Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 91	$ 12
Accounts receivable, net	137	152
Unbilled revenues	67	97
Inventories	72	78
Margin deposits	36	46
Regulatory assets - current	99	144
Other current assets	63	93
Total current assets	565	622
Electric utility plant, net	4,659	4,392
Regulatory assets - noncurrent	504	524
Nuclear decommissioning trust	82	38
Non-qualified benefit plan trust	34	32
Other noncurrent assets	47	62
Total assets	5,891	5,670
Current liabilities
Accounts payable	99	98
Liabilities from price risk mangement activities - current	89	127
Short-term debt	0	17
Current portion of long-term debt	0	100
Accrued expenses and other current liabilities	192	179
Total current liabilities	380	521
Long-term debt, net of current portion	1,761	1,536
Regulatory liabilities - noncurrent	852	765
Deferred income taxes	565	588
Unfunded status of pension and postretirement plans	253	247
Non-qualified benefit plan liabilities	103	102
Asset retirement obligation	96	94
Liabilities from price risk mangement activities - noncurrent	71	73
Other noncurrent liabilities	17	14
Total liabilities	4,098	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 September 30, 2013 and December 31, 2012	0	0
Common stock, no par value, 160,000,000 shares authorized; 78,067,299 and 75,556,272 shares issued and outstanding as of September 30, 2013 and December 31, 2012, respectively	910	841
Accumulated other comprehensive loss	(6)	(6)
Retained earnings	888	893
Total Portland General Electric Company shareholders' equity	1,792	1,728
Noncontrolling interests' equity	1	2
Total equity	1,793	1,730
Total liabilities and equity	$ 5,891	$ 5,670