XML 106 R95.htm IDEA: XBRL DOCUMENT v2.4.0.6
Commitments and Guarantees Schdule of Long term contracts for purchase of electric power (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
MW
Dec. 31, 2011
Dec. 31, 2010
Priest Rapids and Wanapum [Member]
      
Long-term Contract for Purchase of Electric Power [Line Items]      
Revenue Bonds issued by the Public Utility Districts $ 928    
PGE Share of Output 9.00%    
PGE Share of Capacity 181    
Long-term Contract for Purchase of Electric Power, Date of Contract Expiration Dec. 31, 2052    
commitment costs 14 14 10
Wells [Member]
      
Long-term Contract for Purchase of Electric Power [Line Items]      
Revenue Bonds issued by the Public Utility Districts 238    
PGE Share of Output 19.40%    
PGE Share of Capacity 159    
Long-term Contract for Purchase of Electric Power, Date of Contract Expiration Dec. 31, 2018    
commitment costs 10 10 7
Portland Hydro [Member]
      
Long-term Contract for Purchase of Electric Power [Line Items]      
Revenue Bonds issued by the Public Utility Districts 9    
PGE Share of Output 100.00%    
PGE Share of Capacity 36    
Long-term Contract for Purchase of Electric Power, Date of Contract Expiration Dec. 31, 2017    
commitment costs $ 4 $ 4 $ 4