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