Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net income (loss)	$ 809	$ (684)
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	1,750	1,683
Deferred income taxes	(338)	(270)
Allowance for equity funds used during construction	(63)	(115)
Pension, postretirement, and other employee benefits	(74)	(83)
Settlement of asset retirement obligations	(97)	(87)
Stock based compensation expense	83	73
Estimated loss on plants under construction	1,088	3,120
Goodwill impairment	42
Asset impairment	161	0
Other, net	5	(118)
Changes in certain current assets and liabilities —
-Receivables	94	107
-Prepayments	(73)	(61)
-Natural gas for sale, net of temporary LIFO liquidation	295	223
-Other current assets	(40)	(30)
-Accounts payable	(406)	(353)
-Accrued taxes	213	(132)
-Accrued compensation	(284)	(331)
-Retail fuel cost over recovery	10	(187)
-Other current liabilities	125	(14)
Net cash provided from operating activities	3,258	2,741
Investing Activities:
Business acquisitions, net of cash acquired	(64)	(1,046)
Property additions	(3,828)	(3,398)
Nuclear decommissioning trust fund purchases	(571)	(388)
Nuclear decommissioning trust fund sales	566	383
Cost of removal, net of salvage	(128)	(128)
Change in construction payables, net	49	(117)
Investment in unconsolidated subsidiaries	(63)	(116)
Payments pursuant to LTSAs	(103)	(132)
Asset dispositions	500	65
Other investing activities	18	(6)
Net cash used for investing activities	(3,624)	(4,883)
Financing Activities:
Increase (decrease) in notes payable, net	1,442	30
Proceeds —
Long-term debt	1,100	2,958
Short-term borrowings	1,650	1,004
Common stock	222	417
Redemptions and repurchases —
Long-term debt	(3,379)	(1,478)
Preferred and preference stock	0	(150)
Short-term borrowings	(550)	0
Distributions to noncontrolling interests	(42)	(40)
Capital contributions from noncontrolling interests	1,210	73
Payment of common stock dividends	(1,194)	(1,134)
Other financing activities	(223)	(75)
Net cash provided from financing activities	236	1,605
Net Change in Cash, Cash Equivalents, and Restricted Cash	(130)	(537)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,147	1,992
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,017	1,455
Cash paid (received) during the period for —
Interest	927	833
Income taxes, net	4	1
Noncash transactions — Accrued property additions at end of period	1,067	629
ALABAMA POWER CO
Operating Activities:
Net income (loss)	491	412
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	452	442
Deferred income taxes	48	192
Allowance for equity funds used during construction	(27)	(16)
Pension, postretirement, and other employee benefits	(28)	(24)
Other, net	(40)	20
Changes in certain current assets and liabilities —
-Receivables	(153)	(58)
-Prepayments	(57)	(56)
-Materials and supplies	(47)	(18)
-Other current assets	29	12
-Accounts payable	(196)	(154)
-Accrued taxes	134	52
-Accrued compensation	(70)	(74)
-Retail fuel cost over recovery	0	(65)
-Other current liabilities	116	7
Net cash provided from operating activities	652	672
Investing Activities:
Property additions	(997)	(738)
Nuclear decommissioning trust fund purchases	(131)	(117)
Nuclear decommissioning trust fund sales	131	117
Cost of removal, net of salvage	(34)	(54)
Change in construction payables, net	(29)	48
Other investing activities	(15)	(15)
Net cash used for investing activities	(1,075)	(759)
Proceeds —
Senior notes	500	550
Capital contributions from parent company	488	327
Redemptions and repurchases —
Senior notes	0	(200)
Payment of common stock dividends	(402)	(357)
Other financing activities	(21)	(14)
Net cash provided from financing activities	565	306
Net Change in Cash, Cash Equivalents, and Restricted Cash	142	219
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	544	420
Cash, Cash Equivalents, and Restricted Cash at End of Period	686	639
Cash paid (received) during the period for —
Interest	143	140
Income taxes, net	17	88
Noncash transactions — Accrued property additions at end of period	216	132
GEORGIA POWER CO
Operating Activities:
Net income (loss)	(44)	616
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	562	543
Deferred income taxes	(256)	159
Allowance for equity funds used during construction	(32)	(25)
