Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income (loss)	$ 2,059	$ 936
Adjustments to reconcile net income (loss) to net cash provided from (used for) operating activities —
Depreciation and amortization, total	851	873
Deferred income taxes	191	34
Allowance for equity funds used during construction	(32)	(30)
Pension, postretirement, and other employee benefits	(53)	(27)
Settlement of asset retirement obligations	(62)	(41)
Stock based compensation expense	64	69
Estimated loss on Kemper IGCC	6	37
Mark-to-market adjustments	46	(60)
Gain on dispositions, net	(2,503)	1
Other, net	19	73
Changes in certain current assets and liabilities —
-Receivables	378	197
-Prepayments	(129)	(82)
-Natural gas for sale	363	413
-Other current assets	17	7
-Accounts payable	(783)	(425)
-Accrued taxes	928	(79)
-Accrued compensation	(489)	(471)
-Other current liabilities	(127)	84
Net cash used for operating activities	744	1,509
Investing Activities:
Business acquisitions, net of cash acquired	(2)	(46)
Property additions	(1,678)	(1,781)
Nuclear decommissioning trust fund purchases	(197)	(306)
Nuclear decommissioning trust fund sales	192	301
Cost of removal, net of salvage	(89)	(79)
Proceeds from asset dispositions	4,427	135
Change in construction payables, net	(146)	(112)
Investment in unconsolidated subsidiaries	(10)	(30)
Payments pursuant to LTSAs	(28)	(73)
Other investing activities	(15)	(4)
Net cash provided from (used for) investing activities	2,454	(1,995)
Financing Activities:
Increase (decrease) in notes payable, net	86	782
Proceeds —
Long-term debt	1,220	600
Common stock	224	113
Short-term borrowings	0	1,200
Redemptions and repurchases —
Long-term debt	(2,429)	(1,283)
Short-term borrowings	(1,750)	(150)
Distributions to noncontrolling interests	(36)	(13)
Capital contributions from noncontrolling interests	3	8
Payment of common stock dividends	(623)	(586)
Other financing activities	(48)	(42)
Net cash provided from (used for) financing activities	(3,353)	629
Net Change in Cash, Cash Equivalents, and Restricted Cash	(155)	143
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,519	2,147
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,364	2,290
Cash paid (received) during the period for —
Interest, net of amounts capitalized	462	499
Income taxes, net	0	(1)
Noncash transactions — Accrued property additions at end of period	899	894
ALABAMA POWER CO
Operating Activities:
Net income (loss)	221	229
Adjustments to reconcile net income (loss) to net cash provided from (used for) operating activities —
Depreciation and amortization, total	244	228
Deferred income taxes	0	32
Allowance for equity funds used during construction	(14)	(13)
Other, net	(24)	(21)
Changes in certain current assets and liabilities —
-Receivables	105	(1)
-Prepayments	(78)	(82)
-Materials and supplies	(4)	(27)
-Other current assets	19	19
-Accounts payable	(286)	(216)
-Accrued taxes	80	57
-Accrued compensation	(122)	(108)
-Other current liabilities	(9)	45
Net cash used for operating activities	146	155
Investing Activities:
Property additions	(390)	(490)
Nuclear decommissioning trust fund purchases	(68)	(50)
Nuclear decommissioning trust fund sales	68	51
Cost of removal, net of salvage	(16)	(19)
Change in construction payables, net	(95)	(50)
Other investing activities	(10)	(6)
Net cash provided from (used for) investing activities	(511)	(564)
Financing Activities:
Increase (decrease) in notes payable, net	0	245
Proceeds —
Capital contributions from parent company	1,232	484
Redemptions and repurchases —
Senior notes	(200)	0
Payment of common stock dividends	(211)	(202)
Other financing activities	(10)	(9)
Net cash provided from (used for) financing activities	811	518
Net Change in Cash, Cash Equivalents, and Restricted Cash	446	109
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	313	544
Cash, Cash Equivalents, and Restricted Cash at End of Period	759	653
Cash paid (received) during the period for —
Interest, net of amounts capitalized	89	84
Income taxes, net	0	9
Noncash transactions — Accrued property additions at end of period	176	195
GEORGIA POWER CO
Operating Activities:
Net income (loss)	311	352
Adjustments to reconcile net income (loss) to net cash provided from (used for) operating activities —
Depreciation and amortization, total	287	280
Deferred income taxes	127	(38)
Pension, postretirement, and other employee benefits	(35)	(19)
Settlement of asset retirement obligations	(34)	(23)
Other, net	(18)	28
Changes in certain current assets and liabilities —
-Receivables	91	135
-Fossil fuel stock	(41)	24
-Prepaid income taxes	(73)	84
-Other current assets	33	9
-Accounts payable	(166)	(180)
-Accrued taxes	(245)	(191)
-Accrued compensation	(67)	(85)
-Other current liabilities	42	(3)
Net cash used for operating activities	212	373
Investing Activities:
Property additions	(875)	(681)
Nuclear decommissioning trust fund purchases	(129)	(255)
Nuclear decommissioning trust fund sales	124	250
Cost of removal, net of salvage	(58)	(26)
Proceeds from asset dispositions	7	134
Change in construction payables, net of joint owner portion	(38)	(47)
Payments pursuant to LTSAs	(2)	(43)
Other investing activities	(9)	0
Net cash provided from (used for) investing activities	(980)	(668)
Financing Activities:
Increase (decrease) in notes payable, net	(19)	0
Proceeds —
