits and liabilities	78	76
Total deferred credits and other liabilities	7,295	7,199
Total Liabilities	15,497	15,448
Redeemable Preferred Stock	85	85
Preference Stock	196	196
Common Stockholders' Equity:
Common stock	1,222	1,222
Paid-in capital	2,585	2,341
Retained earnings (accumulated deficit)	2,425	2,461
Accumulated other comprehensive income (loss)	(33)	(32)
Total common stockholders' equity	6,199	5,992
Total Liabilities and Stockholders' Equity	21,977	21,721
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	60	67
Receivables —
Customer accounts receivable	509	541
Unbilled revenues	182	188
Joint owner accounts receivable	73	227
Income taxes receivable, current	0	114
Other accounts and notes receivable	37	57
Affiliated companies	16	18
Accumulated provision for uncollectible accounts	(2)	(2)
Fossil fuel stock, at average cost	366	402
Materials and supplies, at average cost	463	449
Vacation pay	92	91
Other regulatory assets, current	126	123
Prepaid income taxes	118	156
Other current assets	61	92
Total current assets	2,101	2,523
Property, Plant, and Equipment:
In service	32,318	31,841
Less accumulated provision for depreciation	11,045	10,903
Plant in service, net of depreciation	21,273	20,938
Other utility plant, net	158	171
Nuclear fuel, at amortized cost	582	572
Construction work in progress	4,817	4,775
Total property, plant, and equipment	26,830	26,456
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	60	64
Nuclear decommissioning trusts, at fair value	793	775
Miscellaneous property and investments	43	43
Total other property and investments	896	882
Deferred Charges and Other Assets:
Deferred charges related to income taxes	680	679
Other regulatory assets, deferred	2,138	2,152
Other deferred charges and assets	157	173
Total deferred charges and other assets	2,975	3,004
Total Assets	32,802	32,865
Current Liabilities:
Securities due within one year	458	712
Notes payable	0	158
Accounts payable —
Affiliated accounts payable	370	411
Other accounts payable	549	750
Customer deposits	266	264
Accrued taxes —
Accrued income taxes	0	12
Other accrued taxes	101	325
Accrued interest	102	99
Accrued vacation pay	62	62
Accrued compensation	60	142
Asset retirement obligations, current	184	179
Other current liabilities	211	181
Total current liabilities	2,363	3,295
Long-term Debt:
Total Long-term Debt	10,268	9,616
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	5,686	5,627
Deferred credits related to income taxes	105	105
Accumulated deferred investment tax credits	201	204
Employee benefit obligations	930	949
Asset retirement obligations, deferred	1,699	1,737
Other deferred credits and liabilities	395	347
Total deferred credits and other liabilities	9,016	8,969
Total Liabilities	21,647	21,880
Redeemable Preferred Stock	45	45
Preference Stock	221	221
Common Stockholders' Equity:
Common stock	398	398
Paid-in capital	6,504	6,275
Retained earnings (accumulated deficit)	4,002	4,061
Accumulated other comprehensive income (loss)	(15)	(15)
Total common stockholders' equity	10,889	10,719
Total Liabilities and Stockholders' Equity	32,802	32,865
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	48	74
Receivables —
Customer accounts receivable	64	76
Unbilled revenues	52	54
Under recovered regulatory clause revenues	21	20
Income taxes receivable, current	0	27
Other accounts and notes receivable	5	9
Affiliated companies	8	1
Accumulated provision for uncollectible accounts	(1)	(1)
Fossil fuel stock, at average cost	93	108
Materials and supplies, at average cost	58	56
Other regulatory assets, current	90	90
Other current assets	18	22
Total current assets	456	536
Property, Plant, and Equipment:
In service	5,058	5,045
Less accumulated provision for depreciation	1,324	1,296
Plant in service, net of depreciation	3,734	3,749
Other utility plant, net	60	62
Construction work in progress	57	48
Total property, plant, and equipment	3,851	3,859
Other Property and Investments:
Total other property and investments	4	4
Deferred Charges and Other Assets:
Deferred charges related to income taxes	60	61
Other regulatory assets, deferred	420	427
Other deferred charges and assets	37	33
Total deferred charges and other assets	517	521
Total Assets	4,828	4,920
Current Liabilities:
Securities due within one year	110	110
Notes payable	56	142
Accounts payable —
Affiliated accounts payable	46	55
Other accounts payable	42	44
Customer deposits	36	36
Accrued taxes —
Accrued income taxes	10	4
Other accrued taxes	16	9
Accrued interest	20	9
Accrued compensation	8	25
Deferred capacity expense, current	22	22
Liabilities from risk management activities	54	49
Other regulatory liabilities, current	22	22
Other current liabilities	38	40
Total current liabilities	480	567
Long-term Debt:
Total Long-term Debt	1,193	1,193
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	899	893
Employee benefit obligations	128	129
Deferred capacity expense	136	141
Asset retirement obligations, deferred	114	113
Other cost of removal obligations	233	233
Other regulatory liabilities, deferred	45	47
Other deferred credits and liabilities	100	102