Deferred expenses	34	41
Pension, postretirement, and other employee benefits	(47)	(45)
Settlement of asset retirement obligations	(49)	(62)
Other, net	27	(39)
Changes in certain current assets and liabilities —
-Receivables	(103)	(150)
-Fossil fuel stock	38	(32)
-Prepaid income taxes	115	(4)
-Other current assets	25	(18)
-Accounts payable	(87)	(153)
-Accrued taxes	(89)	(194)
-Accrued compensation	(56)	(65)
-Retail fuel cost over recovery	0	(84)
-Other current liabilities	(26)	(6)
Net cash provided from operating activities	1,072	482
Investing Activities:
Property additions	(1,501)	(1,284)
Nuclear decommissioning trust fund purchases	(440)	(271)
Nuclear decommissioning trust fund sales	435	266
Cost of removal, net of salvage	(50)	(32)
Change in construction payables, net of joint owner portion	86	1
Payments pursuant to LTSAs	(46)	(56)
Asset dispositions	134	63
Other investing activities	(11)	(12)
Net cash used for investing activities	(1,393)	(1,325)
Financing Activities:
Increase (decrease) in notes payable, net	480	37
Proceeds —
Senior notes	0	850
Short-term borrowings	0	800
Capital contributions from parent company	1,502	380
Redemptions and repurchases —
Senior notes	(1,000)	(450)
Pollution control revenue bonds	(398)	(27)
Other long-term debt	(100)	0
Short-term borrowings	(150)	0
Payment of common stock dividends	(691)	(640)
Premiums on redemption and repurchases of senior notes	(152)	0
Other financing activities	(11)	(19)
Net cash provided from financing activities	(520)	931
Net Change in Cash, Cash Equivalents, and Restricted Cash	(841)	88
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	852	3
Cash, Cash Equivalents, and Restricted Cash at End of Period	11	91
Cash paid (received) during the period for —
Interest	211	186
Income taxes, net	64	213
Noncash transactions — Accrued property additions at end of period	669	348
GULF POWER CO
Operating Activities:
Net income (loss)	84	57
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	98	56
Deferred income taxes	(21)	19
Loss on Plant Scherer Unit 3	0	33
Other, net	(3)	(3)
Changes in certain current assets and liabilities —
-Receivables	9	(25)
-Other current assets	(2)	14
-Accounts payable	(16)	3
-Accrued taxes	18	7
-Accrued compensation	(15)	(17)
-Over recovered regulatory clause revenues	5	(19)
-Other current liabilities	0	(1)
Net cash provided from operating activities	157	124
Investing Activities:
Property additions	(135)	(97)
Cost of removal, net of salvage	(14)	(9)
Change in construction payables, net	(3)	(14)
Other investing activities	(6)	(3)
Net cash used for investing activities	(158)	(123)
Financing Activities:
Increase (decrease) in notes payable, net	45	(190)
Proceeds —
Senior notes	0	300
Capital contributions from parent company	37	5
Common stock	0	175
Redemptions and repurchases —
Preferred and preference stock	0	(150)
Senior notes	0	(85)
Payment of common stock dividends	(77)	(63)
Other financing activities	(1)	(4)
Net cash provided from financing activities	4	(12)
Net Change in Cash, Cash Equivalents, and Restricted Cash	3	(11)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	28	56
Cash, Cash Equivalents, and Restricted Cash at End of Period	31	45
Cash paid (received) during the period for —
Interest	25	22
Income taxes, net	21	7
Noncash transactions — Accrued property additions at end of period	22	19
MISSISSIPPI POWER CO
Operating Activities:
Net income (loss)	40	(2,073)
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	86	94
Deferred income taxes	289	(860)
Allowance for equity funds used during construction	0	(71)
Estimated loss on plants under construction	28	3,120
Other, net	(13)	(11)
Changes in certain current assets and liabilities —
-Receivables	(51)	(15)
-Fossil fuel stock	(2)	21
-Other current assets	(9)	(10)
-Accounts payable	(15)	(20)
-Accrued taxes	(41)	0
-Accrued compensation	(14)	(17)
-Over recovered regulatory clause revenues	10	(30)
-Other current liabilities	(11)	7
Net cash provided from operating activities	297	135
Investing Activities:
Property additions	(74)	(337)
Change in construction payables, net	(9)	(19)
Payments pursuant to LTSAs	(13)	3
Other investing activities	(12)	(8)
Net cash used for investing activities	(108)	(361)
