Unaudited Quarterly Operating Results Unaudited Quarterly Operating Results (Notes)

12 Months Ended

Dec. 31, 2016

MidAmerican Energy Company [Member]

Quarterly Operating Results [Line Items]

Quarterly Financial Information [Text Block]

Unaudited Quarterly Operating Results

	2016
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	(In millions)
Operating revenue	$	625	$	584	$	795	$	621
Operating income	100		139		284		42
Net income	76		131		320		15
	2015
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	(In millions)
Operating revenue	$	722	$	572	$	680	$	528
Operating income	100		112		208		29
Income from continuing operations	90		126		233		(3		)
Income on discontinued operations	4		5		1		6
Net income	94		131		234		3

Quarterly data reflect seasonal variations common to a Midwest utility.

MidAmerican Funding, LLC and Subsidiaries [Domain]

Quarterly Operating Results [Line Items]

Quarterly Financial Information [Text Block]

Unaudited Quarterly Operating Results

	2016
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	(In millions)
Operating revenue	$	626	$	585	$	797	$	623
Operating income	100		140		284		42
Net income	73		127		318		14

	2015
	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
	(In millions)
Operating revenue	$	727	$	576	$	681	$	531
Operating income	101		112		209		29
Income from continuing operations	95		124		230		(7		)
Income on discontinued operations	4		5		1		6
Net income	99		129		231		(1		)

Quarterly data reflect seasonal variations common to a Midwest utility.

Nevada Power Company [Member]

Quarterly Operating Results [Line Items]

Quarterly Financial Information [Text Block]

Unaudited Quarterly Operating Results (in millions)

	Three-Month Periods Ended
	March 31,		June 30,		September 30,		December 31,
	2016		2016		2016		2016
Operating revenues	$	399	$	525	$	766	$	393
Operating income	46		141		324		69
Net income	3		66		188		22
	Three-Month Periods Ended
	March 31,		June 30,		September 30,		December 31,
	2015		2015		2015		2015
Operating revenues	$	459	$	607	$	878	$	458
Operating income	74		136		329		74
Net income	24		60		187		17

Sierra Pacific Power Company [Member]

Quarterly Operating Results [Line Items]

Quarterly Financial Information [Text Block]

Unaudited Quarterly Operating Results (in millions)

	Three-Month Periods Ended
	March 31,		June 30,		September 30,		December 31,
	2016		2016		2016		2016
Regulated electric operating revenue	$	170	$	162	$	207	$	163
Regulated natural gas operating revenue	47		19		15		29
Operating income	41		28		69		42
Net income	17		10		38		19
	Three-Month Periods Ended
	March 31,		June 30,		September 30,		December 31,
	2015		2015		2015		2015
Regulated electric operating revenue	$	196	$	201	$	228	$	185
Regulated natural gas operating revenue	50		26		18		43
Operating income	43		37		66		38
Net income	19		16		33		15