Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net Income	$ 427,000,000	$ 2,324,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	2,564,000,000	2,109,000,000
Deferred income taxes	15,000,000	(22,000,000)
Allowance for equity funds used during construction	(133,000,000)	(150,000,000)
Pension, postretirement, and other employee benefits	(64,000,000)	(158,000,000)
Settlement of asset retirement obligations	(137,000,000)	(117,000,000)
Hedge settlements	0	(236,000,000)
Estimated loss on Kemper IGCC	3,148,000,000	222,000,000
Other, net	(8,000,000)	(1,000,000)
Changes in certain current assets and liabilities —
-Receivables	426,000,000	(458,000,000)
-Fossil fuel stock	59,000,000	204,000,000
-Natural gas for sale, net of temporary LIFO liquidation	0	(222,000,000)
-Other current assets	(164,000,000)	(112,000,000)
-Accounts payable	(467,000,000)	(9,000,000)
-Accrued taxes	157,000,000	1,062,000,000
-Accrued compensation	(230,000,000)	(122,000,000)
-Retail fuel cost over recovery	(211,000,000)	(106,000,000)
-Other current liabilities	(129,000,000)	88,000,000
Net cash provided from operating activities	5,253,000,000	4,296,000,000
Investing Activities:
Business acquisitions, net of cash acquired	(1,032,000,000)	(9,513,000,000)
Property additions	(5,242,000,000)	(5,252,000,000)
Investment in restricted cash	(16,000,000)	(750,000,000)
Distribution of restricted cash	33,000,000	746,000,000
Nuclear decommissioning trust fund purchases	(585,000,000)	(838,000,000)
Nuclear decommissioning trust fund sales	580,000,000	832,000,000
Cost of removal, net of salvage	(208,000,000)	(155,000,000)
Change in construction payables, net	120,000,000	(259,000,000)
Investment in unconsolidated subsidiaries	(134,000,000)	(1,421,000,000)
Payments pursuant to LTSAs	(189,000,000)	(125,000,000)
Other investing activities	(14,000,000)	95,000,000
Net cash used for investing activities	(6,687,000,000)	(16,640,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(515,000,000)	655,000,000
Proceeds —
Long-term debt	4,068,000,000	14,091,000,000
Common stock	613,000,000	3,265,000,000
Preferred stock	250,000,000	0
Short-term borrowings	1,263,000,000	0
Redemptions and repurchases —
Long-term debt	(1,981,000,000)	(2,405,000,000)
Preferred and preference stock	(150,000,000)	0
Short-term borrowings	(409,000,000)	(475,000,000)
Distributions to noncontrolling interests	(89,000,000)	(22,000,000)
Capital contributions from noncontrolling interests	79,000,000	367,000,000
Purchase of membership interests from noncontrolling interests	0	(129,000,000)
Payment of common stock dividends	(1,716,000,000)	(1,553,000,000)
Other financing activities	(113,000,000)	(185,000,000)
Net cash provided from financing activities	1,300,000,000	13,609,000,000
Net Change in Cash and Cash Equivalents	(134,000,000)	1,265,000,000
Cash and Cash Equivalents at Beginning of Period	1,975,000,000	1,404,000,000
Cash and Cash Equivalents at End of Period	1,841,000,000	2,669,000,000
Cash paid (received) during the period for —
Interest	1,286,000,000	766,000,000
Income taxes, net	(187,000,000)	(151,000,000)
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	805,000,000	578,000,000
ALABAMA POWER CO
Operating Activities:
Net Income	743,000,000	734,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	666,000,000	634,000,000
Deferred income taxes	260,000,000	267,000,000
Allowance for equity funds used during construction	(27,000,000)	(23,000,000)
Pension, postretirement, and other employee benefits	(4,000,000)	(14,000,000)
Other, net	43,000,000	(12,000,000)
Changes in certain current assets and liabilities —
-Receivables	(163,000,000)	(4,000,000)
-Fossil fuel stock	34,000,000	18,000,000
-Other current assets	(58,000,000)	(46,000,000)
-Accounts payable	(125,000,000)	(113,000,000)
-Accrued taxes	159,000,000	207,000,000
-Accrued compensation	(48,000,000)	(22,000,000)
-Retail fuel cost over recovery	(76,000,000)	(104,000,000)
-Other current liabilities	7,000,000	19,000,000
Net cash provided from operating activities	1,411,000,000	1,541,000,000
Investing Activities:
Property additions	(1,211,000,000)	(947,000,000)
Nuclear decommissioning trust fund purchases	(174,000,000)	(275,000,000)
Nuclear decommissioning trust fund sales	174,000,000	275,000,000
Cost of removal, net of salvage	(82,000,000)	(70,000,000)
Change in construction payables, net	105,000,000	(37,000,000)
Other investing activities	(29,000,000)	(28,000,000)
Net cash used for investing activities	(1,217,000,000)	(1,082,000,000)
Proceeds —
Senior notes	550,000,000	400,000,000
Capital contributions from parent company	337,000,000	253,000,000
Preferred stock	250,000,000	0
Other long-term debt	0	45,000,000
Redemptions and repurchases —