Total deferred credits and other liabilities	1,655	1,658
Total Liabilities	3,328	3,418
Preference Stock	147	147
Common Stockholders' Equity:
Common stock	503	503
Paid-in capital	569	567
Retained earnings (accumulated deficit)	284	285
Accumulated other comprehensive income (loss)	(3)	0
Total common stockholders' equity	1,353	1,355
Total Liabilities and Stockholders' Equity	4,828	4,920
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	58	98
Receivables —
Customer accounts receivable	23	26
Unbilled revenues	32	36
Income taxes receivable, current	0	20
Other accounts and notes receivable	6	10
Affiliated companies	7	20
Fossil fuel stock, at average cost	99	104
Materials and supplies, at average cost	76	75
Other regulatory assets, current	101	95
Prepaid income taxes	42	39
Other current assets	5	8
Total current assets	449	531
Property, Plant, and Equipment:
In service	4,905	4,886
Less accumulated provision for depreciation	1,287	1,262
Plant in service, net of depreciation	3,618	3,624
Construction work in progress	2,400	2,254
Total property, plant, and equipment	6,018	5,878
Other Property and Investments:
Total other property and investments	11	11
Deferred Charges and Other Assets:
Deferred charges related to income taxes	303	290
Other regulatory assets, deferred	520	525
Income taxes receivable, non-current	544	544
Other deferred charges and assets	71	61
Total deferred charges and other assets	1,438	1,420
Total Assets	7,916	7,840
Current Liabilities:
Securities due within one year	303	728
Notes payable	25	500
Accounts payable —
Affiliated accounts payable	82	85
Other accounts payable	108	135
Customer deposits	16	16
Accrued taxes —
Accrued income taxes	25	85
Accrued interest	21	18
Accrued compensation	10	26
Asset retirement obligations, current	39	22
Over recovered regulatory clause liabilities	106	96
Customer liability associated with Kemper refunds	22	73
Other current liabilities	55	52
Total current liabilities	812	1,836
Long-term Debt:
Long-term debt, affiliated	776	576
Long-term debt, non-affiliated	2,206	1,310
Total Long-term Debt	2,982	1,886
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	771	762
Deferred credits related to income taxes	8	8
Accumulated deferred investment tax credits	5	5
Employee benefit obligations	149	153
Asset retirement obligations, deferred	136	154
Unrecognized tax benefits	368	368
Other cost of removal obligations	167	165
Other regulatory liabilities, deferred	71	71
Other deferred credits and liabilities	41	40
Total deferred credits and other liabilities	1,716	1,726
Total Liabilities	5,510	5,448
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Common stock	38	38
Paid-in capital	2,896	2,893
Retained earnings (accumulated deficit)	(555)	(566)
Accumulated other comprehensive income (loss)	(6)	(6)
Total common stockholders' equity	2,373	2,359
Total Liabilities and Stockholders' Equity	7,916	7,840
Southern Power [Member]
Current Assets:
Cash and cash equivalents	53	830
Receivables —
Customer accounts receivable	76	75
Other accounts and notes receivable	23	19
Affiliated companies	31	30
Fossil fuel stock, at average cost	14	16
Materials and supplies, at average cost	63	63
Prepaid income taxes	77	45
Prepaid expenses	23	23
Assets from risk management activities	6	7
Total current assets	366	1,108
Property, Plant, and Equipment:
In service	7,738	7,275
Less accumulated provision for depreciation	1,299	1,248
Plant in service, net of depreciation	6,439	6,027
Construction work in progress	1,535	1,137
Total property, plant, and equipment	7,974	7,164
Other Property and Investments:
Goodwill	2	2
Other intangible assets, net of amortization	316	317
Total other property and investments	318	319
Deferred Charges and Other Assets:
Prepaid long-term service agreements	184	166
Other deferred charges and assets -- affiliated	20	9
Other deferred charges and assets	137	139
Total deferred charges and other assets	341	314
Total Assets	8,999	8,905
Current Liabilities:
Securities due within one year	401	403
Notes payable	413	137
Accounts payable —
Affiliated accounts payable	62	66
Other accounts payable	347	327
Accrued taxes —
Accrued income taxes	9	198
Other accrued taxes	16	5
Accrued interest	25	23
Contingent consideration	21	36
Other current liabilities	49	44
Total current liabilities	1,343	1,239
Long-term Debt:
Total Long-term Debt	2,722	2,719
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	470	601
Accumulated deferred investment tax credits	1,025	889
Accrued income taxes, non-current	109	109
Asset retirement obligations, deferred	25	21
Deferred capacity revenues -- affiliated	6	17
Other deferred credits and liabilities	11	3
Total deferred credits and other liabilities	1,646	1,640
Total Liabilities	5,711	5,598
Redeemable Noncontrolling Interest	44	43
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	1,821	1,822
Retained earnings (accumulated deficit)	640	657
Accumulated other comprehensive income (loss)	5	4
Total common stockholders' equity	2,466	2,483
Noncontrolling Interests, Total	778	781
Total Stockholders' Equity	3,244	3,264
Total Liabilities and Stockholders' Equity	$ 8,999	$ 8,905