Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 8	$ 6
Accounts receivable, net	156	144
Unbilled revenues	79	101
Inventories	81	71
Margin deposits	98	80
Regulatory assets - current	232	216
Deferred income tax assets	39	33
Other current assets	87	65
Total current assets	780	716
Electric utility plant, net	4,288	4,285
Regulatory assets - noncurrent	588	594
Nuclear decommissioning trust	36	37
Non-qualified benefit plan trust	36	36
Other noncurrent assets	61	65
Total assets	5,789	5,733
Current liabilities
Accounts payable	80	111
Liabilities from price risk mangement activities - current	242	216
Short-term debt	0	30
Current portion of long-term debt	100	100
Accrued expenses and other current liabilities	166	157
Total current liabilities	588	614
Long-term debt, net of current portion	1,635	1,635
Regulatory liabilities - noncurrent	742	720
Deferred income taxes	557	529
Liabilities from price risk mangement activities - noncurrent	173	172
Unfunded status of pension and postretirement plans	197	195
Non-qualified benefit plan liabilities	102	101
Other noncurrent liabilities	100	101
Total liabilities	4,094	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 March 31, 2012 and December 31, 2011	0	0
Common stock, no par value, 160,000,000 shares authorized; 75,504,580 and 75,362,956 shares issued and outstanding as of March 31, 2012 and December 31, 2011, respectively	836	836
Accumulated other comprehensive loss	(6)	(6)
Retained earnings	862	833
Total Portland General Electric Company shareholders' equity	1,692	1,663
Noncontrolling interests' equity	3	3
Total equity	1,695	1,666
Total liabilities and equity	$ 5,789	$ 5,733