Asset Retirement Oblilgations (Tables)

12 Months Ended

Dec. 31, 2018

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):

	2018		2017
Fossil fuel facilities	$	371	$	380
Quad Cities Station	345		342
Wind generating facilities	174		138
Offshore pipeline facilities	33		32
Solar generating facilities	20		19
Other	42		43
Total asset retirement obligations	$	985	$	954
Quad Cities Station nuclear decommissioning trust funds	$	504	$	515

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):

	2018			2017
Beginning balance	$	954		$	954
Change in estimated costs	10			(18		)
Additions	28			21
Retirements	(45		)	(45		)
Accretion	38			42
Ending balance	$	985		$	954
Reflected as:
Other current liabilities	$	43		$	60
Other long-term liabilities	942			894
Total ARO liability	$	985		$	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):

	2018			2017
Beginning balance	$	215		$	215
Change in estimated costs	9			(8		)
Additions	—			6
Retirements	(5		)	(6		)
Accretion	8			8
Ending balance	$	227		$	215
Reflected as:
Other current liabilities	$	21		$	25
Other long-term liabilities	206			190
	$	227		$	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):

	2018		2017
Quad Cities Station	$	345	$	342
Fossil-fueled generating facilities	93		113
Wind-powered generating facilities	123		103
Other	1		1
Total asset retirement obligations	$	562	$	559
Quad Cities Station nuclear decommissioning trust funds(1)	$	504	$	515

(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):

	2018			2017
Beginning balance	$	559		$	567
Change in estimated costs	(10		)	(14		)
Additions	17			8
Retirements	(28		)	(26		)
Accretion	24			24
Ending balance	$	562		$	559
Reflected as:
Other current liabilities	$	10		$	31
Asset retirement obligations	552			528
	$	562		$	559

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):

	2018		2017
Waste water remediation	$	37	$	39
Evaporative ponds and dry ash landfills	12		11
Asbestos	5		3
Solar	2		3
Other	27		24
Total asset retirement obligations	$	83	$	80

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):

	2018			2017
Beginning balance	$	80		$	83
Change in estimated costs	11			6
Retirements	(11		)	(13		)
Accretion	3			4
Ending balance	$	83		$	80
Reflected as:
Other current liabilities	$	13		$	4
Other long-term liabilities	70			76
	$	83		$	80

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):

	2018		2017
Asbestos	$	5	$	5
Evaporative ponds and dry ash landfills	2		2
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):

	2018		2017
Beginning balance	$	10	$	10
Retirements	—		—
Ending balance	$	10	$	10
Reflected as:
Other current liabilities	$	—	$	—
Other long-term liabilities	10		10
	$	10	$	10