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Segment and Related Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Financial Data for Business Segments
Financial data for business segments and products and services for the three and nine months ended September 30, 2017 and 2016 was as follows:
 
Electric Utilities
 
 
 
 
 
Traditional
Electric Operating
Companies
Southern
Power
Eliminations
Total
Southern Company Gas
All
Other
Eliminations
Consolidated
 
(in millions)
Three Months Ended
September 30, 2017:
 
 
 
 
 
 
 
 
Operating revenues
$
5,017

$
618

$
(112
)
$
5,523

$
565

$
153

$
(40
)
$
6,201

Segment net income (loss)(a)(b)
1,008

124

—

1,132

15

(80
)
2

1,069

Nine Months Ended
September 30, 2017:
 
 
 
 


 
 
 
Operating revenues
$
12,960

$
1,597

$
(318
)
$
14,239

$
2,841

$
442

$
(119
)
$
17,403

Segment net income (loss)(a)(b)(c)
—

276

—

276

303

(232
)
—

347

Total assets at September 30, 2017
$
73,056

$
14,648

$
(322
)
$
87,382

$
22,190

$
2,275

$
(1,532
)
$
110,315

Three Months Ended
September 30, 2016:
 
 
 
 
 
 
 
 
Operating revenues
$
5,236

$
500

$
(117
)
$
5,619

$
543

$
139

$
(37
)
$
6,264

Segment net income (loss)(a)(b)
1,022

176

—

1,198

4

(62
)
(1
)
1,139

Nine Months Ended
September 30, 2016:
 
 
 
 
 
 
 
 
Operating revenues
$
13,120

$
1,189

$
(330
)
$
13,979

$
543

$
311

$
(118
)
$
14,715

Segment net income (loss)(a)(b)
2,086

315

—

2,401

4

(146
)
(8
)
2,251

Total assets at December 31, 2016
$
72,141

$
15,169

$
(316
)
$
86,994

$
21,853

$
2,474

$
(1,624
)
$
109,697

(a)
Attributable to Southern Company.
(b)
Segment net income (loss) for the traditional electric operating companies includes pre-tax charges for estimated probable losses on the Kemper IGCC of $34 million ($21 million after tax) and $88 million ($54 million after tax) for the three months ended September 30, 2017 and 2016, respectively, and $3.2 billion ($2.2 billion after tax) and $222 million ($137 million after tax) for the nine months ended September 30, 2017 and 2016, respectively. See Note (B) under "Integrated Coal Gasification Combined Cycle – Kemper IGCC Schedule and Cost Estimate" for additional information.
(c)
Segment net income (loss) for the traditional electric operating companies also includes a pre-tax charge for the write-down of Gulf Power's ownership of Plant Scherer Unit 3 of $33 million ($20 million after tax) for the nine months ended September 30, 2017. See Note (B) under "Regulatory Matters – Gulf Power – Retail Base Rate Cases" for additional information.
Business segment financial data for the successor three months ended September 30, 2017 and 2016, the successor nine months ended September 30, 2017, the successor period of July 1, 2016 through September 30, 2016, and the predecessor period of January 1, 2016 through June 30, 2016 was as follows:
 
Gas Distribution Operations
Gas Marketing Services
Wholesale Gas Services(*)
Gas Midstream Operations
Total
All Other
Eliminations
Consolidated
 
(in millions)
Successor – Three Months Ended September 30, 2017:
 
 
 
 
 
 
Operating revenues
$
472

$
143

$
(24
)
$
16

$
607

$
2

$
(44
)
$
565

Segment net income
52

1

(23
)
14

44

(29
)
—

15

Successor – Nine Months Ended September 30, 2017:
 
 
 
 
 
 
Operating revenues
$
2,255

$
597

$
95

$
53

$
3,000

$
7

$
(166
)
$
2,841

Segment net income
223

36

28

38

325

(22
)
—

303

Successor – Total assets at
September 30, 2017
$
18,711

$
2,089

$
893

$
2,359

$
24,052

$
11,400

$
(13,262
)
$
22,190

 
Gas Distribution Operations
Gas Marketing Services
Wholesale Gas Services(*)
Gas Midstream Operations
Total
All Other
Eliminations
Consolidated
 
(in millions)
Successor – Three Months Ended September 30, 2016:
 
 
 
 
 
 
Operating revenues
$
455

$
126

$
(8
)
$
13

$
586

$
2

$
(45
)
$
543

Segment net income (loss)
27

(4
)
(11
)
14

26

(22
)
—

4

Predecessor – January 1, 2016 through June 30, 2016:
 
 
 
 
 
 
Operating revenues
$
1,575

$
435

$
(32
)
$
25

$
2,003

$
4

$
(102
)
$
1,905

Segment EBIT
353

109

(68
)
(6
)
388

(60
)
—

328

Successor – Total assets at
December 31, 2016
$
19,453

$
2,084

$
1,127

$
2,211

$
24,875

$
11,145

$
(14,167
)
$
21,853

(*)
The revenues for wholesale gas services are netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table.
 
Third Party Gross Revenues
 
Intercompany Revenues
 
Total Gross Revenues
 
Less Gross Gas Costs
 
Operating Revenues
 
(in millions)
Successor – Three Months Ended September 30, 2017
$
1,411

 
$
103

 
$
1,514

 
$
1,538

 
$
(24
)
Successor – Nine Months Ended September 30, 2017
4,781

 
362

 
5,143

 
5,048

 
95

Successor – Three Months Ended September 30, 2016
1,688

 
77

 
1,765

 
1,773

 
(8
)
Predecessor – January 1, 2016 through June 30, 2016
$
2,500

 
$
143

 
$
2,643

 
$
2,675

 
$
(32
)
Financial Data for Products and Services
Products and Services
 
 
Electric Utilities' Revenues
Period
 
Retail
 
Wholesale
 
Other
 
Total
 
 
(in millions)
Three Months Ended September 30, 2017
 
$
4,615

 
$
718

 
$
190

 
$
5,523

Three Months Ended September 30, 2016
 
4,808

 
613

 
198

 
5,619

 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
 
$
11,786

 
$
1,867

 
$
586

 
$
14,239

Nine Months Ended September 30, 2016
 
11,932

 
1,455

 
592

 
13,979

 
Southern Company Gas' Revenues
Period
Gas
Distribution
Operations
Gas
Marketing
Services
Other
Total
 
(in millions)
Three Months Ended September 30, 2017
$
430

$
143

$
(8
)
$
565

Nine Months Ended September 30, 2017
$
2,119

$
597

$
125

$
2,841

Three and Nine Months Ended September 30, 2016
$
420

$
126

$
(3
)
$
543