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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 |  |  |

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- Definition Estimated annual cost to purchase electricity under a long-term contract from a production plant constructed and financed by a public utility district, cooperative, or other organization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.D) -URI http://asc.fasb.org/extlink&oid=6499423&loc=d3e659339-123030 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section D + Details
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