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Segment and Related Information (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Financial data for business segments
Financial data for business segments and products and services for the three and six months ended June 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
June 30, 2017:
 
 
 
 
 
 
 
 
Operating revenues
$
4,157

$
529

$
(101
)
$
4,585

$
716

$
166

$
(37
)
$
5,430

Segment net income (loss)(a)(b)
(1,442
)
82

—

(1,360
)
49

(68
)
(2
)
(1,381
)
Six Months Ended
June 30, 2017:
 
 
 
 
 
 
 
 
Operating revenues
$
7,943

$
979

$
(206
)
$
8,716

$
2,276

$
289

$
(79
)
$
11,202

Segment net income (loss)(a)(b)(c)
(1,010
)
151

—

(859
)
288

(152
)
—

(723
)
Total assets at June 30, 2017
$
71,503

$
14,703

$
(317
)
$
85,889

$
21,809

$
2,348

$
(1,362
)
$
108,684

Three Months Ended
June 30, 2016:
 
 
 
 
 
 
 
 
Operating revenues
$
4,115

$
373

$
(109
)
$
4,379

$
—

$
125

$
(45
)
$
4,459

Segment net income (loss)(a)(b)
599

89

—

688

—

(61
)
(4
)
623

Six Months Ended
June 30, 2016:
 
 
 
 
 
 
 
 
Operating revenues
$
7,884

$
688

$
(212
)
$
8,360

$
—

$
172

$
(81
)
$
8,451

Segment net income (loss)(a)(b)
1,064

139

—

1,203

—

(84
)
(7
)
1,112

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 $3.0 billion ($2.1 billion after tax) and $81 million ($50 million after tax) for the three months ended June 30, 2017 and 2016, respectively, and $3.1 billion ($2.2 billion after tax) and $134 million ($83 million after tax) for the six months ended June 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 six months ended June 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 and six months ended June 30, 2017 and the predecessor three and six months ended 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 June 30, 2017:
 
 
 
 
 
 
Operating revenues
$
603

$
166

$
(12
)
$
12

$
769

$
3

$
(56
)
$
716

Segment net income
54

4

(17
)
9

50

(1
)
—

49

Successor – Six Months Ended June 30, 2017:
 
 
 
 
 
 
Operating revenues
$
1,783

$
454

$
119

$
37

$
2,393

$
5

$
(122
)
$
2,276

Segment net income
171

35

51

25

282

6

—

288

Successor – Total assets at
June 30, 2017
$
18,257

$
2,093

$
989

$
2,381

$
23,720

$
11,182

$
(13,093
)
$
21,809

 
Gas Distribution Operations
Gas Marketing Services
Wholesale Gas Services(*)
Gas Midstream Operations
Total
All Other
Eliminations
Consolidated
 
(in millions)
Predecessor – Three Months Ended June 30, 2016:
 
 
 
 
 
 
Operating revenues
$
547

$
149

$
(95
)
$
10

$
611

$
2

$
(42
)
$
571

Segment EBIT
118

29

(112
)
(5
)
30

(55
)
1

(24
)
Predecessor – Six Months Ended 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 June 30, 2017
$
1,531

 
$
123

 
$
1,654

 
$
1,666

 
$
(12
)
Successor – Six Months Ended June 30, 2017
3,370

 
259

 
3,629

 
3,510

 
119

Predecessor – Three Months Ended June 30, 2016
$
1,061

 
$
58

 
$
1,119

 
$
1,214

 
$
(95
)
Predecessor – Six Months Ended 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 June 30, 2017
 
$
3,777

 
$
618

 
$
190

 
$
4,585

Three Months Ended June 30, 2016
 
3,748

 
446

 
185

 
4,379

 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2017
 
$
7,171

 
$
1,149

 
$
396

 
$
8,716

Six Months Ended June 30, 2016
 
7,124

 
842

 
394

 
8,360

 
Southern Company Gas' Revenues
Period
Gas
Distribution
Operations
Gas
Marketing
Services
Other
Total
 
(in millions)
Three Months Ended June 30, 2017
$
557

$
166

$
(7
)
$
716

Six Months Ended June 30, 2017
$
1,689

$
454

$
133

$
2,276