Asset Retirement Oblilgations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations By Type [Table Text Block]

The following table presents the Company's ARO liabilities by asset type as of December 31 (in millions):

	2015		2014
Fossil fuel facilities	$	443	$	334
Quad Cities Station	289		265
Wind generating facilities	104		75
Offshore pipeline facilities	31		31
Solar generating facilities	12		9
Other	42		39
Total asset retirement obligations	$	921	$	753
Quad Cities Station nuclear decommissioning trust funds	$	429	$	424

Asset Retirement Obligation Disclosure [Table Text Block]

The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31 (in millions):

	2015			2014
Beginning balance	$	753		$	696
Acquisitions	—			12
Change in estimated costs	104			3
Additions	59			15
Retirements	(32		)	(8		)
Accretion	37			35
Ending balance	$	921		$	753
Reflected as:
Other current liabilities	$	92		$	66
Other long-term liabilities	829			687
Total ARO liability	$	921		$	753

PacifiCorp [Member]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligation Disclosure [Table Text Block]

The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions):

	2015			2014
Beginning balance	$	135		$	138
Change in estimated costs	62			(3		)
Additions	30			—
Retirements	(10		)	(6		)
Accretion	7			6
Ending balance	$	224		$	135
Reflected as:
Other current liabilities	$	35		$	21
Other long-term liabilities	189			114
	$	224		$	135

MidAmerican Energy Company [Member]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations By Type [Table Text Block]

The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31, (in millions):

	2015		2014
Quad Cities Station	$	289	$	265
Fossil-fueled generating facilities	160		132
Wind-powered generating facilities	82		60
Other	1		3
Total asset retirement obligations	$	532	$	460
Quad Cities Station nuclear decommissioning trust funds(1)	$	429	$	424

(1) Refer to Note 6 for a discussion of the Quad Cities Station nuclear decommissioning trust funds.

Asset Retirement Obligation Disclosure [Table Text Block]

The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31, (in millions):

	2015			2014
Beginning balance	$	460		$	430
Change in estimated costs	36			(2		)
Additions	22			11
Retirements	(9		)	—
Accretion	23			21
Ending balance	$	532		$	460
Reflected as:
Other current liabilities	$	44		$	28
Asset retirement obligations	488			432
	$	532		$	460

Nevada Power Company [Member]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations By Type [Table Text Block]

The following table presents Nevada Power's ARO liabilities by asset type as of December 31 (in millions):

	2015		2014
Waste water remediation	$	42	$	53
Evaporative ponds and dry ash landfills	27		25
Asbestos	3		3
Other	13		5
Total asset retirement obligations	$	85	$	86

Asset Retirement Obligation Disclosure [Table Text Block]

The following table reconciles the beginning and ending balances of Nevada Power's ARO liabilities for the years ended December 31 (in millions):

	2015			2014
Beginning balance	$	86		$	100
Change in estimated costs	3			(18		)
Additions	3			—
Retirements	(11		)	—
Accretion	4			4
Ending balance	$	85		$	86
Reflected as:
Other current liabilities	$	13		$	14
Other long-term liabilities	72			72
	$	85		$	86

Sierra Pacific Power Company [Member]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations By Type [Table Text Block]

The following table presents Sierra Pacific's ARO liabilities by asset type as of December 31 (in millions):

	2015		2014
Asbestos	$	4	$	5
Evaporative ponds and dry ash landfills	3		2
Other	3		4
Total asset retirement obligations	$	10	$	11

Asset Retirement Obligation Disclosure [Table Text Block]

The following table reconciles the beginning and ending balances of Sierra Pacific's ARO liabilities for the years ended December 31 (in millions):

	2015			2014
Beginning balance	$	11		$	16
Change in estimated costs	—			(6		)
Retirements	(1		)	—
Accretion	—			1
Ending balance	$	10		$	11
Reflected as:
Other current liabilities	$	—		$	3
Other long-term liabilities	10			8
	$	10		$	11