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Segment and Related Information (Tables)
 9 Months Ended
Sep. 30, 2018
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, 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 September 30, 2018:
 
 
 
 
 
 
 
Operating revenues
$
5,014

$
635

$
(140
)
$
5,509

$
492

$
202

$
(44
)
$
6,159

Segment net income (loss)(a)(b)(c)(d)
1,148

92

—

1,240

46

(119
)
(3
)
1,164

Nine Months Ended September 30, 2018:
 
 
 


 
 
 
Operating revenues
$
13,117

$
1,699

$
(360
)
$
14,456

$
2,861

$
984

$
(143
)
$
18,158

Segment net income (loss)(a)(b)(c)(d)
1,711

235

—

1,946

294

(292
)
—

1,948

At September 30, 2018:
 
 
 
 
 
 
 
 
Goodwill
$
—

$
2

$
—

$
2

$
5,015

$
298

$
—

$
5,315

Total assets
75,069

15,355

(322
)
90,102

20,398

3,086

(1,869
)
111,717

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)(e)
—

276

—

276

303

(232
)
—

347

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 million ($1 million after tax) and $34 million ($21 million after tax) for the three months ended September 30, 2018 and 2017, respectively, and $1.1 billion ($0.8 billion after tax) and $3.2 billion ($2.2 billion after tax) for the nine months ended September 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 pre-tax impairment charges of $36 million ($27 million after tax) and $155 million ($116 million after tax) for the three and nine months ended September 30, 2018, respectively. See Note (J) under "Southern Power – Development Projects" and " – Sale of Florida Plants" for additional information.
(d)
Segment net income (loss) for Southern Company Gas includes a net gain on dispositions of $353 million ($40 million gain after tax) and $317 million ($35 million loss after tax) for the three and nine months ended September 30, 2018, respectively, related to the Southern Company Gas Dispositions and a goodwill impairment charge of $42 million for the nine months ended September 30, 2018 related to the sale of Pivotal Home Solutions. See Note (J) under "Southern Company Gas" 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 nine months ended September 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 nine months ended September 30, 2018 and 2017 was as follows:
 
Gas Distribution Operations(a)(c)
Gas Marketing Services(b)(c)
Wholesale Gas Services(d)
Gas Midstream Operations
Total
All Other
Eliminations
Consolidated
 
(in millions)
Three Months Ended September 30, 2018:
 
 
 
 
 
 
Operating revenues
$
441

$
44

$
(8
)
$
20

$
497

$
1

$
(6
)
$
492

Segment net income (loss)
74

(8
)
(18
)
16

64

(18
)
—

46

Nine Months Ended September 30, 2018:
 
 
 
 
 
 
Operating revenues
2,297

403

142

60

2,902

3

(44
)
2,861

Segment net income (loss)
290

(71
)
65

54

338

(44
)
—

294

Total assets at September 30, 2018:
16,850

1,522

855

2,297

21,524

10,146

(11,272
)
20,398

Three Months Ended September 30, 2017:
 
 
 
 
 
 
Operating revenues
$
472

$
143

$
(24
)
$
16

$
607

$
2

$
(44
)
$
565

Segment net income (loss)
52

1

(23
)
14

44

(29
)
—

15

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

597

95

53

3,000

7

(166
)
2,841

Segment net income (loss)
223

36

28

38

325

(22
)
—

303

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 $8 million and $50 million for the three months ended September 30, 2018 and 2017, respectively, and $245 million and $274 million for the nine months ended September 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 $32 million for the three months ended September 30, 2017 and $55 million and $95 million for the nine months ended September 30, 2018 and 2017, respectively. See Note (J) under "Southern Company Gas" for additional information.
(c)
Segment net income for gas distribution operations includes a gain on dispositions of $351 million ($38 million after tax) for the three and nine months ended September 30, 2018. Segment net income for gas marketing services includes a gain on disposition of $2 million ($2 million after tax) for the three months ended September 30, 2018 and a loss on disposition of $34 million ($73 million loss after tax) and a goodwill impairment charge of $42 million for the nine months ended September 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 September 30, 2018
$
1,573

$
82

$
1,655

$
1,663

$
(8
)
Three Months Ended September 30, 2017
1,411

103

1,514

1,538

(24
)
Nine Months Ended September 30, 2018
$
4,847

$
352

$
5,199

$
5,057

$
142

Nine Months Ended September 30, 2017
4,781

362

5,143

5,048

95
Financial Data for Products and Services
Products and Services
 
Electric Utilities' Revenues
Period
Retail
Wholesale
Other
Total
 
(in millions)
Three Months Ended September 30, 2018
$
4,605

$
693

$
211

$
5,509

Three Months Ended September 30, 2017
4,615

718

190

5,523

 
 
 
 
 
Nine Months Ended September 30, 2018
$
11,913

$
1,923

$
620

$
14,456

Nine Months Ended September 30, 2017
11,786

1,867

586

14,239

 
Southern Company Gas' Revenues
Period
Gas
Distribution
Operations
Gas
Marketing
Services
Other
Total
 
(in millions)
Three Months Ended September 30, 2018
$
438

$
44

$
10

$
492

Three Months Ended September 30, 2017
430

143

(8
)
565

Nine Months Ended September 30, 2018
$
2,276

$
403

$
182

$
2,861

Nine Months Ended September 30, 2017
2,119

597

125

2,841