Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities:
Net income (loss)	$ 2,989	$ 809
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	1,623	1,750
Deferred income taxes	274	(338)
Allowance for equity funds used during construction	(63)	(63)
Mark-to-market adjustments	31	3
Pension, postretirement, and other employee benefits	(65)	(74)
Settlement of asset retirement obligations	(143)	(97)
Stock based compensation expense	75	83
Estimated loss on Kemper IGCC	11	1,088
(Gain) loss on dispositions, net	(2,512)	35
Asset impairment	32	161
Other, net	(22)	(34)
Goodwill impairment	32
Loss on disposition	(2,506)	36
Changes in certain current assets and liabilities —
-Receivables	653	94
-Prepayments	(53)	(73)
-Natural gas for sale, net of temporary LIFO liquidation	255	295
-Other current assets	(18)	(40)
-Accounts payable	(1,045)	(406)
-Accrued taxes	938	213
-Accrued compensation	(312)	(284)
-Other current liabilities	(135)	136
Net cash provided from operating activities	2,513	3,258
Investing Activities:
Property additions	(3,484)	(3,828)
Nuclear decommissioning trust fund purchases	(405)	(571)
Nuclear decommissioning trust fund sales	400	566
Proceeds from dispositions and asset sales	5,000	500
Cost of removal, net of salvage	(197)	(128)
Change in construction payables, net	(107)	49
Investment in unconsolidated subsidiaries	(134)	(63)
Payments pursuant to LTSAs	(64)	(103)
Other investing activities	(7)	(46)
Net cash provided from (used for) investing activities	1,002	(3,624)
Financing Activities:
Increase in notes payable, net	83	1,442
Proceeds —
Long-term debt	1,390	1,100
Common stock	452	222
Short-term borrowings	250	1,650
Redemptions and repurchases —
Long-term debt	(2,560)	(3,379)
Short-term borrowings	(1,850)	(550)
Distributions to noncontrolling interests	(82)	(42)
Capital contributions from noncontrolling interests	5	1,210
Payment of common stock dividends	(1,269)	(1,194)
Other financing activities	(67)	(223)
Net cash provided from (used for) financing activities	(3,648)	236
Net Change in Cash, Cash Equivalents, and Restricted Cash	(133)	(130)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,519	2,147
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,386	2,017
Cash paid during the period for —
Interest, net of amounts capitalized	844	927
Income taxes, net	210	4
Noncash transactions — Accrued property additions at end of period	988	1,067
ALABAMA POWER CO
Operating Activities:
Net income (loss)	520	491
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	493	452
Deferred income taxes	138	48
Allowance for equity funds used during construction	(28)	(27)
Pension, postretirement, and other employee benefits	(13)	(28)
Settlement of asset retirement obligations	(43)	(19)
Other, net	(1)	(21)
Changes in certain current assets and liabilities —
-Receivables	6	(153)
-Prepayments	(59)	(57)
-Other current assets	(10)	29
-Accounts payable	(246)	(196)
-Accrued taxes	8	134
-Accrued compensation	(88)	(70)
-Other current liabilities	13	116
-Materials and supplies	5	(47)
Net cash provided from operating activities	695	652
Investing Activities:
Property additions	(833)	(997)
Nuclear decommissioning trust fund purchases	(139)	(131)
Nuclear decommissioning trust fund sales	139	131
Cost of removal, net of salvage	(48)	(34)
Change in construction payables, net	(103)	(29)
Other investing activities	(18)	(15)
Net cash provided from (used for) investing activities	(1,002)	(1,075)
Proceeds —
Senior notes	0	500
Capital contributions from parent company	1,254	488
Redemptions and repurchases —
Senior notes	(200)	0
Payment of common stock dividends	(422)	(402)
Other financing activities	(15)	(21)
Net cash provided from (used for) financing activities	617	565
Net Change in Cash, Cash Equivalents, and Restricted Cash	310	142
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	313	544
Cash, Cash Equivalents, and Restricted Cash at End of Period	623	686
Cash paid during the period for —
Interest, net of amounts capitalized	154	143
Income taxes, net	63	17
Noncash transactions — Accrued property additions at end of period	168	216
GEORGIA POWER CO
Operating Activities:
Net income (loss)	759	(44)
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	583	562
Deferred income taxes	153	(256)
Pension, postretirement, and other employee benefits	(56)	(47)
Settlement of asset retirement obligations	(76)	(49)
Estimated loss on Kemper IGCC	0	1,060
Other, net	0	29
Changes in certain current assets and liabilities —
-Receivables	(43)	(103)
-Other current assets	22	25
-Accounts payable	(94)	(87)
-Accrued taxes	(139)	(89)
-Accrued compensation	(32)	(56)
-Other current liabilities	(2)	(26)
-Fossil fuel stock	(26)	38
-Prepaid income taxes	63	115
Net cash provided from operating activities	1,112	1,072
Investing Activities:
Property additions	(1,712)	(1,501)
Nuclear decommissioning trust fund purchases	(266)	(440)
Nuclear decommissioning trust fund sales	260	435
Proceeds from dispositions and asset sales	9	134
Cost of removal, net of salvage	(107)	(50)
Payments pursuant to LTSAs	(9)	(46)
Other investing activities	(4)	(11)
Change in construction payables, net of joint owner portion	(5)	86
Net cash provided from (used for) investing activities	(1,834)	(1,393)
Financing Activities:
Increase in notes payable, net	11	480
Proceeds —
Short-term borrowings	250	0
Capital contributions from parent company	46	1,502
FFB loan	835	0
Pollution control revenue bonds	513	0
Redemptions and repurchases —
Short-term borrowings	0	(150)
Senior notes	0	(1,000)
Pollution control revenue bonds	(223)	(398)
Other long-term debt	0	(100)
