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Introduction (Tables)
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
The specific impacts of applying ASC 606 to revenues from contracts with customers on the financial statements of Southern Company, Alabama Power, Georgia Power, and Southern Company Gas compared to previously recognized guidance is shown below.
 
For the Three Months Ended
September 30, 2018
 
For the Nine Months Ended
September 30, 2018
Condensed Statements of Income
As Reported
Balances Without Adoption of
ASC 606
Effect of Change
 
As Reported
Balances Without Adoption of
ASC 606
Effect of Change
 
(in millions)
 
(in millions)
Southern Company
 
 
 
 
 
 
 
Natural gas revenues
$
492

$
497

$
(5
)
 
$
2,806

$
2,805

$
1

Other revenues
199

198

1

 
1,007

1,003

4

Other operations and maintenance
1,404

1,387

17

 
4,217

4,178

39

Operating income
2,174

2,195

(21
)
 
3,613

3,647

(34
)
Other income (expense), net
57

41

16

 
195

160

35

Earnings (loss) before income taxes
1,845

1,850

(5
)
 
2,629

2,628

1

Income taxes (benefit)
623

624

(1
)
 
598

598

—

Consolidated net income (loss)
1,222

1,226

(4
)
 
2,031

2,030

1

Consolidated net income (loss) attributable to Southern Company
1,164

1,168

(4
)
 
1,948

1,947

1

 
 
 
 
 
 
 
 
Alabama Power
 
 
 
 
 
 
 
Other revenues
$
68

$
59

$
9

 
$
199

$
173

$
26

Other operations and maintenance
401

390

11

 
1,191

1,159

32

Operating income
561

563

(2
)
 
1,313

1,319

(6
)
Other income (expense), net
9

7

2

 
24

18

6

 
 
 
 
 
 
 
 
Georgia Power
 
 
 
 
 
 
 
Other revenues
$
121

$
97

$
24

 
$
349

$
287

$
62

Other operations and maintenance
460

437

23

 
1,325

1,268

57

Operating income (loss)
991

990

1

 
1,032

1,027

5

Other income (expense), net
30

31

(1
)
 
104

109

(5
)
 
 
 
 
 
 
 
 
Southern Company Gas
 
 
 
 
 
 
 
Natural gas revenues
$
487

$
492

$
(5
)
 
$
2,829

$
2,828

$
1

Operating income
374

379

(5
)
 
810

809

1

Earnings before income taxes
362

367

(5
)
 
769

768

1

Income taxes
316

317

(1
)
 
475

475

—

Net income (loss)
46

50

(4
)
 
294

293

1

 
For the Nine Months Ended
September 30, 2018
Condensed Statements of Cash Flows
As Reported
Balances Without Adoption of
ASC 606
Effect of Change
 
(in millions)
Southern Company
 
 
 
Consolidated net income
$
2,031

$
2,030

$
1

Changes in certain current assets and liabilities:
 
 
 
Receivables
37

27

10

Other current assets
(90
)
(80
)
(10
)
Other current liabilities
(67
)
(68
)
1

 
 
 
 
Georgia Power
 
 
 
Changes in certain current assets and liabilities:
 
 
 
Receivables
$
(205
)
$
(242
)
$
37

Other current assets
(36
)
1

(37
)
 
 
 
 
Southern Company Gas
 
 
 
Net income
$
294

$
293

$
1

Changes in certain current assets and liabilities:
 
 
 
Other current liabilities
35

34

1

 
At September 30, 2018
Condensed Balance Sheets
As Reported
Balances Without Adoption of
ASC 606
Effect of Change
 
(in millions)
Southern Company
 
 
 
Unbilled revenues
$
738

$
776

$
(38
)
Other accounts and notes receivable
690

691

(1
)
Other current assets
232

193

39

Other current liabilities
763

764

(1
)
Retained earnings
9,048

9,047

1

 
 
 
 
Georgia Power
 
 
 
Unbilled revenues
$
245

$
310

$
(65
)
Other accounts and notes receivable
96

97

(1
)
Other current assets
91

25

66

 
 
 
 
Southern Company Gas
 
 
 
Other current liabilities
122

123

(1
)
Accumulated deficit
(273
)
(274
)
1
Schedule of Change in Asset Retirement Obligation
As of September 30, 2018, details of the AROs, including those related to the CCR Rule, included in the condensed balance sheets of Southern Company, Alabama Power, Georgia Power, Gulf Power, and Mississippi Power were as follows:
 
Southern
Company
 
Alabama
Power
 
Georgia
Power
 
Gulf
Power
 
Mississippi
Power
 
(in millions)
Balance at December 31, 2017
$
4,824

 
$
1,709

 
$
2,638

 
$
142

 
$
174

Liabilities incurred
2

 
—

 
—

 
—

 
—

Liabilities settled
(160
)
 
