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

12 Months Ended

Dec. 31, 2011

MidAmerican Energy Company and Subsidiaries [Member]

Notes to Consolidated Financial Statements [Line Items]

Segment Reporting Disclosure [Text Block]

(15) Segment Information

MidAmerican Energy has identified three reportable operating 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. Refer to Note 13 for a discussion of income tax method changes and related items affecting income tax (benefit) expense for the regulated electric and gas operating segments.

The following tables provide information on an operating segment basis (in millions):

	Years Ended December 31,
	2011			2010			2009
Operating revenue:
Regulated electric	$	1,662		$	1,779		$	1,715
Regulated gas	769			852			857
Nonregulated energy	1,070			1,179			1,121
Total operating revenue	$	3,501		$	3,810		$	3,693
Depreciation and amortization:
Regulated electric	$	301		$	309		$	301
Regulated gas	35			35			34
Total depreciation and amortization	$	336		$	344		$	335
Operating income:
Regulated electric	$	294		$	319		$	331
Regulated gas	66			64			70
Nonregulated energy	69			76			67
Total operating income	$	429		$	459		$	468
Fixed charges:
Regulated electric	$	133		$	136		$	139
Regulated gas	18			18			18
Total fixed charges	$	151		$	154		$	157
Income tax expense (benefit):
Regulated electric	$	(61	)	$	(84	)	$	(76	)
Regulated gas	16			5			22
Nonregulated energy	28			30			27
Total income taxes	$	(17	)	$	(49	)	$	(27	)
Earnings on common stock:
Regulated electric	$	243		$	268		$	275
Regulated gas	36			45			35
Nonregulated energy	39			44			39
Total earnings on common stock	$	318		$	357		$	349

	As of December 31,
	2011		2010		2009
Utility construction expenditures:
Regulated electric	$	505	$	295	$	396
Regulated gas	60		42		42
Total utility construction expenditures	$	565	$	337	$	438
Total assets:
Regulated electric	$	9,016	$	7,780	$	7,430
Regulated gas	1,159		1,033		956
Nonregulated energy	135		197		221
Total assets	$	10,310	$	9,010	$	8,607