Derivatives (Gains And Losses On Derivative Instruments) (Details) (PGE Corporation And Utility [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
PGE Corporation And Utility [Member]
Unrealized (loss) gain-regulatory assets and liabilities	$ (54)	[1]	$ 137	[1]
Realized loss - cost of electricity	(151)	[2]	(136)	[2]
Realized loss - cost of natural gas	(22)	[2]	(55)	[2]
Total commodity risk instruments	$ (227)		$ (54)

[1] Unrealized gains and losses on derivatives are deferred 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 recovered from customers in rates. Accordingly, net income was not impacted by realized amounts on these instruments.