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

12 Months Ended

Dec. 31, 2012

MidAmerican Energy Company and Subsidiaries [Member]

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

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 10 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,
	2012			2011			2010
Operating revenue:
Regulated electric	$	1,694		$	1,662		$	1,779
Regulated gas	659			769			852
Nonregulated energy	889			1,070			1,179
Total operating revenue	$	3,242		$	3,501		$	3,810
Depreciation and amortization:
Regulated electric	$	356		$	301		$	309
Regulated gas	36			35			35
Total depreciation and amortization	$	392		$	336		$	344
Operating income:
Regulated electric	$	270		$	294		$	319
Regulated gas	47			66			64
Nonregulated energy	53			69			76
Total operating income	$	370		$	429		$	459
Fixed charges:
Regulated electric	$	123		$	133		$	136
Regulated gas	15			18			18
Total fixed charges	$	138		$	151		$	154
Income tax (benefit) expense:
Regulated electric	$	(129	)	$	(61	)	$	(84	)
Regulated gas	7			16			5
Nonregulated energy	23			28			30
Total income tax (benefit) expense	$	(99	)	$	(17	)	$	(49	)
Earnings on common stock:
Regulated electric	$	297		$	243		$	268
Regulated gas	28			36			45
Nonregulated energy	29			39			44
Total earnings on common stock	$	354		$	318		$	357

	Years Ended December 31,
	2012		2011		2010
Utility construction expenditures:
Regulated electric	$	588	$	505	$	295
Regulated gas	57		60		42
Total utility construction expenditures	$	645	$	565	$	337
	As of December 31,
	2012		2011		2010
Total assets:
Regulated electric	$	9,898	$	9,016	$	7,780
Regulated gas	1,202		1,159		1,033
Nonregulated energy	132		135		197
Total assets	$	11,232	$	10,310	$	9,010