Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 2,669	$ 1,404
Receivables —
Customer accounts receivable	1,718	1,058
Energy marketing receivable	526	0
Unbilled revenues	639	397
Under recovered regulatory clause revenues	54	63
Income taxes receivable, current	0	144
Other accounts and notes receivable	317	398
Accumulated provision for uncollectible accounts	(43)	(13)
Materials and supplies	1,268	1,061
Fossil fuel stock	664	868
Natural gas for sale	627	0
Vacation pay	178	178
Prepaid expenses	459	495
Other regulatory assets, current	414	402
Other current assets	168	71
Total current assets	9,658	6,526
Property, Plant, and Equipment:
In service	94,174	75,118
Less accumulated provision for depreciation	29,590	24,253
Plant in service, net of depreciation	64,584	50,865
Other utility plant, net	0	233
Nuclear fuel, at amortized cost	901	934
Construction work in progress	10,069	9,082
Total property, plant, and equipment	75,554	61,114
Other Property and Investments:
Goodwill	6,223	2
Equity investments in unconsolidated subsidiaries	1,541	6
Other intangible assets, net of amortization	942	317
Nuclear decommissioning trusts, at fair value	1,616	1,512
Leveraged leases	769	755
Miscellaneous property and investments	249	160
Total other property and investments	11,340	2,752
Deferred Charges and Other Assets:
Deferred charges related to income taxes	1,590	1,560
Unamortized loss on reacquired debt	228	227
Other regulatory assets, deferred	6,446	4,989
Income taxes receivable, non-current	413	413
Other deferred charges and assets -- non-affiliated	1,133	737
Total deferred charges and other assets	9,810	7,926
Total Assets	106,362	78,318
Current Liabilities:
Securities due within one year	2,254	2,674
Notes payable	1,670	1,376
Energy marketing trade payables	533	0
Accounts payable —
Accounts payable	1,732	1,905
Customer deposits	577	404
Accrued taxes —
Accrued income taxes	375	19
Other accrued taxes	641	484
Accrued interest	410	249
Accrued vacation pay	231	228
Accrued compensation	505	549
Asset retirement obligations, current	390	217
Liabilities from risk management activities	125	156
Other regulatory liabilities, current	99	278
Mandatorily redeemable noncontrolling interest	174	0
Other current liabilities	851	590
Total current liabilities	10,567	9,129
Long-term Debt:
Total Long-term Debt	41,550	24,688
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	14,218	12,322
Deferred credits related to income taxes	204	187
Accumulated deferred investment tax credits	1,721	1,219
Employee benefit obligations	3,022	2,582
Asset retirement obligations, deferred	4,124	3,542
Accrued Environmental Loss Contingencies, Noncurrent	415	42
Unrecognized tax benefits	381	370
Other cost of removal obligations	2,771	1,162
Other regulatory liabilities, deferred	401	254
Other deferred credits and liabilities	641	678
Total deferred credits and other liabilities	27,898	22,358
Total Liabilities	80,015	56,175
Redeemable Preferred Stock of Subsidiaries	118	118
Redeemable Noncontrolling Interest	49	43
Common Stockholders' Equity:
Common stock	4,900	4,572
Paid-in capital	9,217	6,282
Treasury, at cost	(30)	(142)
Retained earnings (accumulated deficit)	10,685	10,010
Accumulated other comprehensive income (loss)	(225)	(130)
Total common stockholders' equity	24,547	20,592
Preferred and Preference Stock of Subsidiaries	609	609
Noncontrolling Interests	1,024	781
Total Stockholders' Equity	26,180	21,982
Total Liabilities and Stockholders' Equity	106,362	78,318
Alabama Power [Member]
Current Assets:
Cash and cash equivalents	556	194
Receivables —
Customer accounts receivable	440	332
Unbilled revenues	155	119
Under recovered regulatory clause revenues	52	43
Income taxes receivable, current	0	142
Other accounts and notes receivable	43	20
Affiliated	30	50
Accumulated provision for uncollectible accounts	(9)	(10)
Materials and supplies	420	398
Fossil fuel stock	220	239
Vacation pay	66	66
Prepaid expenses	56	83
Other regulatory assets, current	73	115
