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Segment Information
 3 Months Ended
Mar. 31, 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
 
Ended March 31,
 
2018
 
2017
Operating revenue:
 
 
 
PacifiCorp
$
1,184

 
$
1,281

MidAmerican Funding
747

 
696

NV Energy
617

 
584

Northern Powergrid
278

 
245

BHE Pipeline Group
376

 
315

BHE Transmission
180

 
166

BHE Renewables
154

 
144

HomeServices
761

 
585

BHE and Other(1)
143

 
150

Total operating revenue
$
4,440

 
$
4,166

 
Three-Month Periods
 
Ended March 31,
 
2018
 
2017
Depreciation and amortization:
 
 
 
PacifiCorp
$
202

 
$
196

MidAmerican Funding
158

 
117

NV Energy
113

 
104

Northern Powergrid
63

 
49

BHE Pipeline Group
42

 
30

BHE Transmission
62

 
54

BHE Renewables
64

 
61

HomeServices
12

 
12

BHE and Other(1)
—

 
(1
)
Total depreciation and amortization
$
716

 
$
622


Operating income:
 
 
 
PacifiCorp
$
247

 
$
339

MidAmerican Funding
79

 
102

NV Energy
89

 
98

Northern Powergrid
147

 
140

BHE Pipeline Group
226

 
208

BHE Transmission
81

 
77

BHE Renewables
28

 
15

HomeServices
(8
)
 
2

BHE and Other(1)
(18
)
 
(14
)
Total operating income
871


967

Interest expense
(466
)
 
(458
)
Capitalized interest
12

 
10

Allowance for equity funds
21

 
17

Interest and dividend income
26

 
26

Realized and unrealized (loss) gain on marketable securities, net
(209
)
 
3

Other, net
30

 
26

Total income before income tax expense and equity income
$
285


$
591

 
Interest expense:
 
 
 
PacifiCorp
$
96

 
$
95

MidAmerican Funding
63

 
59

NV Energy
58

 
58

Northern Powergrid
37

 
31

BHE Pipeline Group
10

 
12

BHE Transmission
43

 
41

BHE Renewables
52

 
50

HomeServices
4

 
1

BHE and Other(1)
103

 
111

Total interest expense
$
466


$
458

 
 
Three-Month Periods
 
Ended March 31,
 
2018
 
2017
Operating revenue by country:
 
 
 
United States
$
3,978

 
$
3,747

United Kingdom
277

 
245

Canada
180

 
166

Philippines and other
5

 
8

Total operating revenue by country
$
4,440

 
$
4,166

 
Income before income tax expense and equity income by country:
 
 
 
United States
$
118

 
$
423

United Kingdom
112

 
102

Canada
41

 
42

Philippines and other
14

 
24

Total income before income tax expense and equity income by country
$
285

 
$
591


 
As of
 
March 31,
 
December 31,
 
2018
 
2017
Assets:
 
 
 
PacifiCorp
$
22,989

 
$
23,086

MidAmerican Funding
18,707

 
18,444

NV Energy
13,911

 
13,903

Northern Powergrid
7,897

 
7,565

BHE Pipeline Group
5,252

 
5,134

BHE Transmission
8,762

 
9,009

BHE Renewables
7,790

 
7,687

HomeServices
2,739

 
2,722

BHE and Other(1)
2,865

 
2,658

Total assets
$
90,912

 
$
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 three-month period ended March 31, 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

Foreign currency translation
—

 
—

 
—

 
26

 
—

 
(39
)
 
—

 
—

 
(13
)
March 31, 2018
$
1,129

 
$
2,102

 
$
2,369

 
$
1,017

 
$
73

 
$
1,532

 
$
95

 
$
1,348

 
$
9,665
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 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 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 gas owned by others through its distribution system. Pricing for regulated electric and regulated 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
 
Ended March 31,
 
2018
 
2017
Operating revenue:
 
 
 
Regulated electric
$
469

 
$
433

Regulated gas
275

 
262

Other
2

 
—

Total operating revenue
$
746

 
$
695

 
 
 
 
Operating income:
 
 
 
Regulated electric
$
36

 
$
63

Regulated gas
43

 
39

Total operating income
$
79

 
$
102

Interest expense
(58
)
 
(53
)
Allowance for borrowed funds
4

 
2

Allowance for equity funds
10

 
6

Other, net
9

 
11

Income before income tax benefit
$
44

 
$
68


 
As of
 
March 31,
2018
 
December 31,
2017
Assets:
 
 
 
Regulated electric
$
15,254

 
$
14,914

Regulated gas
1,323

 
1,403

Other
3

 
1

Total assets
$
16,580

 
$
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 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 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 gas owned by others through its distribution system. Pricing for regulated electric and regulated 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
 
Ended March 31,
 
2018
 
2017
Operating revenue:
 
 
 
Regulated electric
$
469

 
$
433

Regulated gas
275

 
262

Other
3

 
1

Total operating revenue
$
747

 
$
696

 
 
 
 
Operating income:
 
 
 
Regulated electric
$
36

 
$
63

Regulated gas
43

 
39

Total operating income
79

 
102

Interest expense
(63
)
 
(59
)
Allowance for borrowed funds
4

 
2

Allowance for equity funds
10

 
6

Other, net
10

 
11

Income before income tax benefit
$
40

 
$
62


 
As of
 
March 31,
2018
 
December 31,
2017
Assets(1):
 
 
 
Regulated electric
$
16,445

 
$
16,105

Regulated gas
1,402

 
1,482

Other
32

 
34

Total assets
$
17,879

 
$
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
 
Ended March 31,
 
2018
 
2017
Operating revenue:
 
 
 
Regulated electric
$
181

 
$
159

Regulated gas
41

 
34

Total operating revenue
$
222

 
$
193

 
 
 
 
Operating income:
 
 
 
Regulated electric
$
37

 
$
36

Regulated gas
10

 
10

Total operating income
47

 
46

Interest expense
(10
)
 
(11
)
Allowance for equity funds
1

 
1

Other, net
2

 
1

Income before income tax expense
$
40

 
$
37


 
 
 
As of
 
 
 
 
 
March 31,
 
December 31,
 
 
 
 
 
2018
 
2017
Assets:
 
 
 
 
 
 
 
Regulated electric
 
 
 
 
$
3,092

 
$
3,103

Regulated gas
 
 
 
 
307

 
300

Regulated common assets(1)
 
 
 
 
40

 
10

Total assets
 
 
 
 
$
3,439

 
$
3,413


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