Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 33	$ 12
Accounts receivable, net	144	152
Unbilled revenues	76	97
Inventories	77	78
Margin deposits	33	46
Regulatory assets - current	96	144
Other current assets	105	93
Total current assets	564	622
Electric utility plant, net	4,449	4,392
Regulatory assets - noncurrent	524	524
Nuclear decommissioning trust	38	38
Non-qualified benefit plan trust	32	32
Other noncurrent assets	54	62
Total assets	5,661	5,670
Current liabilities
Accounts payable	77	98
Liabilities from price risk mangement activities - current	91	127
Short-term debt	0	17
Current portion of long-term debt	100	100
Accrued expenses and other current liabilities	192	179
Total current liabilities	460	521
Long-term debt, net of current portion	1,536	1,536
Regulatory liabilities - noncurrent	782	765
Deferred income taxes	586	588
Unfunded status of pension and postretirement plans	249	247
Non-qualified benefit plan liabilities	103	102
Asset retirement obligation	93	94
Liabilities from price risk mangement activities - noncurrent	78	73
Other noncurrent liabilities	16	14
Total liabilities	3,903	3,940
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, 2013 and December 31, 2012	0	0
Common stock, no par value, 160,000,000 shares authorized; 75,677,181 and 75,556,272 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively	841	841
Accumulated other comprehensive loss	(6)	(6)
Retained earnings	922	893
Total Portland General Electric Company shareholders' equity	1,757	1,728
Noncontrolling interests' equity	1	2
Total equity	1,758	1,730
Total liabilities and equity	$ 5,661	$ 5,670