Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities:
Net income	$ 4,335	$ 2,031
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,514	2,647
Deferred income taxes	253	(286)
Utilization of federal investment tax credits	722	0
Allowance for equity funds used during construction	(96)	(99)
Pension, postretirement, and other employee benefits	(114)	(60)
Settlement of asset retirement obligations	(225)	(160)
Stock based compensation expense	87	108
Estimated loss on plants	12	1,081
Asset impairment	142	197
(Gain) loss on dispositions, net	(2,517)	(324)
Other, net	1	(20)
Changes in certain current assets and liabilities —
-Receivables	588	37
-Prepayments	61	14
-Natural gas for sale	49	87
-Other current assets	(110)	(90)
-Accounts payable	(1,155)	(248)
-Accrued taxes	679	839
-Accrued compensation	(191)	(138)
-Other current liabilities	(154)	(32)
Net cash provided from operating activities	4,881	5,584
Investing Activities:
Property additions	(5,417)	(5,793)
Nuclear decommissioning trust fund purchases	(683)	(846)
Nuclear decommissioning trust fund sales	678	840
Proceeds from dispositions and asset sales	5,036	2,773
Cost of removal, net of salvage	(290)	(252)
Change in construction payables, net	(132)	91
Investment in unconsolidated subsidiaries	(141)	(93)
Payments pursuant to LTSAs	(139)	(157)
Other investing activities	15	(63)
Net cash used for investing activities	(1,073)	(3,500)
Financing Activities:
Increase (decrease) in notes payable, net	(773)	(1,225)
Proceeds —
Long-term debt	4,737	1,950
Common stock	623	878
Short-term borrowings	250	3,150
Redemptions and repurchases —
Long-term debt	(3,216)	(4,498)
Short-term borrowings	(1,850)	(1,800)
Distributions to noncontrolling interests	(125)	(86)
Capital contributions from noncontrolling interests	11	1,333
Payment of common stock dividends	(1,919)	(1,805)
Other financing activities	(130)	(237)
Net cash used for financing activities	(2,392)	(2,340)
Net Change in Cash, Cash Equivalents, and Restricted Cash	1,416	(256)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,519	2,147
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,935	1,891
Cash paid during the period for —
Interest, net of amounts capitalized	1,318	1,402
Income taxes, net	265	137
Noncash transactions — Accrued property additions at end of period	953	1,125
ALABAMA POWER CO
Operating Activities:
Net income	993	868
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	756	683
Deferred income taxes	148	104
Allowance for equity funds used during construction	(41)	(43)
Pension, postretirement, and other employee benefits	(30)	(17)
Settlement of asset retirement obligations	(76)	(31)
Other, net	17	11
Changes in certain current assets and liabilities —
-Receivables	(115)	(207)
-Prepayments	(30)	(26)
-Other current assets	(30)	66
-Accounts payable	(267)	(194)
-Accrued taxes	149	225
-Accrued compensation	(55)	(41)
-Other current liabilities	41	60
-Materials and supplies	11	(69)
Net cash provided from operating activities	1,471	1,389
Investing Activities:
Property additions	(1,239)	(1,529)
Nuclear decommissioning trust fund purchases	(201)	(207)
Nuclear decommissioning trust fund sales	201	207
Cost of removal, net of salvage	(79)	(78)
Change in construction payables, net	(99)	30
Other investing activities	(22)	(23)
Net cash used for investing activities	(1,439)	(1,600)
Proceeds —
Senior notes	600	500
Capital contributions from parent company	1,252	495
Redemptions and repurchases —
Senior notes	(200)	0
Payment of common stock dividends	(633)	(602)
Other financing activities	(27)	(24)
Net cash used for financing activities	992	369
Net Change in Cash, Cash Equivalents, and Restricted Cash	1,024	158
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	313	544
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,337	702
Cash paid during the period for —
Interest, net of amounts capitalized	246	220
Income taxes, net	89	30
Noncash transactions — Accrued property additions at end of period	173	275
GEORGIA POWER CO
Operating Activities:
Net income	1,598	621
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	887	854
Deferred income taxes	145	(185)
Allowance for equity funds used during construction	(49)	(50)
Pension, postretirement, and other employee benefits	(85)	(46)
Settlement of asset retirement obligations	(110)	(82)
Estimated loss on plants	0	1,060
Other, net	61	9
Changes in certain current assets and liabilities —
-Receivables	(128)	(205)
-Other current assets	(35)	(36)
-Accounts payable	(134)	109
-Accrued taxes	138	26
-Accrued compensation	(12)	(32)
-Other current liabilities	0	(111)
-Fossil fuel stock	(13)	70
-Prepaid income taxes	102	231
Net cash provided from operating activities	2,365	2,233
Investing Activities:
Property additions	(2,581)	(2,276)
Nuclear decommissioning trust fund purchases	(483)	(638)
Nuclear decommissioning trust fund sales	477	633
Proceeds from dispositions and asset sales	9	138
Cost of removal, net of salvage	(136)	(71)
Payments pursuant to LTSAs	(17)	(52)
Other investing activities	13	(19)
Change in construction payables, net of joint owner portion	(75)	72
Net cash used for investing activities	(2,793)	(2,213)
Financing Activities:
Increase (decrease) in notes payable, net	(294)	102
Proceeds —
Short-term borrowings	250	0
Senior notes	750	0
Capital contributions from parent company	82	2,335
FFB loan	835	0
Pollution control revenue bonds	584	0
Redemptions and repurchases —
Short-term borrowings	0	(150)
Senior notes	0	(1,000)
Pollution control revenue bonds	(223)	(469)
Other long-term debt	0	(100)
Payment of common stock dividends	(1,182)	(1,043)
