Derivatives and Hedging Activities (Gains and Losses on Derivative Instruments) (Details) (PGE Corporation and Utility [Member], USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
PGE Corporation and Utility [Member]
Unrealized gain/(loss) - regulatory assets and liabilities	$ 21	[1]	$ 18	[1]	$ 158	[1]	$ (271)	[1]
Realized gain/(loss) - cost of electricity	(122)	[2]	(175)	[2]	(258)	[2]	(281)	[2]
Realized gain/(loss) - cost of natural gas	(6)	[2]	(5)	[2]	(61)	[2]	(44)	[2]
Total commodity risk instruments	$ (107)		$ (162)		$ (161)		$ (596)

[1] Unrealized gains and losses on commodity risk-related derivative instruments are recorded to regulatory assets or liabilities, rather than being recorded to the Condensed Consolidated Statements of Income. These amounts exclude the impact of cash collateral postings.

[2] These amounts are fully passed through to customers in rates. Accordingly, net income was not impacted by realized amounts on these instruments.