Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net income (loss)	$ 991	$ 1,107
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	989	964
Deferred income taxes	40	140
Natural gas cost under recovery – long-term	162	(185)
Other, net	7	114
Changes in certain current assets and liabilities —
-Receivables	(217)	308
-Natural gas for sale, net of temporary LIFO liquidation	450	456
-Natural gas cost under recovery	(40)	(487)
-Other current assets	87	90
-Accounts payable	132	(216)
-Accrued taxes	(58)	(212)
-Other current liabilities	35	(63)
Net cash provided from operating activities	1,592	1,242
Investing Activities:
Property additions	(1,419)	(1,678)
Cost of removal, net of salvage	(227)	(85)
Change in construction payables, net	23	(116)
Other investing activities	110	45
Net cash used for investing activities	(1,555)	(2,243)
Proceeds —
Short-term borrowings	850	325
Redemptions and repurchases —
Short-term borrowings	(100)	(25)
Payment of common stock dividends	(702)	(678)
Net cash provided from (used for) financing activities	(193)	1,734
Net Change in Cash, Cash Equivalents, and Restricted Cash	(156)	733
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,673	1,801
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	515	519
Income taxes, net	(8)	(51)
Noncash transactions —
Accrued property additions at year-end	863	872
SOUTHERN Co GAS
Operating Activities:
Net income (loss)	319	398
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	137	130
Deferred income taxes	5	160
Mark-to-market adjustments	(38)	64
Natural gas cost under recovery – long-term	162	(185)
Other, net	41	5
Changes in certain current assets and liabilities —
-Receivables	(115)	74
-Natural gas for sale, net of temporary LIFO liquidation	450	456
-Prepaid income taxes	34	(51)
-Natural gas cost under recovery	(40)	(487)
-Other current assets	39	17
-Accounts payable	(23)	(7)
-Accrued taxes	54	10
-Other current liabilities	(1)	(34)
Net cash provided from operating activities	1,024	550
Investing Activities:
Property additions	(247)	(251)
Cost of removal, net of salvage	(20)	(16)
Change in construction payables, net	(5)	(47)
Other investing activities	1	6
Net cash used for investing activities	(271)	(308)
Financing Activities:
Increase (decrease) in notes payable, net	(577)	(127)
Proceeds —
Short-term borrowings	0	300
Redemptions and repurchases —
Short-term borrowings	(100)	0
Medium-term notes	0	(30)
Capital contributions from parent company	39	39
Payment of common stock dividends	(130)	(132)
Net cash provided from (used for) financing activities	(768)	50
Net Change in Cash, Cash Equivalents, and Restricted Cash	(15)	292
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	48	19
Cash, Cash Equivalents, and Restricted Cash at End of Period	33	311
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	55	52
Income taxes, net	0	(1)
Noncash transactions —
Accrued property additions at year-end	$ 107	$ 95