Pollution control revenue bonds	(36,000,000)	0
Senior notes	(200,000,000)	(200,000,000)
Payment of common stock dividends	(536,000,000)	(574,000,000)
Other financing activities	(26,000,000)	(21,000,000)
Net cash provided from financing activities	339,000,000	(97,000,000)
Net Change in Cash and Cash Equivalents	533,000,000	362,000,000
Cash and Cash Equivalents at Beginning of Period	420,000,000	194,000,000
Cash and Cash Equivalents at End of Period	953,000,000	556,000,000
Cash paid (received) during the period for —
Interest	217,000,000	215,000,000
Income taxes, net	146,000,000	(70,000,000)
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	189,000,000	84,000,000
GEORGIA POWER CO
Operating Activities:
Net Income	1,201,000,000	1,230,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	821,000,000	794,000,000
Deferred income taxes	328,000,000	346,000,000
Allowance for equity funds used during construction	(29,000,000)	(36,000,000)
Deferred expenses	(30,000,000)	(40,000,000)
Pension, postretirement, and other employee benefits	(42,000,000)	(14,000,000)
Settlement of asset retirement obligations	(95,000,000)	(93,000,000)
Other, net	(21,000,000)	7,000,000
Changes in certain current assets and liabilities —
-Receivables	(254,000,000)	(162,000,000)
-Fossil fuel stock	(2,000,000)	128,000,000
-Other current assets	(29,000,000)	62,000,000
-Accounts payable	(161,000,000)	39,000,000
-Accrued taxes	(52,000,000)	(22,000,000)
-Accrued compensation	(60,000,000)	(26,000,000)
-Retail fuel cost over recovery	(84,000,000)	9,000,000
-Other current liabilities	(11,000,000)	44,000,000
Net cash provided from operating activities	1,480,000,000	2,266,000,000
Investing Activities:
Property additions	(1,907,000,000)	(1,566,000,000)
Nuclear decommissioning trust fund purchases	(411,000,000)	(563,000,000)
Nuclear decommissioning trust fund sales	406,000,000	558,000,000
Cost of removal, net of salvage	(54,000,000)	(45,000,000)
Change in construction payables, net of joint owner portion	180,000,000	(139,000,000)
Payments pursuant to LTSAs	(59,000,000)	(27,000,000)
Sale of property	63,000,000	10,000,000
Other investing activities	(52,000,000)	14,000,000
Net cash used for investing activities	(1,834,000,000)	(1,758,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(391,000,000)	(63,000,000)
Proceeds —
Senior notes	1,350,000,000	650,000,000
FFB loan	0	300,000,000
Capital contributions from parent company	412,000,000	294,000,000
Short-term borrowings	700,000,000	0
Other long-term debt	370,000,000	0
Redemptions and repurchases —
Pollution control revenue bonds	(65,000,000)	(4,000,000)
Senior notes	(450,000,000)	(700,000,000)
Short-term borrowings	(300,000,000)	0
Payment of common stock dividends	(961,000,000)	(979,000,000)
Other financing activities	(48,000,000)	(26,000,000)
Net cash provided from financing activities	617,000,000	(528,000,000)
Net Change in Cash and Cash Equivalents	263,000,000	(20,000,000)
Cash and Cash Equivalents at Beginning of Period	3,000,000	67,000,000
Cash and Cash Equivalents at End of Period	266,000,000	47,000,000
Cash paid (received) during the period for —
Interest	284,000,000	277,000,000
Income taxes, net	369,000,000	188,000,000
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	470,000,000	226,000,000
GULF POWER CO
Operating Activities:
Net Income	121,000,000	115,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	100,000,000	134,000,000
Deferred income taxes	57,000,000	15,000,000
Loss on Plant Scherer Unit 3	33,000,000	0
Other, net	(5,000,000)	(2,000,000)
Changes in certain current assets and liabilities —
-Receivables	(65,000,000)	(9,000,000)
-Fossil fuel stock	7,000,000	49,000,000
-Other current assets	11,000,000	3,000,000
-Accrued taxes	21,000,000	40,000,000
-Accrued compensation	(10,000,000)	(5,000,000)
-Over recovered regulatory clause revenues	(8,000,000)	26,000,000
-Other current liabilities	10,000,000	8,000,000
Net cash provided from operating activities	272,000,000	374,000,000
Investing Activities:
Property additions	(142,000,000)	(106,000,000)
Cost of removal, net of salvage	(16,000,000)	(8,000,000)
Change in construction payables, net	(9,000,000)	(7,000,000)
Other investing activities	(6,000,000)	(6,000,000)
Net cash used for investing activities	(173,000,000)	(127,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(268,000,000)	(42,000,000)
Proceeds —
Senior notes	300,000,000	0
Capital contributions from parent company	7,000,000	10,000,000
Common stock	175,000,000	0
Redemptions and repurchases —
Preferred and preference stock	(150,000,000)	0
Senior notes	(85,000,000)	(125,000,000)
Payment of common stock dividends	(94,000,000)	(90,000,000)
Other financing activities	(3,000,000)	(5,000,000)