Other current assets	9	10
Total current assets	2,111	1,801
Property, Plant, and Equipment:
In service	25,800	24,750
Less accumulated provision for depreciation	9,018	8,736
Plant in service, net of depreciation	16,782	16,014
Nuclear fuel, at amortized cost	345	363
Construction work in progress	473	801
Total property, plant, and equipment	17,600	17,178
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	67	71
Nuclear decommissioning trusts, at fair value	781	737
Miscellaneous property and investments	105	96
Total other property and investments	953	904
Deferred Charges and Other Assets:
Deferred charges related to income taxes	518	522
Deferred under recovered regulatory clause revenues	87	99
Other regulatory assets, deferred	1,070	1,114
Other deferred charges and assets -- non-affiliated	118	103
Total deferred charges and other assets	1,793	1,838
Total Assets	22,457	21,721
Current Liabilities:
Securities due within one year	236	200
Accounts payable —
Affiliated	309	278
Other	233	410
Customer deposits	88	88
Accrued taxes —
Accrued income taxes	73	0
Other accrued taxes	125	38
Accrued interest	69	73
Accrued vacation pay	55	55
Accrued compensation	97	119
Liabilities from risk management activities	10	55
Other regulatory liabilities, current	1	240
Other current liabilities	65	39
Total current liabilities	1,361	1,595
Long-term Debt:
Total Long-term Debt	6,859	6,654
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,505	4,241
Deferred credits related to income taxes	67	70
Accumulated deferred investment tax credits	112	118
Employee benefit obligations	366	388
Asset retirement obligations, deferred	1,501	1,448
Other cost of removal obligations	695	722
Other regulatory liabilities, deferred	95	136
Deferred over recovered regulatory clause revenues	157	0
Other deferred credits and liabilities	56	76
Total deferred credits and other liabilities	7,554	7,199
Total Liabilities	15,774	15,448
Redeemable Preferred Stock	85	85
Preference Stock	196	196
Common Stockholders' Equity:
Common stock	1,222	1,222
Paid-in capital	2,607	2,341
Retained earnings (accumulated deficit)	2,604	2,461
Accumulated other comprehensive income (loss)	(31)	(32)
Total common stockholders' equity	6,402	5,992
Total Liabilities and Stockholders' Equity	22,457	21,721
Georgia Power [Member]
Current Assets:
Cash and cash equivalents	47	67
Receivables —
Customer accounts receivable	718	541
Unbilled revenues	298	188
Joint owner accounts receivable	46	227
Income taxes receivable, current	0	114
Other accounts and notes receivable	55	57
Affiliated	15	18
Accumulated provision for uncollectible accounts	(2)	(2)
Materials and supplies	470	449
Fossil fuel stock	274	402
Vacation pay	90	91
Prepaid income taxes	111	156
Other regulatory assets, current	115	123
Other current assets	89	92
Total current assets	2,326	2,523
Property, Plant, and Equipment:
In service	33,394	31,841
Less accumulated provision for depreciation	11,234	10,903
Plant in service, net of depreciation	22,160	20,938
Other utility plant, net	0	171
Nuclear fuel, at amortized cost	556	572
Construction work in progress	4,888	4,775
Total property, plant, and equipment	27,604	26,456
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	61	64
Nuclear decommissioning trusts, at fair value	835	775
Miscellaneous property and investments	42	43
Total other property and investments	938	882
Deferred Charges and Other Assets:
Deferred charges related to income taxes	675	679
Other regulatory assets, deferred	2,530	2,152
Other deferred charges and assets -- non-affiliated	175	173
Total deferred charges and other assets	3,380	3,004
Total Assets	34,248	32,865
Current Liabilities:
Securities due within one year	458	712
Notes payable	95	158
Accounts payable —
Affiliated	451	411
Other	464	750
Customer deposits	265	264
Accrued taxes —
Accrued income taxes	14	12
Other accrued taxes	310	325
Accrued interest	110	99
Accrued vacation pay	62	62
Accrued compensation	118	142
Asset retirement obligations, current	313	179