FFB loan	835	0
Pollution control revenue bonds	343	0
Capital contributions from parent company	27	1,474
Redemptions and repurchases —
Pollution control revenue bonds	(108)	(278)
Short-term borrowings	0	(150)
Other long-term debt	0	(100)
Payment of common stock dividends	(394)	(339)
Other financing activities	(19)	(6)
Net cash provided from (used for) financing activities	665	601
Net Change in Cash, Cash Equivalents, and Restricted Cash	(103)	306
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	112	852
Cash, Cash Equivalents, and Restricted Cash at End of Period	9	1,158
Cash paid (received) during the period for —
Interest, net of amounts capitalized	92	115
Noncash transactions — Accrued property additions at end of period	607	525
MISSISSIPPI POWER CO
Operating Activities:
Net income (loss)	37	(7)
Adjustments to reconcile net income (loss) to net cash provided from (used for) operating activities —
Depreciation and amortization, total	50	44
Deferred income taxes	(8)	155
Estimated loss on Kemper IGCC	6	37
Other, net	(10)	3
Changes in certain current assets and liabilities —
-Receivables	11	(129)
-Other current assets	7	(12)
-Accounts payable	(38)	(21)
-Accrued taxes	(62)	(110)
-Accrued compensation	(22)	(22)
-Other current liabilities	6	0
Net cash used for operating activities	(23)	(62)
Investing Activities:
Property additions	(45)	(33)
Change in construction payables, net	(8)	(2)
Other investing activities	(10)	(17)
Net cash provided from (used for) investing activities	(63)	(52)
Financing Activities:
Increase (decrease) in notes payable, net	0	(4)
Proceeds —
Senior notes	0	600
Short-term borrowings	0	300
Pollution control revenue bonds	43	0
Redemptions and repurchases —
Other long-term debt	0	(900)
Return of capital	(38)	0
Other financing activities	0	(5)
Net cash provided from (used for) financing activities	5	(9)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(81)	(123)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	293	248
Cash, Cash Equivalents, and Restricted Cash at End of Period	212	125
Cash paid (received) during the period for —
Interest, net of amounts capitalized	13	21
Income taxes, net	0	19
Noncash transactions — Accrued property additions at end of period	27	30
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	27	115
Adjustments to reconcile net income (loss) to net cash provided from (used for) operating activities —
Depreciation and amortization, total	125	122
Deferred income taxes	17	(50)
Amortization of investment tax credits	(14)	(14)
Other, net	(7)	2
Changes in certain current assets and liabilities —
-Receivables	10	48
-Prepaid income taxes	(9)	(32)
-Other current assets	3	5
-Accounts payable	(32)	(43)
-Accrued compensation	(15)	(13)
-Other current liabilities	5	9
Net cash used for operating activities	110	149
Investing Activities:
Business acquisitions, net of cash acquired	(2)	(46)
Property additions	(66)	(121)
Change in construction payables, net	(7)	25
Payments pursuant to LTSAs	(15)	(18)
Other investing activities	11	7
Net cash provided from (used for) investing activities	(79)	(153)
Financing Activities:
Increase (decrease) in notes payable, net	5	29
Redemptions and repurchases —
Distributions to noncontrolling interests	(36)	(13)
Capital contributions from noncontrolling interests	3	8
Payment of common stock dividends	(51)	(78)
Net cash provided from (used for) financing activities	(79)	(54)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(48)	(58)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	181	140
Cash, Cash Equivalents, and Restricted Cash at End of Period	133	82
Cash paid (received) during the period for —
Interest, net of amounts capitalized	28	29
Income taxes, net	1	(39)
Noncash transactions — Accrued property additions at end of period	19	57
SOUTHERN Co GAS
Operating Activities:
Net income (loss)	270	279
Adjustments to reconcile net income (loss) to net cash provided from (used for) operating activities —
Depreciation and amortization, total	118	129
Deferred income taxes	42	47
Mark-to-market adjustments	45	(59)
Goodwill impairment	0	42
Other, net	(20)	(2)
Changes in certain current assets and liabilities —
-Receivables	238	175
-Natural gas for sale	363	413
-Other current assets	59	35
-Accounts payable	(353)	(119)
-Accrued taxes	21	28
-Accrued compensation	(50)	(38)
-Other current liabilities	(50)	48
Net cash used for operating activities	683	978
Investing Activities:
Property additions	(256)	(268)
Cost of removal, net of salvage	(12)	(14)
Change in construction payables, net	1	(46)
Investment in unconsolidated subsidiaries	(10)	(29)
Other investing activities	(13)	(4)
Net cash provided from (used for) investing activities	(290)	(361)
Financing Activities:
Increase (decrease) in notes payable, net	(289)	(483)
Redemptions and repurchases —
Payment of common stock dividends	(118)	(118)
Other financing activities	5	6
Net cash provided from (used for) financing activities	(402)	(595)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(9)	22
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	70	78
Cash, Cash Equivalents, and Restricted Cash at End of Period	61	100
Cash paid (received) during the period for —
Interest, net of amounts capitalized	55	52
Income taxes, net	(1)	0
Noncash transactions — Accrued property additions at end of period	$ 98	$ 89