Risk Management and Hedging Activities Risk Management and Hedging Activities - Balance Sheet Location (Details) (Commodity Contract [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ (85)		$ (55)
Cash collateral receivable	28		12
Total derivatives - net basis	(57)		(43)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	18		10
Cash collateral receivable	0		0
Total derivatives - net basis	18		10
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0		0
Cash collateral receivable	0		0
Total derivatives - net basis	0		0
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(54)		(27)
Cash collateral receivable	14		0
Total derivatives - net basis	(40)		(27)
Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(49)		(38)
Cash collateral receivable	14		12
Total derivatives - net basis	(35)		(26)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	29	[1]	14	[1]
Commodity liabilities	(114)	[1]	(69)	[1]
Derivative, Fair Value, Net	(85)	[1]	(55)	[1]
Regulatory asset	85		55		121
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	28	[1]	11	[1]
Commodity liabilities	(10)	[1]	(1)	[1]
Derivative, Fair Value, Net	18	[1]	10	[1]
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0	[1]	0	[1]
Commodity liabilities	0	[1]	0	[1]
Derivative, Fair Value, Net	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1	[1]	2	[1]
Commodity liabilities	(55)	[1]	(29)	[1]
Derivative, Fair Value, Net	(54)	[1]	(27)	[1]
Not Designated as Hedging Instrument [Member] | Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0	[1]	1	[1]
Commodity liabilities	(49)	[1]	(39)	[1]
Derivative, Fair Value, Net	$ (49)	[1]	$ (38)	[1]

[1] PacifiCorp's commodity derivatives are generally included in rates and as of December 31, 2014 and 2013, a regulatory asset of $85 million and $55 million, respectively, was recorded related to the net derivative liability of $85 million and $55 million, respectively.