Over recovered regulatory clause revenues, current	125	10
Other current liabilities	197	171
Total current liabilities	2,982	3,295
Long-term Debt:
Total Long-term Debt	10,114	9,616
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	5,969	5,627
Deferred credits related to income taxes	103	105
Accumulated deferred investment tax credits	199	204
Employee benefit obligations	906	949
Asset retirement obligations, deferred	2,241	1,737
Other deferred credits and liabilities	203	347
Total deferred credits and other liabilities	9,621	8,969
Total Liabilities	22,717	21,880
Redeemable Preferred Stock	45	45
Preference Stock	221	221
Common Stockholders' Equity:
Common stock	398	398
Paid-in capital	6,585	6,275
Retained earnings (accumulated deficit)	4,295	4,061
Accumulated other comprehensive income (loss)	(13)	(15)
Total common stockholders' equity	11,265	10,719
Total Liabilities and Stockholders' Equity	34,248	32,865
Gulf Power [Member]
Current Assets:
Cash and cash equivalents	69	74
Receivables —
Customer accounts receivable	94	76
Unbilled revenues	74	54
Under recovered regulatory clause revenues	2	20
Income taxes receivable, current	0	27
Other accounts and notes receivable	4	9
Affiliated	3	1
Accumulated provision for uncollectible accounts	(1)	(1)
Materials and supplies	56	56
Fossil fuel stock	59	108
Other regulatory assets, current	62	90
Other current assets	15	22
Total current assets	437	536
Property, Plant, and Equipment:
In service	5,073	5,045
Less accumulated provision for depreciation	1,387	1,296
Plant in service, net of depreciation	3,686	3,749
Other utility plant, net	0	62
Construction work in progress	64	48
Total property, plant, and equipment	3,750	3,859
Other Property and Investments:
Total other property and investments	4	4
Deferred Charges and Other Assets:
Deferred charges related to income taxes	59	61
Other regulatory assets, deferred	507	427
Other deferred charges and assets -- non-affiliated	45	33
Total deferred charges and other assets	611	521
Total Assets	4,802	4,920
Current Liabilities:
Securities due within one year	195	110
Notes payable	100	142
Accounts payable —
Affiliated	50	55
Other	41	44
Customer deposits	35	36
Accrued taxes —
Accrued income taxes	19	4
Other accrued taxes	34	9
Accrued interest	19	9
Accrued compensation	20	25
Deferred capacity expense, current	22	22
Liabilities from risk management activities	30	49
Other regulatory liabilities, current	28	22
Other current liabilities	41	40
Total current liabilities	634	567
Long-term Debt:
Total Long-term Debt	989	1,193
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	904	893
Employee benefit obligations	125	129
Deferred capacity expense	125	141
Asset retirement obligations, deferred	119	113
Accrued Environmental Loss Contingencies, Noncurrent	41	42
Other cost of removal obligations	248	233
Other regulatory liabilities, deferred	48	47
Other deferred credits and liabilities	41	60
Total deferred credits and other liabilities	1,651	1,658
Total Liabilities	3,274	3,418
Preference Stock	147	147
Common Stockholders' Equity:
Common stock	503	503
Paid-in capital	579	567
Retained earnings (accumulated deficit)	303	285
Accumulated other comprehensive income (loss)	(4)	0
Total common stockholders' equity	1,381	1,355
Total Liabilities and Stockholders' Equity	4,802	4,920
Mississippi Power [Member]
Current Assets:
Cash and cash equivalents	159	98
Receivables —
Customer accounts receivable	39	26
Unbilled revenues	47	36
Income taxes receivable, current	0	20
Other accounts and notes receivable	6	10
Affiliated	17	20
Materials and supplies	75	75
Fossil fuel stock	96	104
Prepaid income taxes	0	39
Other regulatory assets, current	118	95
Other current assets	10	8
Total current assets	567	531
Property, Plant, and Equipment:
In service	4,835	4,886
Less accumulated provision for depreciation	1,259	1,262
Plant in service, net of depreciation	3,576	3,624
Construction work in progress	2,525	2,254
Total property, plant, and equipment	6,101	5,878
