Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities:
Net income (loss)	$ 497	$ 525
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	639	578
Deferred income taxes	(4)	113
Allowance for equity funds used during construction	(53)	(63)
Stock based compensation expense	58	56
Estimated loss on Kemper IGCC	53	9
Other, net	(13)	4
Changes in certain current assets and liabilities —
-Receivables	235	180
-Fossil fuel stock	31	76
-Materials and supplies	(14)	4
-Other current assets	(90)	(89)
-Accounts payable	(72)	(426)
-Accrued taxes	(60)	197
-Accrued compensation	(332)	(381)
-Retail fuel cost over recovery - short-term	25	49
-Mirror CWIP	0	40
-Other current liabilities	(35)	41
Net cash provided from (used for) operating activities	865	913
Investing Activities:
Plant acquisitions	(114)	(6)
Property additions	(1,872)	(1,091)
Investment in restricted cash	(289)	0
Distributions of restricted cash	292	0
Nuclear decommissioning trust fund purchases	(316)	(290)
Nuclear decommissioning trust fund sales	311	284
Cost of removal, net of salvage	(52)	(36)
Change in construction payables	(94)	65
Prepaid long-term service agreement	(49)	(37)
Other investing activities	(14)	4
Net cash used for investing activities	(2,197)	(1,107)
Financing Activities:
Increase (decrease) in notes payable, net	294	597
Proceeds —
Long-term debt issuances	1,997	550
Common stock issuances	270	112
Short-term borrowings	0	280
Redemptions and repurchases —
Long-term debt	(888)	(333)
Common stock	0	(115)
Short-term borrowings	(475)	0
Capital contributions from noncontrolling interests	131	0
Purchase of membership interests from noncontrolling interests	(4)	0
Purchase of Membership Interests from Noncontrolling Interests	(129)	0
Payment of common stock dividends	(497)	(478)
Other financing activities	(17)	(17)
Net cash provided from (used for) financing activities	682	596
Net Change in Cash and Cash Equivalents	(650)	402
Cash and Cash Equivalents at Beginning of Period	1,404	710
Cash and Cash Equivalents at End of Period	754	1,112
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	224	207
Income taxes, net	(141)	(289)
Noncash transactions - Accrued property additions at end of period	731	347
Alabama Power [Member]
Operating Activities:
Net income (loss)	159	179
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	211	196
Deferred income taxes	68	16
Allowance for equity funds used during construction	(10)	(15)
Other, net	(3)	2
Changes in certain current assets and liabilities —
-Receivables	191	(3)
-Fossil fuel stock	(27)	0
-Materials and supplies	(8)	12
-Other current assets	(79)	(80)
-Accounts payable	(143)	(229)
-Accrued taxes	64	246
-Accrued compensation	(75)	(89)
-Retail fuel cost over recovery - short-term	(1)	34
-Other current liabilities	(8)	21
Net cash provided from (used for) operating activities	339	290
Investing Activities:
Property additions	(313)	(325)
Nuclear decommissioning trust fund purchases	(105)	(129)
Nuclear decommissioning trust fund sales	105	129
Cost of removal, net of salvage	(31)	(13)
Change in construction payables	(15)	34
Other investing activities	(9)	(9)
Net cash used for investing activities	(368)	(313)
Proceeds —
Senior notes issuances	400	550
Capital contributions from parent company	236	6
Other long-term debt	45	0
Redemptions and repurchases —
Senior notes	(200)	(250)
Payment of common stock dividends	(191)	(143)
Other financing activities	(11)	(18)
Net cash provided from (used for) financing activities	279	145
Net Change in Cash and Cash Equivalents	250	122
Cash and Cash Equivalents at Beginning of Period	194	273
Cash and Cash Equivalents at End of Period	444	395
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	76	68
Income taxes, net	(162)	(136)
Noncash transactions - Accrued property additions at end of period	106	41
Georgia Power [Member]
Operating Activities:
Net income (loss)	272	240
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	261	256
Deferred income taxes	55	(7)
Allowance for equity funds used during construction	(14)	(15)
Deferred expenses	38	33
Other, net	(9)	4
Changes in certain current assets and liabilities —
-Receivables	155	166
-Fossil fuel stock	36	67
-Prepaid income taxes	38	170
-Other current assets	12	(13)
-Accounts payable	4	(261)
-Accrued taxes	(235)	(217)
-Accrued compensation	(66)	(81)
-Other current liabilities	16	21
Net cash provided from (used for) operating activities	563	363
Investing Activities:
Property additions	(553)	(422)
Nuclear decommissioning trust fund purchases	(211)	(161)
Nuclear decommissioning trust fund sales	206	155
Cost of removal, net of salvage	(15)	(16)
Change in construction payables, net of joint owner portion	(101)	37
Prepaid long-term service agreement	(11)	(9)
Other investing activities	(4)	11
Net cash used for investing activities	(689)	(405)
Financing Activities:
Increase (decrease) in notes payable, net	(158)	434
Proceeds —
Senior notes issuances	650	0
Capital contributions from parent company	218	11
Short-term borrowings	0	250
Redemptions and repurchases —
Pollution control revenue bonds	(4)	0
Senior notes	(250)	0
