Risk Management and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):

	Other					Other			Other
	Current			Other		Current			Long-term
	Assets			Assets		Liabilities			Liabilities			Total
As of September 30, 2015
Not designated as hedging contracts(1):
Commodity assets	$	9		$	—	$	2		$	—		$	11
Commodity liabilities	(2		)	—		(51		)	(90		)	(143		)
Total	7			—		(49		)	(90		)	(132		)
Total derivatives	7			—		(49		)	(90		)	(132		)
Cash collateral receivable	—			—		16			54			70
Total derivatives - net basis	$	7		$	—	$	(33	)	$	(36	)	$	(62	)
As of December 31, 2014
Not designated as hedging contracts(1):
Commodity assets	$	28		$	—	$	1		$	—		$	29
Commodity liabilities	(10		)	—		(55		)	(49		)	(114		)
Total	18			—		(54		)	(49		)	(85		)
Total derivatives	18			—		(54		)	(49		)	(85		)
Cash collateral receivable	—			—		14			14			28
Total derivatives - net basis	$	18		$	—	$	(40	)	$	(35	)	$	(57	)

(1) PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2015 and December 31, 2014, a regulatory asset of $128 million and $85 million, respectively, was recorded related to the net derivative liability of $132 million and $85 million, respectively.

Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts [Table Text Block]

The following table reconciles the beginning and ending balances of PacifiCorp's regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in regulatory assets, as well as amounts reclassified to earnings (in millions):

	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2015			2014			2015			2014
Beginning balance	$	99		$	—		$	85		$	55
Changes in fair value recognized in regulatory assets	38			34			65			(15		)
Net gains (losses) reclassified to operating revenue	1			2			29			(9		)
Net losses reclassified to energy costs	(10		)	(7		)	(51		)	(2		)
Ending balance	$	128		$	29		$	128		$	29

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):

	Unit of	September 30,		December 31,
	Measure	2015		2014
Electricity sales	Megawatt hours	(1	)	(1	)
Natural gas purchases	Decatherms	111		113
Fuel oil purchases	Gallons	3		3