Risk Management and Hedging Activities Risk Management and Hedging Activities - Balance Sheet Location (Details) (Commodity Contract [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 0			$ (55)
Cash collateral, net receivable, offset against derivative positions	0			12
Derivative Assets (Liabilities), at Fair Value, Net	0			(43)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	12			10
Cash collateral, net receivable, offset against derivative positions	0			0
Derivative Assets (Liabilities), at Fair Value, Net	12			10
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	3			0
Cash collateral, net receivable, offset against derivative positions	0			0
Derivative Assets (Liabilities), at Fair Value, Net	3			0
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(9)			(27)
Cash collateral, net receivable, offset against derivative positions	0			0
Derivative Assets (Liabilities), at Fair Value, Net	(9)			(27)
Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	(6)			(38)
Cash collateral, net receivable, offset against derivative positions	0			12
Derivative Assets (Liabilities), at Fair Value, Net	(6)			(26)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	23	[1]		14	[1]
Commodity liabilities	(23)	[1]		(69)	[1]
Derivative, Fair Value, Net	0	[1]		(55)	[1]
Regulatory asset	0		27	55		85	82	121
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	17	[1]		11	[1]
Commodity liabilities	(5)	[1]		(1)	[1]
Derivative, Fair Value, Net	12	[1]		10	[1]
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	4	[1]		0	[1]
Commodity liabilities	(1)	[1]		0	[1]
Derivative, Fair Value, Net	3	[1]		0	[1]
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	2	[1]		2	[1]
Commodity liabilities	(11)	[1]		(29)	[1]
Derivative, Fair Value, Net	(9)	[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	(6)	[1]		(39)	[1]
Derivative, Fair Value, Net	$ (6)	[1]		$ (38)	[1]

[1] PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2014 and December 31, 2013, a regulatory asset of $- million and $55 million, respectively, was recorded related to the net derivative liability of $- million and $55 million, respectively.