Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 156	$ 6
Accounts receivable, net	129	144
Unbilled revenues	75	101
Inventories	78	71
Margin deposits	53	80
Regulatory assets - current	154	216
Deferred income tax assets	40	33
Other current assets	99	65
Total current assets	784	716
Electric utility plant, net	4,351	4,285
Regulatory assets - noncurrent	490	594
Nuclear decommissioning trust	37	37
Non-qualified benefit plan trust	32	36
Other noncurrent assets	63	65
Total assets	5,757	5,733
Current liabilities
Accounts payable	76	111
Liabilities from price risk mangement activities - current	147	216
Short-term debt	0	30
Current portion of long-term debt	200	100
Accrued expenses and other current liabilities	225	157
Total current liabilities	648	614
Long-term debt, net of current portion	1,536	1,635
Regulatory liabilities - noncurrent	760	720
Deferred income taxes	598	529
Liabilities from price risk mangement activities - noncurrent	90	172
Unfunded status of pension and postretirement plans	201	195
Non-qualified benefit plan liabilities	102	101
Other noncurrent liabilities	103	101
Total liabilities	4,038	4,067
Commitments and contingencies (see notes)
Portland General Electric Company shareholders' equity:
Preferred stock, no par value, 30,000,000 shares authorized; none issued and outstanding as of September 30, 2012 and December 31, 2011	0	0
Common stock, no par value, 160,000,000 shares authorized; 75,534,386 and 75,362,956 shares issued and outstanding as of September 30, 2012 and December 31, 2011, respectively	838	836
Accumulated other comprehensive loss	(6)	(6)
Retained earnings	885	833
Total Portland General Electric Company shareholders' equity	1,717	1,663
Noncontrolling interests' equity	2	3
Total equity	1,719	1,666
Total liabilities and equity	$ 5,757	$ 5,733