Asset Retirement Oblilgations (Tables)

12 Months Ended

Dec. 31, 2017

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):

	2017		2016
Fossil fuel facilities	$	380	$	404
Quad Cities Station	342		343
Wind generating facilities	138		124
Offshore pipeline facilities	32		33
Solar generating facilities	19		12
Other	43		38
Total asset retirement obligations	$	954	$	954
Quad Cities Station nuclear decommissioning trust funds	$	515	$	460

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):

	2017			2016
Beginning balance	$	954		$	921
Change in estimated costs	(18		)	33
Additions	21			25
Retirements	(45		)	(63		)
Accretion	42			38
Ending balance	$	954		$	954
Reflected as:
Other current liabilities	$	60		$	98
Other long-term liabilities	894			856
Total ARO liability	$	954		$	954

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):

	2017			2016
Beginning balance	$	215		$	224
Change in estimated costs	(8		)	2
Additions	6			—
Retirements	(6		)	(19		)
Accretion	8			8
Ending balance	$	215		$	215
Reflected as:
Other current liabilities	$	25		$	21
Other long-term liabilities	190			194
	$	215		$	215

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):

	2017		2016
Quad Cities Station	$	342	$	343
Fossil-fueled generating facilities	113		132
Wind-powered generating facilities	103		91
Other	1		1
Total asset retirement obligations	$	559	$	567
Quad Cities Station nuclear decommissioning trust funds(1)	$	515	$	460

(1) Refer to Note 7 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):

	2017			2016
Beginning balance	$	567		$	532
Change in estimated costs	(14		)	28
Additions	8			14
Retirements	(26		)	(32		)
Accretion	24			25
Ending balance	$	559		$	567
Reflected as:
Other current liabilities	$	31		$	57
Asset retirement obligations	528			510
	$	559		$	567

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):

	2017		2016
Waste water remediation	$	39	$	38
Evaporative ponds and dry ash landfills	11		22
Asbestos	3		4
Solar	3		2
Other	24		17
Total asset retirement obligations	$	80	$	83

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):

	2017			2016
Beginning balance	$	83		$	85
Change in estimated costs	6			4
Retirements	(13		)	(10		)
Accretion	4			4
Ending balance	$	80		$	83
Reflected as:
Other current liabilities	$	4		$	20
Other long-term liabilities	76			63
	$	80		$	83

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):

	2017		2016
Asbestos	$	5	$	4
Evaporative ponds and dry ash landfills	2		3
Other	3		3
Total asset retirement obligations	$	10	$	10

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):

	2017		2016
Beginning balance	$	10	$	10
Retirements	—		—
Ending balance	$	10	$	10
Reflected as:
Other current liabilities	$	—	$	—
Other long-term liabilities	10		10
	$	10	$	10