Segment Information (MEC) (MidAmerican Energy Company and Subsidiaries [Member])

3 Months Ended

Mar. 31, 2012

MidAmerican Energy Company and Subsidiaries [Member]

Notes to Consolidated Financial Statements [Line Items]

Segment Reporting Disclosure [Text Block]

(9) 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,
	2012		2011
Operating revenue:
Regulated electric	$	380	$	377
Regulated gas	263		333
Nonregulated energy	231		269
Total operating revenue	$	874	$	979
Depreciation and amortization:
Regulated electric	$	84	$	76
Regulated gas	9		9
Total depreciation and amortization	$	93	$	85
Operating income:
Regulated electric	$	48	$	50
Regulated gas	30		45
Nonregulated energy	14		18
Total operating income	$	92	$	113

	As of
	March 31, 2012		December 31, 2011
Total assets:
Regulated electric	$	9,164	$	9,016
Regulated gas	1,088		1,159
Nonregulated energy	114		135
Total assets	$	10,366	$	10,310