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Long-term Debt Schedule of Long Term Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
First Mortgage Bonds, rates range from 3.46% to 9.31%, with a weighted average rate of 5.42% in 2014 and 5.62% in 2013, due at various dates through 2048 $ 2,083 $ 2,075
Unsecured Debt, Current 0 305
Pollution Control Revenue Bonds, 5% rate, due 2033 142 142
Pollution Control Revenue Bonds owned by PGE (21) (21)
Total long-term debt 2,204 2,501
Less: current portion of long-term debt (133) (375)
Long-term debt, net of current portion $ 2,071 $ 2,126