Asset Retirement Oblilgations (Tables)

12 Months Ended

Dec. 31, 2016

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):

	2016		2015
Fossil fuel facilities	$	404	$	443
Quad Cities Station	343		289
Wind generating facilities	124		104
Offshore pipeline facilities	33		31
Solar generating facilities	12		12
Other	38		42
Total asset retirement obligations	$	954	$	921
Quad Cities Station nuclear decommissioning trust funds	$	460	$	429

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):

	2016			2015
Beginning balance	$	921		$	753
Change in estimated costs	33			104
Additions	25			59
Retirements	(63		)	(32		)
Accretion	38			37
Ending balance	$	954		$	921
Reflected as:
Other current liabilities	$	98		$	92
Other long-term liabilities	856			829
Total ARO liability	$	954		$	921

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):

	2016			2015
Beginning balance	$	224		$	135
Change in estimated costs	2			62
Additions	—			30
Retirements	(19		)	(10		)
Accretion	8			7
Ending balance	$	215		$	224
Reflected as:
Other current liabilities	$	21		$	35
Other long-term liabilities	194			189
	$	215		$	224

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):

	2016		2015
Quad Cities Station	$	343	$	289
Fossil-fueled generating facilities	132		160
Wind-powered generating facilities	91		82
Other	1		1
Total asset retirement obligations	$	567	$	532
Quad Cities Station nuclear decommissioning trust funds(1)	$	460	$	429

(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):

	2016			2015
Beginning balance	$	532		$	460
Change in estimated costs	28			36
Additions	14			22
Retirements	(32		)	(9		)
Accretion	25			23
Ending balance	$	567		$	532
Reflected as:
Other current liabilities	$	57		$	44
Asset retirement obligations	510			488
	$	567		$	532

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):

	2016		2015
Waste water remediation	$	38	$	42
Evaporative ponds and dry ash landfills	22		27
Asbestos	4		3
Solar	2		2
Other	17		11
Total asset retirement obligations	$	83	$	85

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):

	2016			2015
Beginning balance	$	85		$	86
Change in estimated costs	4			3
Additions	—			3
Retirements	(10		)	(11		)
Accretion	4			4
Ending balance	$	83		$	85
Reflected as:
Other current liabilities	$	20		$	13
Other long-term liabilities	63			72
	$	83		$	85

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):

	2016		2015
Asbestos	$	4	$	4
Evaporative ponds and dry ash landfills	3		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):

	2016		2015
Beginning balance	$	10	$	11
Retirements	—		(1		)
Ending balance	$	10	$	10
Reflected as:
Other current liabilities	$	—	$	—
Other long-term liabilities	10		10
	$	10	$	10