Payment of common stock dividends	(326)	(259)
Other financing activities	(11)	(5)
Net cash provided from (used for) financing activities	119	431
Net Change in Cash and Cash Equivalents	(7)	389
Cash and Cash Equivalents at Beginning of Period	67	24
Cash and Cash Equivalents at End of Period	60	413
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	86	79
Income taxes, net	(88)	(34)
Noncash transactions - Accrued property additions at end of period	290	177
Gulf Power [Member]
Operating Activities:
Net income (loss)	31	39
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	40	22
Deferred income taxes	9	27
Allowance for equity funds used during construction	0	(4)
Other, net	(2)	11
Changes in certain current assets and liabilities —
-Receivables	35	12
-Fossil fuel stock	15	(2)
-Other current assets	2	5
-Accounts payable	(6)	(28)
-Accrued taxes	13	5
-Accrued compensation	(18)	(16)
-Other current liabilities	13	10
Net cash provided from (used for) operating activities	132	81
Investing Activities:
Property additions	(32)	(84)
Cost of removal, net of salvage	(2)	(5)
Change in construction payables	(6)	(1)
Other investing activities	(2)	(2)
Net cash used for investing activities	(42)	(92)
Financing Activities:
Increase (decrease) in notes payable, net	(85)	40
Proceeds —
Common stock issuances	0	20
Redemptions and repurchases —
Payment of common stock dividends	(30)	(33)
Other financing activities	(1)	0
Net cash provided from (used for) financing activities	(116)	27
Net Change in Cash and Cash Equivalents	(26)	16
Cash and Cash Equivalents at Beginning of Period	74	39
Cash and Cash Equivalents at End of Period	48	55
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	3	3
Income taxes, net	(25)	(8)
Noncash transactions - Accrued property additions at end of period	15	41
Mississippi Power [Member]
Operating Activities:
Net income (loss)	11	35
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	39	26
Deferred income taxes	(4)	141
Allowance for equity funds used during construction	(29)	(28)
Regulatory assets associated with Kemper IGCC	(6)	(27)
Estimated loss on Kemper IGCC	53	9
Other, net	1	11
Changes in certain current assets and liabilities —
-Receivables	45	17
-Fossil fuel stock	6	4
-Prepaid income taxes	(3)	44
-Other current assets	(5)	(3)
-Accounts payable	(22)	(22)
-Accrued taxes	(61)	(54)
-Accrued interest	2	9
-Accrued compensation	(16)	(20)
-Over recovered regulatory clause revenues	9	22
-Mirror CWIP	0	40
-Customer liability associated with Kemper refunds	(51)	0
-Other current liabilities	6	0
Net cash provided from (used for) operating activities	(25)	204
Investing Activities:
Property additions	(197)	(213)
Change in construction payables	(7)	(14)
Other investing activities	(10)	(6)
Net cash used for investing activities	(214)	(233)
Proceeds —
Capital contributions from parent company	1	76
Short-term borrowings	0	30
Long-term debt issuance to parent company	200	0
Other long-term debt	900	0
Redemptions and repurchases —
Short-term borrowings	(475)	0
Other long-term debt	(425)	(75)
Other financing activities	(2)	(1)
Net cash provided from (used for) financing activities	199	30
Net Change in Cash and Cash Equivalents	(40)	1
Cash and Cash Equivalents at Beginning of Period	98	133
Cash and Cash Equivalents at End of Period	58	134
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	12	(1)
Income taxes, net	(24)	(180)
Noncash transactions - Accrued property additions at end of period	97	100
Southern Power [Member]
Operating Activities:
Net income (loss)	51	33
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	75	60
Deferred income taxes	(132)	(54)
Amortization of investment tax credits	(7)	(4)
Deferred revenues	(26)	(20)
Other, net	9	3
Changes in certain current assets and liabilities —
-Receivables	(3)	2
-Fossil fuel stock	1	6
-Prepaid income taxes	(31)	(2)
-Accounts payable	(12)	(25)
-Accrued taxes	(37)	(4)
-Accrued interest	2	(15)
-Other current liabilities	0	1
Net cash provided from (used for) operating activities	(110)	(19)
Investing Activities:
Plant acquisitions	(114)	(6)
Property additions	(767)	(33)
Investment in restricted cash	(289)	0
Distributions of restricted cash	292	0
Change in construction payables	31	17
Payments pursuant to long-term service agreements	(25)	(16)
Other investing activities	(1)	0
Net cash used for investing activities	(873)	(38)
Financing Activities:
Increase (decrease) in notes payable, net	276	38
Redemptions and repurchases —
Capital contributions from noncontrolling interests	131	0
Purchase of membership interests from noncontrolling interests	(4)	0
Purchase of Membership Interests from Noncontrolling Interests	(129)	0
Payment of common stock dividends	(68)	(33)
Net cash provided from (used for) financing activities	206	5
Net Change in Cash and Cash Equivalents	(777)	(52)
Cash and Cash Equivalents at Beginning of Period	830	75
Cash and Cash Equivalents at End of Period	53	23
Cash paid (received) during the period for --
Interest (net of capitalized amounts)	15	36
Income taxes, net	188	79
Noncash transactions - Accrued property additions at end of period	$ 262	$ 16