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Long-term Debt Schedule of Long Term Debt Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
First Mortgage Bonds, rates range from 3.46% to 9.31%, with a weighted average rate of 5.84% in 2012 and 5.83% in 2011, due at various dates through 2040 $ 1,515 $ 1,615
Pollution Control Revenue Bonds, 5% rate, due 2033 142 142
Pollution Control Revenue Bonds owned by PGE (21) (21)
Unamortized debt discount 0 (1)
Total long-term debt 1,636 1,735
Less: current portion of long-term debt (100) (100)
Long-term debt, net of current portion $ 1,536 $ 1,635