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Segment Information
 9 Months Ended
Sep. 30, 2018
Segment Reporting Information [Line Items]  
Segment Reporting Disclosure [Text Block]
Segment Information

The Company's reportable segments with foreign operations include Northern Powergrid, whose business is principally in the United Kingdom, BHE Transmission, whose business includes operations in Canada, and BHE Renewables, whose business includes operations in the Philippines. Intersegment eliminations and adjustments, including the allocation of goodwill, have been made. Information related to the Company's reportable segments is shown below (in millions):
 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
Operating revenue:
 
 
 
 
 
 
 
PacifiCorp
$
1,369

 
$
1,430

 
$
3,746

 
$
3,956

MidAmerican Funding
832

 
815

 
2,297

 
2,170

NV Energy
1,059

 
1,047

 
2,426

 
2,384

Northern Powergrid
233

 
221

 
757

 
685

BHE Pipeline Group
259

 
193

 
871

 
700

BHE Transmission
174

 
182

 
531

 
506

BHE Renewables
320

 
283

 
720

 
647

HomeServices
1,218

 
961

 
3,252

 
2,502

BHE and Other(1)
173

 
151

 
470

 
453

Total operating revenue
$
5,637

 
$
5,283

 
$
15,070

 
$
14,003

 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
Depreciation and amortization:
 
 
 
 
 
 
 
PacifiCorp
$
203

 
$
200

 
$
602

 
$
598

MidAmerican Funding
133

 
112

 
499

 
370

NV Energy
114

 
105

 
341

 
315

Northern Powergrid
62

 
55

 
189

 
156

BHE Pipeline Group
27

 
42

 
99

 
115

BHE Transmission
61

 
58

 
184

 
165

BHE Renewables
68

 
63

 
198

 
187

HomeServices
14

 
16

 
37

 
38

BHE and Other(1)
(1
)
 
—

 
(2
)
 
(1
)
Total depreciation and amortization
$
681

 
$
651

 
$
2,147

 
$
1,943


Operating income:
 
 
 
 
 
 
 
PacifiCorp
$
386

 
$
461

 
$
917

 
$
1,133

MidAmerican Funding
278

 
284

 
444

 
517

NV Energy
307

 
393

 
540

 
683

Northern Powergrid
102

 
106

 
360

 
346

BHE Pipeline Group
105

 
66

 
388

 
328

BHE Transmission
82

 
86

 
244

 
236

BHE Renewables
176

 
157

 
308

 
256

HomeServices
85

 
79

 
185

 
191

BHE and Other(1)
2

 
8

 
(20
)
 
(38
)
Total operating income
1,523


1,640

 
3,366


3,652

Interest expense
(453
)
 
(464
)
 
(1,380
)
 
(1,379
)
Capitalized interest
17

 
14

 
44

 
34

Allowance for equity funds
30

 
24

 
75

 
59

Interest and dividend income
27

 
32

 
85

 
85

Gains (losses) on marketable securities, net
260

 
3

 
(336
)
 
8

Other, net
19

 
(17
)
 
50

 
8

Total income before income tax expense and equity income
$
1,423


$
1,232

 
$
1,904


$
2,467

Interest expense:
 
 
 
 
 
 
 
PacifiCorp
$
96

 
$
95

 
$
288

 
$
285

MidAmerican Funding
61

 
59

 
185

 
177

NV Energy
52

 
57

 
169

 
173

Northern Powergrid
34

 
34

 
107

 
98

BHE Pipeline Group
11

 
11

 
31

 
33

BHE Transmission
42

 
45

 
127

 
125

BHE Renewables
49

 
51

 
150

 
153

HomeServices
6

 
1

 
16

 
3

BHE and Other(1)
102

 
111

 
307

 
332

Total interest expense
$
453

 
$
464

 
$
1,380


$
1,379

 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
Operating revenue by country:
 
 
 
 
 
 
 
United States
$
5,209

 
$
4,869

 
$
13,757

 
$
12,793

United Kingdom
232

 
221

 
754

 
685

Canada
174

 
182

 
531

 
506

Philippines and other
22

 
11

 
28

 
19

Total operating revenue by country
$
5,637

 
$
5,283

 
$
15,070

 
$
14,003

Income before income tax expense and equity income by country:
 
 
 
 
 
 
 
United States
$
1,290

 
$
1,113

 
$
1,501

 
$
2,065

United Kingdom
59

 
49

 
220

 
213

Canada
43

 
47

 
125

 
127

Philippines and other
31

 
23

 
58

 
62

Total income before income tax expense and equity income by country
$
1,423

 
$
1,232

 
$
1,904

 
$
2,467


 
As of
 
September 30,
 
December 31,
 
2018
 
2017
Assets:
 
 
 
PacifiCorp
$
23,501

 
$
23,086

MidAmerican Funding
19,499

 
18,444

NV Energy
14,078

 
13,903

Northern Powergrid
7,527

 
7,565

BHE Pipeline Group
5,285

 
5,134

BHE Transmission
8,863

 
9,009

BHE Renewables
8,590

 
7,687

HomeServices
2,860

 
2,722

BHE and Other(1)
1,659

 
2,658

Total assets
$
91,862

 
$
90,208


(1)
The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other, relate principally to other entities, corporate functions and intersegment eliminations.