Other Property and Investments:
Total other property and investments	12	11
Deferred Charges and Other Assets:
Deferred charges related to income taxes	330	290
Other regulatory assets, deferred	510	525
Income taxes receivable, non-current	544	544
Other deferred charges and assets -- non-affiliated	101	61
Total deferred charges and other assets	1,485	1,420
Total Assets	8,165	7,840
Current Liabilities:
Securities due within one year	343	728
Notes payable	25	500
Accounts payable —
Affiliated	92	85
Other	126	135
Customer deposits	16	16
Accrued taxes —
Accrued income taxes	110	0
Other accrued taxes	75	85
Accrued interest	20	18
Accrued compensation	21	26
Asset retirement obligations, current	36	22
Over recovered regulatory clause liabilities	76	96
Customer liability associated with Kemper refunds	1	73
Other current liabilities	37	52
Total current liabilities	978	1,836
Long-term Debt:
Long-term Debt, Affiliated	551	576
Long-term debt, non-affiliated	2,161	1,310
Total Long-term Debt	2,712	1,886
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	823	762
Deferred credits related to income taxes	7	8
Employee benefit obligations	146	153
Asset retirement obligations, deferred	154	154
Unrecognized tax benefits	382	368
Other cost of removal obligations	172	165
Other regulatory liabilities, deferred	76	71
Other deferred credits and liabilities	54	45
Total deferred credits and other liabilities	1,814	1,726
Total Liabilities	5,504	5,448
Redeemable Preferred Stock	33	33
Common Stockholders' Equity:
Common stock	38	38
Paid-in capital	3,124	2,893
Retained earnings (accumulated deficit)	(528)	(566)
Accumulated other comprehensive income (loss)	(6)	(6)
Total common stockholders' equity	2,628	2,359
Total Liabilities and Stockholders' Equity	8,165	7,840
Southern Power [Member]
Current Assets:
Cash and cash equivalents	1,091	830
Receivables —
Customer accounts receivable	121	75
Other accounts and notes receivable	25	19
Affiliated	67	30
Materials and supplies	163	63
Fossil fuel stock	14	16
Prepaid income taxes	61	45
Other current assets	32	30
Total current assets	1,574	1,108
Property, Plant, and Equipment:
In service	9,491	7,275
Less accumulated provision for depreciation	1,465	1,248
Plant in service, net of depreciation	8,026	6,027
Construction work in progress	1,652	1,137
Total property, plant, and equipment	9,678	7,164
Other Property and Investments:
Goodwill	2	2
Other intangible assets, net of amortization	389	317
Total other property and investments	391	319
Deferred Charges and Other Assets:
Prepaid long-term service agreements	151	166
Accumulated deferred income taxes	199	0
Other deferred charges and assets -- affiliated	3	9
Other deferred charges and assets -- non-affiliated	355	139
Total deferred charges and other assets	708	314
Total Assets	12,351	8,905
Current Liabilities:
Securities due within one year	60	403
Notes payable	828	137
Accounts payable —
Affiliated	91	66
Other	218	327
Accrued taxes —
Accrued income taxes	147	198
Other accrued taxes	16	5
Accrued interest	30	23
Business Combination, Contingent Consideration, Liability	30	36
Other current liabilities	97	44
Total current liabilities	1,517	1,239
Long-term Debt:
Total Long-term Debt	4,548	2,719
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	140	601
Accumulated deferred investment tax credits	1,385	889
Accrued income taxes, non-current	109	109
Asset retirement obligations, deferred	40	21
Deferred capacity revenues -- affiliated	19	17
Other deferred credits and liabilities	115	3
Total deferred credits and other liabilities	1,808	1,640
Total Liabilities	7,873	5,598
Redeemable Noncontrolling Interest	49	43
Common Stockholders' Equity:
Common stock	0	0
Paid-in capital	2,620	1,822
Retained earnings (accumulated deficit)	769	657
Accumulated other comprehensive income (loss)	16	4
Total common stockholders' equity	3,405	2,483
Noncontrolling Interests, Total	1,024	781
Total Stockholders' Equity	4,429	3,264
Total Liabilities and Stockholders' Equity	$ 12,351	$ 8,905