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Commitments and Guarantees (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 1985
Unrecorded Unconditional Purchase Obligation [Line Items]            
percentage of output     25.00%      
Operating Leases, Rent Expense     $ 10 $ 9 $ 9  
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years     3      
Operating Leases, Future Minimum Payments Receivable, Current     3      
Operating Leases, Future Minimum Payments, Due in Four Years     2      
Operating Leases, Future Minimum Payments, Due in Five Years     1      
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost 2 7        
Operating Leases, Rent Expense, Sublease Rentals     3 3 3  
Ownership interest in Boardman sold           15.00%
ownership interest in Pacific Northwest Intertie sold           10.714%
maximum potential liability under power and transmission agreements     47      
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Four Years     $ 3