Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 119	$ 12
Accounts receivable, net	137	152
Unbilled revenues	73	97
Inventories	72	78
Margin deposits	34	46
Regulatory assets - current	114	144
Other current assets	78	93
Total current assets	627	622
Electric utility plant, net	4,532	4,392
Regulatory assets - noncurrent	519	524
Nuclear decommissioning trust	37	38
Non-qualified benefit plan trust	32	32
Other noncurrent assets	49	62
Total assets	5,796	5,670
Current liabilities
Accounts payable	107	98
Liabilities from price risk mangement activities - current	103	127
Short-term debt	0	17
Current portion of long-term debt	50	100
Accrued expenses and other current liabilities	175	179
Total current liabilities	435	521
Long-term debt, net of current portion	1,686	1,536
Regulatory liabilities - noncurrent	796	765
Deferred income taxes	571	588
Unfunded status of pension and postretirement plans	251	247
Non-qualified benefit plan liabilities	103	102
Asset retirement obligation	96	94
Liabilities from price risk mangement activities - noncurrent	78	73
Other noncurrent liabilities	18	14
Total liabilities	4,034	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 June 30, 2013 and December 31, 2012	0	0
Common stock, no par value, 160,000,000 shares authorized; 77,362,458 and 75,556,272 shares issued and outstanding as of June 30, 2013 and December 31, 2012, respectively	889	841
Accumulated other comprehensive loss	(6)	(6)
Retained earnings	878	893
Total Portland General Electric Company shareholders' equity	1,761	1,728
Noncontrolling interests' equity	1	2
Total equity	1,762	1,730
Total liabilities and equity	$ 5,796	$ 5,670