Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Asset Retirement Obligations [Abstract]
Damages sought in USDOE claim	$ 9		$ 112
PGE share of claim sought	6
Asset Retirement Obligation Increase related to Boardman plant					20
Asset Retirement Obligation Rate Recovery related to Trojan Plant			4
Loss Contingency, Damages Awarded, Value		70
Proceeds from Legal Settlements		44	44	0	0
Asset Retirement Obligation, Liabilities Incurred			$ 4	$ 0	$ 1