Financing Activities:
Increase (decrease) in notes payable, net	(4)	(10)
Proceeds —
Senior notes	600	0
Short-term borrowings	300	4
Capital contributions from parent company	1	1,001
Long-term debt to parent company	0	(40)
Redemptions and repurchases —
Other long-term debt	(900)	(300)
Short-term borrowings	(200)	0
Long-term debt to parent company	0	(591)
Other financing activities	(6)	(2)
Net cash provided from financing activities	(209)	142
Net Change in Cash, Cash Equivalents, and Restricted Cash	(20)	(84)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	248	224
Cash, Cash Equivalents, and Restricted Cash at End of Period	228	140
Cash paid (received) during the period for —
Interest	39	26
Income taxes, net	(257)	(93)
Noncash transactions — Accrued property additions at end of period	23	59
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	160	168
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	256	264
Deferred income taxes	(252)	91
Amortization of investment tax credits	(29)	(28)
Deferred revenues	(19)	(34)
Income taxes receivable, non-current	(4)	(58)
Asset impairment	119	0
Other, net	13	(1)
Changes in certain current assets and liabilities —
-Receivables	(30)	(58)
-Prepaid income taxes	(36)	33
-Other current assets	3	20
-Accounts payable	(41)	(45)
-Accrued taxes	15	4
-Other current liabilities	(28)	(8)
Net cash provided from operating activities	127	348
Investing Activities:
Business acquisitions, net of cash acquired	(64)	(1,004)
Property additions	(198)	(145)
Change in construction payables, net	2	(167)
Payments pursuant to LTSAs	(32)	(68)
Other investing activities	15	(3)
Net cash used for investing activities	(277)	(1,387)
Financing Activities:
Increase (decrease) in notes payable, net	(41)	189
Proceeds —
Short-term borrowings	200	0
Capital contributions from parent company	16	0
Redemptions and repurchases —
Return of paid in capital	(250)	0
Senior notes	(350)	0
Other long-term debt	(420)	(3)
Distributions to noncontrolling interests	(42)	(40)
Capital contributions from noncontrolling interests	1,210	73
Payment of common stock dividends	(156)	(158)
Other financing activities	(15)	(18)
Net cash provided from financing activities	152	43
Net Change in Cash, Cash Equivalents, and Restricted Cash	2	(996)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	140	1,112
Cash, Cash Equivalents, and Restricted Cash at End of Period	142	116
Cash paid (received) during the period for —
Interest	109	113
Income taxes, net	109	(117)
Noncash transactions — Accrued property additions at end of period	33	19
SOUTHERN Co GAS
Operating Activities:
Net income (loss)	248	288
Adjustments to reconcile consolidated net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	255	244
Deferred income taxes	(12)	144
Mark-to-market adjustments	2	(49)
Goodwill impairment	42	0
Loss on disposition	36	0
Other, net	(24)	(34)
Changes in certain current assets and liabilities —
-Receivables	504	418
-Natural gas for sale, net of temporary LIFO liquidation	295	223
-Prepaid income taxes	9	24
-Other current assets	32	(12)
-Accounts payable	(125)	(102)
-Accrued taxes	38	(8)
-Accrued compensation	(6)	(12)
-Other current liabilities	24	25
Net cash provided from operating activities	1,318	1,149
Investing Activities:
Property additions	(679)	(684)
Cost of removal, net of salvage	(18)	(25)
Change in construction payables, net	(6)	23
Investment in unconsolidated subsidiaries	(60)	(111)
Asset dispositions	364	0
Other investing activities	18	18
Net cash used for investing activities	(381)	(779)
Financing Activities:
Increase (decrease) in notes payable, net	(515)	(631)
Proceeds —
Senior notes	0	450
Capital contributions from parent company	10	57
Redemptions and repurchases —
Long-term debt	(200)	0
Payment of common stock dividends	(235)	(221)
Other financing activities	0	(6)
Net cash provided from financing activities	(940)	(351)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(3)	19
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	78	24
Cash, Cash Equivalents, and Restricted Cash at End of Period	75	43
Cash paid (received) during the period for —
Interest	129	105
Income taxes, net	106	20
Noncash transactions — Accrued property additions at end of period	$ 129	$ 84