Payment of common stock dividends	(788)	(691)
Other financing activities	(24)	(11)
Premiums on redemption and repurchases of senior notes	0	(152)
Net cash provided from (used for) financing activities	620	(520)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(102)	(841)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	112	852
Cash, Cash Equivalents, and Restricted Cash at End of Period	10	11
Cash paid during the period for —
Interest, net of amounts capitalized	179	211
Income taxes, net	(6)	64
Noncash transactions — Accrued property additions at end of period	650	669
MISSISSIPPI POWER CO
Operating Activities:
Net income (loss)	74	40
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	98	86
Deferred income taxes	(16)	289
Settlement of asset retirement obligations	(17)	(15)
Estimated loss on Kemper IGCC	11	28
Other, net	1	2
Changes in certain current assets and liabilities —
-Receivables	(8)	(51)
-Other current assets	(3)	(11)
-Accounts payable	(28)	(15)
-Accrued taxes	(43)	(41)
-Accrued compensation	(15)	(14)
-Other current liabilities	6	(1)
Net cash provided from operating activities	60	297
Investing Activities:
Property additions	(95)	(74)
Change in construction payables, net	(12)	(9)
Payments pursuant to LTSAs	(11)	(13)
Other investing activities	(10)	(12)
Net cash provided from (used for) investing activities	(128)	(108)
Financing Activities:
Increase in notes payable, net	0	(4)
Proceeds —
Short-term borrowings	0	300
Senior notes	0	600
Capital contributions from parent company	7	1
Pollution control revenue bonds	43	0
Redemptions and repurchases —
Short-term borrowings	0	(200)
Other long-term debt	0	(900)
Other financing activities	(1)	(6)
Return of capital	(75)	0
Net cash provided from (used for) financing activities	(26)	(209)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	(20)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	293	248
Cash, Cash Equivalents, and Restricted Cash at End of Period	199	228
Cash paid during the period for —
Interest, net of amounts capitalized	36	39
Income taxes, net	23	(257)
Noncash transactions — Accrued property additions at end of period	23	23
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	230	160
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	251	256
Deferred income taxes	(63)	(252)
Asset impairment	0	119
Other, net	(69)	(10)
Amortization of investment tax credits	(122)	(29)
Loss on disposition	(23)	0
Changes in certain current assets and liabilities —
-Receivables	(9)	(30)
-Other current assets	4	3
-Accounts payable	(17)	(41)
-Accrued compensation	(9)	(9)
-Other current liabilities	3	(4)
-Prepaid income taxes	520	(36)
Net cash provided from operating activities	719	127
Investing Activities:
Business acquisitions	(2)	(64)
Property additions	(123)	(198)
Proceeds from dispositions and asset sales	540	0
Change in construction payables, net	(23)	2
Investment in unconsolidated subsidiaries	(116)	0
Payments pursuant to LTSAs	(31)	(32)
Other investing activities	9	15
Net cash provided from (used for) investing activities	254	(277)
Financing Activities:
Increase in notes payable, net	0	(41)
Proceeds —
Short-term borrowings	0	200
Capital contributions from parent company	6	16
Redemptions and repurchases —
Short-term borrowings	(100)	0
Senior notes	0	(350)
Other long-term debt	0	(420)
Distributions to noncontrolling interests	(82)	(42)
Capital contributions from noncontrolling interests	5	1,210
Payment of common stock dividends	(103)	(156)
Other financing activities	(5)	(15)
Return of capital	(505)	(250)
Net cash provided from (used for) financing activities	(784)	152
Net Change in Cash, Cash Equivalents, and Restricted Cash	189	2
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	181	140
Cash, Cash Equivalents, and Restricted Cash at End of Period	370	142
Cash paid during the period for —
Interest, net of amounts capitalized	106	109
Income taxes, net	(421)	109
Noncash transactions — Accrued property additions at end of period	31	33
SOUTHERN Co GAS
Operating Activities:
Net income (loss)	376	248
Adjustments to reconcile net income (loss) to net cash provided from operating activities —
Depreciation and amortization, total	238	255
Deferred income taxes	59	(12)
Mark-to-market adjustments	30	2
Other, net	(26)	(24)
Goodwill impairment	0	42
Loss on disposition	0	36
Changes in certain current assets and liabilities —
-Receivables	717	504
-Natural gas for sale, net of temporary LIFO liquidation	256	295
-Other current assets	29	41
-Accounts payable	(604)	(125)
-Accrued taxes	(54)	38
-Accrued compensation	(34)	(6)
-Other current liabilities	(56)	24
Net cash provided from operating activities	931	1,318
Investing Activities:
Property additions	(603)	(679)
Proceeds from dispositions and asset sales	32	364
Cost of removal, net of salvage	(33)	(18)
Change in construction payables, net	26	(6)
Investment in unconsolidated subsidiaries	(18)	(60)
Other investing activities	10	18
Net cash provided from (used for) investing activities	(586)	(381)
Financing Activities:
Increase in notes payable, net	(158)	(515)
Redemptions and repurchases —
Long-term debt	0	(200)
Payment of common stock dividends	(235)	(235)
Other financing activities	38	10
Net cash provided from (used for) financing activities	(355)	(940)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(10)	(3)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	70	78
Cash, Cash Equivalents, and Restricted Cash at End of Period	60	75
Cash paid during the period for —
Interest, net of amounts capitalized	125	129
Income taxes, net	96	106
Noncash transactions — Accrued property additions at end of period	$ 123	$ 129