Net cash provided from financing activities	(118,000,000)	(252,000,000)
Net Change in Cash and Cash Equivalents	(19,000,000)	(5,000,000)
Cash and Cash Equivalents at Beginning of Period	56,000,000	74,000,000
Cash and Cash Equivalents at End of Period	37,000,000	69,000,000
Cash paid (received) during the period for —
Interest	24,000,000	29,000,000
Income taxes, net	19,000,000	14,000,000
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	25,000,000	13,000,000
MISSISSIPPI POWER CO
Operating Activities:
Net Income	(2,033,000,000)	40,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	144,000,000	115,000,000
Deferred income taxes	(1,159,000,000)	34,000,000
Allowance for equity funds used during construction	(72,000,000)	(90,000,000)
Estimated loss on Kemper IGCC	3,148,000,000	222,000,000
Other, net	(26,000,000)	(1,000,000)
Changes in certain current assets and liabilities —
-Receivables	438,000,000	3,000,000
-Fossil fuel stock	21,000,000	8,000,000
-Other current assets	(9,000,000)	34,000,000
-Accounts payable	(21,000,000)	5,000,000
-Accrued taxes	20,000,000	96,000,000
-Accrued compensation	(12,000,000)	(5,000,000)
-Over recovered regulatory clause revenues	(47,000,000)	(20,000,000)
-Customer liability associated with Kemper refunds	0	(73,000,000)
-Other current liabilities	(31,000,000)	5,000,000
Net cash provided from operating activities	361,000,000	373,000,000
Investing Activities:
Property additions	(411,000,000)	(592,000,000)
Change in construction payables, net	(47,000,000)	(25,000,000)
Government grant proceeds	0	137,000,000
Other investing activities	(25,000,000)	(29,000,000)
Net cash used for investing activities	(483,000,000)	(509,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(23,000,000)	0
Proceeds —
Capital contributions from parent company	1,002,000,000	227,000,000
Short-term borrowings	113,000,000	0
Long-term debt to parent company	40,000,000	200,000,000
Other long-term debt	0	900,000,000
Redemptions and repurchases —
Short-term borrowings	(109,000,000)	(475,000,000)
Long-term debt to parent company	(591,000,000)	(225,000,000)
Other long-term debt	(300,000,000)	(425,000,000)
Other financing activities	(3,000,000)	(5,000,000)
Net cash provided from financing activities	129,000,000	197,000,000
Net Change in Cash and Cash Equivalents	7,000,000	61,000,000
Cash and Cash Equivalents at Beginning of Period	224,000,000	98,000,000
Cash and Cash Equivalents at End of Period	231,000,000	159,000,000
Cash paid (received) during the period for —
Interest	45,000,000	36,000,000
Income taxes, net	(209,000,000)	(231,000,000)
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	32,000,000	80,000,000
SOUTHERN POWER CO
Operating Activities:
Net Income	324,000,000	354,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	404,000,000	262,000,000
Deferred income taxes	240,000,000	(668,000,000)
Amortization of investment tax credits	(42,000,000)	(25,000,000)
Collateral deposits	(1,000,000)	(80,000,000)
Income taxes receivable, non-current	(42,000,000)	0
Other, net	(2,000,000)	19,000,000
Changes in certain current assets and liabilities —
-Receivables	(77,000,000)	(82,000,000)
-Other current assets	38,000,000	(15,000,000)
-Accounts payable	(31,000,000)	7,000,000
-Accrued taxes	79,000,000	483,000,000
-Other current liabilities	5,000,000	14,000,000
Net cash provided from operating activities	895,000,000	269,000,000
Investing Activities:
Business acquisitions, net of cash acquired	(1,032,000,000)	(1,134,000,000)
Property additions	(218,000,000)	(1,702,000,000)
Investment in restricted cash	(16,000,000)	(750,000,000)
Distribution of restricted cash	33,000,000	746,000,000
Change in construction payables, net	(166,000,000)	(69,000,000)
Payments pursuant to LTSAs	(99,000,000)	(58,000,000)
Other investing activities	7,000,000	(41,000,000)
Net cash used for investing activities	(1,491,000,000)	(3,008,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(89,000,000)	692,000,000
Proceeds —
Senior notes	0	1,531,000,000
Capital contributions from parent company	0	800,000,000
Other long-term debt	43,000,000	63,000,000
Redemptions and repurchases —
Other long-term debt	(4,000,000)	(84,000,000)
Distributions to noncontrolling interests	(89,000,000)	(22,000,000)
Capital contributions from noncontrolling interests	79,000,000	367,000,000
Purchase of membership interests from noncontrolling interests	0	(129,000,000)
Payment of common stock dividends	(238,000,000)	(204,000,000)
Other financing activities	(27,000,000)	(14,000,000)
Net cash provided from financing activities	(325,000,000)	3,000,000,000
Net Change in Cash and Cash Equivalents	(921,000,000)	261,000,000
Cash and Cash Equivalents at Beginning of Period	1,099,000,000	830,000,000
