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Segment and Related Information (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017 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, 2018:
 
 
 
 
 
 
 
Operating revenues
$
4,124

$
555

$
(114
)
$
4,565

$
730

$
381

$
(49
)
$
5,627

Segment net income (loss)(a)(b)(c)
(48
)
22

—

(26
)
(31
)
(100
)
3

(154
)
Six Months Ended June 30, 2018:
 
 
 


 
 
 
Operating revenues
$
8,104

$
1,064

$
(220
)
$
8,948

$
2,369

$
782

$
(100
)
$
11,999

Segment net income (loss)(a)(b)(c)(d)
563

143

—

706

248

(174
)
4

784

At June 30, 2018:
 
 
 
 
 
 
 
 
Goodwill
$
—

$
2

$
—

$
2

$
5,015

$
298

$
—

$
5,315

Total assets
73,634

15,428

(313
)
88,749

22,112

3,707

(1,791
)
112,777

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)(e)
(1,010
)
151

—

(859
)
288

(152
)
—

(723
)
At December 31, 2017:
 
 
 
 
 
 
 
 
Goodwill
$
—

$
2

$
—

$
2

$
5,967

$
299

$
—

$
6,268

Total assets
72,204

15,206

(325
)
87,085

22,987

2,552

(1,619
)
111,005

(a)
Attributable to Southern Company.
(b)
Segment net income (loss) for the traditional electric operating companies includes pre-tax charges for estimated losses on plants under construction of $1.1 billion ($0.8 billion after tax) and $3.0 billion ($2.1 billion after tax) for the three months ended June 30, 2018 and 2017, respectively, and $1.1 billion ($0.8 billion after tax) and $3.1 billion ($2.2 billion after tax) for the six months ended June 30, 2018 and 2017, respectively. See Note 3 to the financial statements of Southern Company under "Kemper County Energy Facility" in Item 8 of the Form 10-K and Note (B) under "Nuclear Construction" and "Kemper County Energy Facility" for additional information.
(c)
Segment net income (loss) for Southern Power includes a pre-tax impairment charge of $119 million ($89 million after tax) for the three and six months ended June 30, 2018 related to the pending sale of Southern Power's Florida Plants. See Note (J) under "Southern Power – Sale of Florida Plants" for additional information.
(d)
Segment net income (loss) for Southern Company Gas includes a goodwill impairment charge of $42 million for the six months ended June 30, 2018 related to the sale of Pivotal Home Solutions. See Note (J) under "Southern Company Gas – Sale of Pivotal Home Solutions" for additional information.
(e)
Segment net income (loss) for the traditional electric operating companies 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 3 to the financial statements of Southern Company under "Regulatory Matters – Gulf Power – Retail Base Rate Cases" in Item 8 of the Form 10-K for additional information.
Business segment financial data for the three and six months ended June 30, 2018 and 2017 was as follows:
 
Gas Distribution Operations(a)
Gas Marketing Services(b)(c)
Wholesale Gas Services(d)
Gas Midstream Operations
Total
All Other
Eliminations
Consolidated
 
(in millions)
Three Months Ended June 30, 2018:
 
 
 
 
 
 
Operating revenues
$
643

$
89

$
(16
)
$
18

$
734

$
1

$
(5
)
$
730

Segment net income
68

(76
)
(21
)
14

(15
)
(16
)
—

(31
)
Six Months Ended June 30, 2018:
 
 
 
 
 
 
Operating revenues
1,856

359

150

40

2,405

2

(38
)
2,369

Segment net income
216

(63
)
83

38

274

(26
)
—

248

Total assets at June 30, 2018:
18,654

1,610

818

2,269

23,351

11,544

(12,783
)
22,112

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

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

Total assets at December 31, 2017:
19,358

2,147

1,096

2,241

24,842

12,184

(14,039
)
22,987

(a)
Operating revenues for the three gas distribution operations dispositions were $70 million and $66 million for the three months ended June 30, 2018 and 2017, respectively, and $237 million and $224 million for the six months ended June 30, 2018 and 2017, respectively. See Note (J) under "Southern Company Gas" for additional information.
(b)
Operating revenues for the gas marketing services disposition were $24 million and $32 million for the three months ended June 30, 2018 and 2017, respectively, and $55 million and $63 million for the six months ended June 30, 2018 and 2017, respectively. See Note (J) under "Southern Company Gas" for additional information.
(c)
Segment net income for gas marketing services includes a loss on disposition of $36 million for the three and six months ended June 30, 2018 and a goodwill impairment charge of $42 million for the six months ended June 30, 2018 recorded in contemplation of the sale of Pivotal Home Solutions. See Note (J) under "Southern Company Gas" for additional information.
(d)
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)
Three Months Ended June 30, 2018
$
1,336

$
102

$
1,438

$
1,454

$
(16
)
Three Months Ended June 30, 2017
1,531

123

1,654

1,666

(12
)
Six Months Ended June 30, 2018
$
3,274

$
269

$
3,543

$
3,393

$
150

Six Months Ended June 30, 2017
3,370

259

3,629

3,510

119
Financial Data for Products and Services
Products and Services
 
Electric Utilities' Revenues
Period
Retail
Wholesale
Other
Total
 
(in millions)
Three Months Ended June 30, 2018
$
3,740

$
611

$
214

$
4,565

Three Months Ended June 30, 2017
3,777

618

190

4,585

 
 
 
 
 
Six Months Ended June 30, 2018
$
7,308

$
1,230

$
410

$
8,948

Six Months Ended June 30, 2017
7,171

1,149

396

8,716

 
Southern Company Gas' Revenues
Period
Gas
Distribution
Operations
Gas
Marketing
Services
Other
Total
 
(in millions)
Three Months Ended June 30, 2018
$
638

$
89

$
3

$
730

Three Months Ended June 30, 2017
557

166

(7
)
716

 
 
 
 
 
Six Months Ended June 30, 2018
$
1,838

$
359

$
172

$
2,369

Six Months Ended June 30, 2017
1,689

454

133

2,276