Other financing activities	(37)	(15)
Premiums on redemption and repurchases of senior notes	0	(152)
Net cash used for financing activities	765	(492)
Net Change in Cash, Cash Equivalents, and Restricted Cash	337	(472)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	112	852
Cash, Cash Equivalents, and Restricted Cash at End of Period	449	380
Cash paid during the period for —
Interest, net of amounts capitalized	296	315
Income taxes, net	45	141
Noncash transactions — Accrued property additions at end of period	589	670
MISSISSIPPI POWER CO
Operating Activities:
Net income	139	87
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	148	129
Deferred income taxes	10	420
Settlement of asset retirement obligations	(28)	(22)
Estimated loss on plants	12	21
Other, net	(4)	27
Changes in certain current assets and liabilities —
-Receivables	(11)	(46)
-Other current assets	18	(6)
-Accounts payable	(26)	(3)
-Accrued taxes	(12)	57
-Accrued compensation	(10)	(9)
-Other current liabilities	6	1
Net cash provided from operating activities	242	656
Investing Activities:
Property additions	(134)	(117)
Change in construction payables, net	(16)	(9)
Payments pursuant to LTSAs	(18)	(28)
Other investing activities	(30)	(16)
Net cash used for investing activities	(198)	(170)
Financing Activities:
Increase (decrease) in notes payable, net	0	(4)
Proceeds —
Short-term borrowings	0	300
Senior notes	0	600
Pollution control revenue bonds	43	0
Redemptions and repurchases —
Short-term borrowings	0	(300)
Pollution control revenue bonds	0	(43)
Other long-term debt	0	(900)
Other financing activities	1	(8)
Return of capital	(113)	0
Net cash used for financing activities	(69)	(355)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(25)	131
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	293	248
Cash, Cash Equivalents, and Restricted Cash at End of Period	268	379
Cash paid during the period for —
Interest, net of amounts capitalized	55	57
Income taxes, net	0	(483)
Noncash transactions — Accrued property additions at end of period	20	23
SOUTHERN POWER CO
Operating Activities:
Net income	342	306
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	377	394
Deferred income taxes	(122)	(337)
Utilization of federal investment tax credits	705	0
Asset impairment	0	155
Other, net	(43)	(2)
Amortization of investment tax credits	(136)	(43)
Changes in certain current assets and liabilities —
-Receivables	15	(41)
-Other current assets	(3)	1
-Accounts payable	(5)	(27)
-Accrued taxes	66	256
-Other current liabilities	(8)	(1)
-Prepaid income taxes	33	5
Net cash provided from operating activities	1,221	666
Investing Activities:
Business acquisitions, net of cash acquired	(50)	(64)
Property additions	(284)	(226)
Proceeds from dispositions and asset sales	572	0
Change in construction payables, net	(11)	3
Investment in unconsolidated subsidiaries	(116)	0
Payments pursuant to LTSAs	(85)	(57)
Other investing activities	10	20
Net cash used for investing activities	36	(324)
Financing Activities:
Increase (decrease) in notes payable, net	0	(68)
Proceeds —
Short-term borrowings	0	200
Capital contributions from parent company	59	0
Redemptions and repurchases —
Short-term borrowings	(100)	0
Senior notes	0	(350)
Other long-term debt	0	(420)
Distributions to noncontrolling interests	(125)	(86)
Capital contributions from noncontrolling interests	11	1,333
Payment of common stock dividends	(154)	(234)
Other financing activities	(6)	(15)
Return of capital	(755)	(650)
Net cash used for financing activities	(1,070)	(290)
Net Change in Cash, Cash Equivalents, and Restricted Cash	187	52
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	181	140
Cash, Cash Equivalents, and Restricted Cash at End of Period	368	192
Cash paid during the period for —
Interest, net of amounts capitalized	133	138
Income taxes, net	(612)	(102)
Noncash transactions — Accrued property additions at end of period	41	37
SOUTHERN Co GAS
Operating Activities:
Net income	347	294
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	359	374
Deferred income taxes	96	(83)
Mark-to-market adjustments	44	23
Asset impairment	92	42
(Gain) loss on dispositions, net	0	(317)
Other, net	(58)	(41)
Changes in certain current assets and liabilities —
-Receivables	832	445
-Natural gas for sale	49	87
-Other current assets	45	(2)
-Accounts payable	(607)	(59)
-Accrued taxes	(68)	(64)
-Accrued compensation	(34)	2
-Other current liabilities	(48)	35
Net cash provided from operating activities	1,049	736
Investing Activities:
Property additions	(1,008)	(1,029)
Proceeds from dispositions and asset sales	32	2,631
Cost of removal, net of salvage	(59)	(67)
Change in construction payables, net	57	(14)
Investment in unconsolidated subsidiaries	(25)	(90)
Other investing activities	14	18
Net cash used for investing activities	(989)	1,449
Financing Activities:
Increase (decrease) in notes payable, net	(383)	(1,382)
Proceeds —
Capital contributions from parent company	820	35
First mortgage bonds	200	100
Redemptions and repurchases —
Long-term debt	0	(200)
Senior notes	(300)	0
First mortgage bonds	(50)	0
Payment of common stock dividends	(353)	(351)
Other financing activities	(2)	(3)
Return of capital	0	(400)
Net cash used for financing activities	(68)	(2,201)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(8)	(16)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	70	78
Cash, Cash Equivalents, and Restricted Cash at End of Period	62	62
Cash paid during the period for —
Interest, net of amounts capitalized	180	175
Income taxes, net	48	682
Noncash transactions — Accrued property additions at end of period	$ 154	$ 121