(31
)
 
(82
)
 
(23
)
 
(22
)
Accretion
153

 
72

 
70

 
3

 
4

Cash flow revisions
1,510

 
1,451

 
(32
)
 
42

 
21

Reclassification to held for sale
(164
)
 
—

 
—

 
—

 
—

Balance at September 30, 2018
$
6,165

 
$
3,201

 
$
2,594

 
$
164

 
$
177
Estimated Cost Of Decommissioning
In June 2018, Alabama Power completed an updated decommissioning cost site study for Plant Farley. The estimated costs of decommissioning based on the 2018 site study are as follows:
Decommissioning periods:
 
Beginning year
2037

Completion year
2076

 
 
 
(in millions)
Site study costs:
 
Radiated structures
$
1,621

Non-radiated structures
99

Total site study costs
$
1,720
Schedule of Goodwill
The following table presents year-to-date changes in goodwill balances for Southern Company and Southern Company Gas:
 
Goodwill
 
Southern Company
 
Southern Company Gas
 
 
Gas Distribution Operations
Gas Marketing Services
Total
 
(in millions)
Balance at December 31, 2017
$
6,268

 
$
4,702

$
1,265

$
5,967

Impairment(a)
(42
)
 
—

(42
)
(42
)
Dispositions(b)
(910
)
 
(668
)
(242
)
(910
)
Balance at September 30, 2018
$
5,315

(c) 
$
4,034

$
981

$
5,015


(a)
On April 11, 2018, Southern Company Gas entered into a stock purchase agreement for the sale of Pivotal Home Solutions. In contemplation of the transaction, a goodwill impairment charge of $42 million was recorded in the first quarter 2018. See Note (J) under "Southern Company Gas" for additional information.
(b)
Gas distribution operations reflects goodwill allocated to Elizabethtown Gas, Elkton Gas, and Florida City Gas, which were sold during the third quarter 2018. Gas marketing services reflects goodwill associated with Pivotal Home Solutions, which was sold on June 4, 2018. See Note (J) under "Southern Company Gas" for additional information.
(c)
Total does not add due to rounding.
Schedule of Other Intangible Assets, Finite-Lived
Other intangible assets were as follows:
 
At September 30, 2018
 
At December 31, 2017
 
Gross Carrying Amount
Accumulated Amortization
Other
Intangible Assets, Net
 
Gross Carrying Amount
Accumulated Amortization
Other
Intangible Assets, Net
 
(in millions)
 
(in millions)
Southern Company
 
 
 
 
 
 
 
Other intangible assets subject to amortization:
 
 
 
 
 
 
 
Customer relationships(*)
$
223

$
(87
)
$
136

 
$
288

$
(83
)
$
205

Trade names(*)
70

(18
)
52

 
159

(17
)
142

Storage and transportation contracts
64

(49
)
15

 
64

(34
)
30

PPA fair value adjustments
456

(66
)
390

 
456

(47
)
409

Other
11

(5
)
6

 
17

(5
)
12

Total other intangible assets subject to amortization
$
824

$
(225
)
$
599


$
984

$
(186
)
$
798

Other intangible assets not subject to amortization:
 
 
 
 
 
 
 
Federal Communications Commission licenses
75

—

75

 
75

—

75

Total other intangible assets
$
899

$
(225
)
$
674

 
$
1,059

$
(186
)
$
873

 
 
 
 
 
 
 
 
Southern Power
 
 
 
 
 
 
 
Other intangible assets subject to amortization:
 
 
 
 
 
 
 
PPA fair value adjustments
$
456

$
(66
)
$
390

 
$
456

$
(47
)
$
409

 
 
 
 
 
 
 
 
Southern Company Gas
 
 
 
 
 
 
 
Other intangible assets subject to amortization:
 
 
 
 
 
 
 
Gas marketing services(*)
 
 
 
 
 
 
 
Customer relationships
$
156

$
(78
)
$
78

 
$
221

$
(77
)
$
144

Trade names
26

(6
)
20

 
115

(9
)
106

Wholesale gas services
 
 
 
 
 
 
 
Storage and transportation contracts
64

(49
)
15

 
64

(34
)
30

Total other intangible assets subject to amortization
$
246

$
(133
)
$
113

 
$
400

$
(120
)
$
280

(*)
Balances as of September 30, 2018 reflect Southern Company Gas' sale of Pivotal Home Solutions. See Note (J) under "Southern Company Gas – Sale of Pivotal Home Solutions" for additional information.
Schedule of Other Intangible Assets, Indefinite-Lived
Other intangible assets were as follows:
 
