Derivatives And Hedging Activities (Gains And Losses On Derivative Instruments) (Details) - PGE Corporation Utility [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrealized (loss) gain - regulatory assets and liabilities	[1]	$ (6)	$ 124	$ 238
Realized loss-cost of electricity	[2]	(14)	(83)	(178)
Realized loss-cost of natural gas	[2]	(10)	(8)	(22)
Total commodity risk instruments		$ (30)	$ 33	$ 38

[1] Unrealized gains and losses on commodity risk-related derivative instruments are recorded to regulatory assets or liabilities, rather than being recorded to the 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.