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Segment Information (MEC) (MidAmerican Energy Company [Member])
3 Months Ended
Mar. 31, 2013
MidAmerican Energy Company [Member]
 
Segment Reporting Information [Line Items]  
Segment Reporting Disclosure [Text Block]
(10)
Segment Information

MidAmerican Energy has identified three reportable segments: regulated electric, regulated gas and nonregulated energy. 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. The nonregulated energy segment derives most of its revenue from nonregulated retail electric and gas activities. 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,
 
2013
 
2012
Operating revenue:
 
 
 
Regulated electric
$
415

 
$
380

Regulated gas
315

 
263

Nonregulated energy
190

 
231

Total operating revenue
$
920

 
$
874

 
 
 
 
Depreciation and amortization:
 
 
 
Regulated electric
$
98

 
$
84

Regulated gas
9

 
9

Total depreciation and amortization
$
107

 
$
93

 
 

 
 

Operating income:
 
 
 
Regulated electric
$
50

 
$
48

Regulated gas
45

 
30

Nonregulated energy
11

 
14

Total operating income
$
106

 
$
92


 
As of
 
March 31,
2013
 
December 31,
2012
Total assets:
 
 
 
Regulated electric
$
9,837

 
$
9,898

Regulated gas
1,106

 
1,202

Nonregulated energy
113

 
132

Total assets
$
11,056

 
$
11,232