Cash and Cash Equivalents at End of Period	178,000,000	1,091,000,000
Cash paid (received) during the period for —
Interest	144,000,000	49,000,000
Income taxes, net	(343,000,000)	71,000,000
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	16,000,000	210,000,000
SOUTHERN Co GAS
Operating Activities:
Net Income	303,000,000
Adjustments to reconcile consolidated net income to net cash provided from operating activities —
Depreciation and amortization, total	370,000,000
Deferred income taxes	265,000,000
Pension, postretirement, and other employee benefits	(4,000,000)
Stock based compensation expense	25,000,000
Hedge settlements	0
Mark-to-market adjustments	(32,000,000)
Other, net	(67,000,000)
Changes in certain current assets and liabilities —
-Receivables	534,000,000
-Natural gas for sale, net of temporary LIFO liquidation	0
-Prepaid income taxes	(7,000,000)
-Other current assets	(42,000,000)
-Accounts payable	(169,000,000)
-Accrued taxes	(24,000,000)
-Accrued compensation	(11,000,000)
-Other current liabilities	8,000,000
Net cash provided from operating activities	1,149,000,000
Investing Activities:
Property additions	(1,093,000,000)
Cost of removal, net of salvage	(45,000,000)
Change in construction payables, net	49,000,000
Investment in unconsolidated subsidiaries	(128,000,000)
Returned investment in unconsolidated subsidiaries	22,000,000
Other investing activities	3,000,000
Net cash used for investing activities	(1,192,000,000)
Financing Activities:
Increase (decrease) in notes payable, net	(323,000,000)
First mortgage bonds	0
Proceeds —
First mortgage bonds	200,000,000
Senior notes	450,000,000
Capital contributions from parent company	79,000,000
Redemptions and repurchases —
Long-term debt	(22,000,000)
Senior notes	0
Distributions to noncontrolling interests	0
Payment of common stock dividends	(332,000,000)
Other financing activities	(7,000,000)
Net cash provided from financing activities	45,000,000
Net Change in Cash and Cash Equivalents	2,000,000
Cash and Cash Equivalents at Beginning of Period	19,000,000
Cash and Cash Equivalents at End of Period	21,000,000	48,000,000
Cash paid (received) during the period for —
Interest	146,000,000
Income taxes, net	17,000,000
Noncash Investing and Financing Items [Abstract]
Noncash transactions — Accrued property additions at end of period	$ 112,000,000
Predecessor \| SOUTHERN Co GAS
Redemptions and repurchases —
Cash and Cash Equivalents at Beginning of Period		$ 19,000,000

Amortization of deferred investment tax credits.

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Cash paid received during period.

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Estimated Loss On Integrated Coal Gasification Combined Cycle Project, Non-Cash

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Federal Financing Bank Loan

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Government grant proceeds

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The cash outflow (inflow) for a financial contract that settles in the period relating to operating activities.

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The net change during the period in the amount of cash payments due to taxing authorities for income and non income-related taxes.

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Increase decrease retail fuel cost over recovery short-term.

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Increase (Decrease) in Energy Related Inventory, Natural Gas in Storage

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Increase (Decrease) in Refunds Related to Integrated Coal Gassification Combined Cycle Project

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The cash inflow to the parent company associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes proceeds from (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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Long-term Debt Redemption To Parent Company

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Loss on Power Plant Unit

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Payments for investment in restricted cash.

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Payments pursuant to long-term service agreements.

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Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from issuance of long-term debt classified as other.

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

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The cash outflow from the repayment of a long-term debt instrument issued, secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default.

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