Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Components of Earnings per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Components of basic and diluted earnings per share were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Numerator (in millions):
Net income attributable to Portland General Electric Company common shareholders	$	27	$	49	$	118	$	100
Denominator (in thousands):
Weighted-average common shares outstanding - basic	75,342		75,295		75,329		75,267
Dilutive effect of unvested restricted stock units and employee stock purchase plan shares	16		16		16		15
Weighted-average common shares outstanding - diluted	75,358		75,311		75,345		75,282
Earnings per share:
Basic	$	0.36	$	0.65	$	1.57	$	1.32
Diluted	$	0.36	$	0.65	$	1.57	$	1.32