The following table shows the change in the carrying amount of goodwill by reportable segment for the nine-month period ended September 30, 2018 (in millions):
 
 
 
 
 
 
 
 
 
BHE Pipeline Group
 
 
 
 
 
 
 
 
 
 
 
MidAmerican Funding
 
NV Energy
 
Northern Powergrid
 
 
BHE Transmission
 
BHE Renewables
 
HomeServices
 
 
 
PacifiCorp
 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
$
1,129

 
$
2,102

 
$
2,369

 
$
991

 
$
73

 
$
1,571

 
$
95

 
$
1,348

 
$
9,678

Acquisitions


 


 

 


 


 


 


 
70

 
70

Foreign currency translation


 


 

 
(24
)
 


 
(41
)
 


 


 
(65
)
September 30, 2018
$
1,129

 
$
2,102

 
$
2,369

 
$
967

 
$
73

 
$
1,530

 
$
95

 
$
1,418

 
$
9,683
MidAmerican Energy Company [Member]  
Segment Reporting Information [Line Items]  
Segment Reporting Disclosure [Text Block]
Segment Information

MidAmerican Energy has identified two reportable segments: regulated electric and regulated natural gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting natural gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by regulatory agencies; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost.

The following tables provide information on a reportable segment basis (in millions):
 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
Operating revenue:
 
 
 
 
 
 
 
Regulated electric
$
727

 
$
707

 
$
1,785

 
$
1,677

Regulated natural gas
103

 
103

 
505

 
485

Other
2

 
3

 
5

 
4

Total operating revenue
$
832

 
$
813

 
$
2,295

 
$
2,166

 
 
 
 
 
 
 
 
Operating income:
 
 
 
 
 
 
 
Regulated electric
$
278

 
$
287

 
$
392

 
$
475

Regulated natural gas
1

 
(3
)
 
52

 
41

Other
(1
)
 
—

 
—

 
—

Total operating income
278

 
284

 
444

 
516

Interest expense
(56
)
 
(54
)
 
(170
)
 
(160
)
Allowance for borrowed funds
6

 
4

 
14

 
9

Allowance for equity funds
16

 
11

 
39

 
25

Other, net
13

 
9

 
34

 
27

Income before income tax benefit
$
257

 
$
254

 
$
361

 
$
417


 
As of
 
September 30,
2018
 
December 31,
2017
Assets:
 
 
 
Regulated electric
$
16,066

 
$
14,914

Regulated natural gas
1,322

 
1,403

Other
—

 
1

Total assets
$
17,388

 
$
16,318
MidAmerican Funding, LLC and Subsidiaries [Domain]  
Segment Reporting Information [Line Items]  
Segment Reporting Disclosure [Text Block]
Segment Information

MidAmerican Funding has identified two reportable segments: regulated electric and regulated natural gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting natural gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by regulatory agencies; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost. "Other" in the tables below consists of the financial results and assets of nonregulated operations, MHC and MidAmerican Funding.

The following tables provide information on a reportable segment basis (in millions):
 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
Operating revenue:
 
 
 
 
 
 
 
Regulated electric
$
727

 
$
707

 
$
1,785

 
$
1,677

Regulated natural gas
103

 
103

 
505

 
485

Other
2

 
5

 
7

 
8

Total operating revenue
$
832

 
$
815

 
$
2,297

 
$
2,170

 
 
 
 
 
 
 
 
Operating income:
 
 
 
 
 
 
 
Regulated electric
$
278

 
$
287

 
$
392

 
$
475

Regulated natural gas
1

 
(3
)
 
52

 
41

Other
(1
)
 
—

 
—

 
1

Total operating income
278

 
284

 
444

 
517

Interest expense
(61
)
 
(59
)
 
(185
)
 
(177
)
Allowance for borrowed funds
6

 
4

 
14

 
9

Allowance for equity funds
16

 
11

 
39

 
25

Other, net
12

 
10

 
35

 
28

Income before income tax benefit
$
251

 
$
250

 
$
347

 
$
402


 
As of
 
September 30,
2018
 
December 31,
2017
Assets(1):
 
 
 
Regulated electric
$
17,257

 
$
16,105

Regulated natural gas
1,401

 
1,482

Other
13

 
34

Total assets
$
18,671

 
$
17,621

(1)
Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.
Sierra Pacific Power Company [Member]  
Segment Reporting Information [Line Items]  
Segment Reporting Disclosure [Text Block]
Segment Information

Sierra Pacific has identified two reportable operating segments: regulated electric and regulated natural gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting natural gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by the PUCN; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance.

The following tables provide information on a reportable segment basis (in millions):
 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
Operating revenue:
 
 
 
 
 
 
 
Regulated electric
$
225

 
$
215

 
$
575

 
$
534

Regulated natural gas
14

 
15

 
74

 
66

Total operating revenue
$
239

 
$
230

 
$
649

 
$
600

 
 
 
 
 
 
 
 
Operating income:
 
 
 
 
 
 
 
Regulated electric
$
56

 
$
71

 
$
111

 
$
141

Regulated natural gas
—

 
3

 
11

 
15

Total operating income
56

 
74

 
122

 
156

Interest expense
(12
)
 
(11
)
 
(33
)
 
(33
)
Allowance for borrowed funds
—

 
1

 
1

 
1

Allowance for equity funds
1

 
1

 
3

 
2

Other, net
3

 
3

 
8

 
5

Income before income tax expense
$
48

 
$
68

 
$
101

 
$
131


 
As of
 
September 30,
 
December 31,
 
2018
 
2017
Assets:
 
 
 
Regulated electric
$
3,131

 
$
3,103

Regulated natural gas
300

 
300

Regulated common assets(1)
85

 
10

Total assets
$
3,516

 
$
3,413


(1)
Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.