At September 30, 2018
 
At December 31, 2017
 
Gross Carrying Amount
Accumulated Amortization
Other
Intangible Assets, Net
 
Gross Carrying Amount
Accumulated Amortization
Other
Intangible Assets, Net
 
(in millions)
 
(in millions)
Southern Company
 
 
 
 
 
 
 
Other intangible assets subject to amortization:
 
 
 
 
 
 
 
Customer relationships(*)
$
223

$
(87
)
$
136

 
$
288

$
(83
)
$
205

Trade names(*)
70

(18
)
52

 
159

(17
)
142

Storage and transportation contracts
64

(49
)
15

 
64

(34
)
30

PPA fair value adjustments
456

(66
)
390

 
456

(47
)
409

Other
11

(5
)
6

 
17

(5
)
12

Total other intangible assets subject to amortization
$
824

$
(225
)
$
599


$
984

$
(186
)
$
798

Other intangible assets not subject to amortization:
 
 
 
 
 
 
 
Federal Communications Commission licenses
75

—

75

 
75

—

75

Total other intangible assets
$
899

$
(225
)
$
674

 
$
1,059

$
(186
)
$
873

 
 
 
 
 
 
 
 
Southern Power
 
 
 
 
 
 
 
Other intangible assets subject to amortization:
 
 
 
 
 
 
 
PPA fair value adjustments
$
456

$
(66
)
$
390

 
$
456

$
(47
)
$
409

 
 
 
 
 
 
 
 
Southern Company Gas
 
 
 
 
 
 
 
Other intangible assets subject to amortization:
 
 
 
 
 
 
 
Gas marketing services(*)
 
 
 
 
 
 
 
Customer relationships
$
156

$
(78
)
$
78

 
$
221

$
(77
)
$
144

Trade names
26

(6
)
20

 
115

(9
)
106

Wholesale gas services
 
 
 
 
 
 
 
Storage and transportation contracts
64

(49
)
15

 
64

(34
)
30

Total other intangible assets subject to amortization
$
246

$
(133
)
$
113

 
$
400

$
(120
)
$
280

(*)
Balances as of September 30, 2018 reflect Southern Company Gas' sale of Pivotal Home Solutions. See Note (J) under "Southern Company Gas – Sale of Pivotal Home Solutions" for additional information.
Finite-lived Intangible Assets Amortization Expense
Amortization associated with other intangible assets was as follows:
 
Three Months Ended
Nine Months Ended
 
September 30, 2018
 
(in millions)
Southern Company
$
21

$
70

Southern Power
$
6

$
19

Southern Company Gas
$
12

$
42
Schedule of Cash and Cash Equivalents
The following tables provide a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amounts shown in the condensed statements of cash flows for the registrants that had restricted cash at September 30, 2018 and/or December 31, 2017:
 
Southern Company
 
Southern Company Gas
 
(in millions)
At September 30, 2018
 
 
 
Cash and cash equivalents
$
1,847

 
$
56

Cash and cash equivalents classified as assets held for sale
37

 
—

Restricted cash:
 
 
 
Other accounts and notes receivable
6

 
6

Total cash, cash equivalents, and restricted cash
$
1,891

(*) 
$
62

(*)
Total does not add due to rounding.
 
Southern Company
Southern
Power
Southern Company Gas
 
(in millions)
At December 31, 2017
 
 
 
Cash and cash equivalents
$
2,130

$
129

$
73

Restricted cash:
 
 
 
Other accounts and notes receivable
5

—

5

Deferred charges and other assets
12

11

—

Total cash, cash equivalents, and restricted cash
$
2,147

$
140

$
78
Restrictions on Cash and Cash Equivalents
The following tables provide a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amounts shown in the condensed statements of cash flows for the registrants that had restricted cash at September 30, 2018 and/or December 31, 2017:
 
Southern Company
 
Southern Company Gas
 
(in millions)
At September 30, 2018
 
 
 
Cash and cash equivalents
$
1,847

 
$
56

Cash and cash equivalents classified as assets held for sale
37

 
—

Restricted cash:
 
 
 
Other accounts and notes receivable
6

 
6

Total cash, cash equivalents, and restricted cash
$
1,891

(*) 
$
62

(*)
Total does not add due to rounding.
 
Southern Company
Southern
Power
Southern Company Gas
 
(in millions)
At December 31, 2017
 
 
 
Cash and cash equivalents
$
2,130

$
129

$
73

Restricted cash:
 
 
 
Other accounts and notes receivable
5

—

5

Deferred charges and other assets
12

11

—

Total cash, cash equivalents, and restricted cash
$
2,147

$
140

$
78