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Balance Sheet Components Investments Held in Trust (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Marketable securities, at fair value: |  |
Decommissioning Fund Investments, Fair Value | $ 90 us-gaap_DecommissioningTrustAssetsAmount | $ 82 us-gaap_DecommissioningTrustAssetsAmount
Non-qualified benefit plan trust | 32 us-gaap_AssetsHeldInTrustNoncurrent | 35 us-gaap_AssetsHeldInTrustNoncurrent
Nuclear Decommissioning [Member] |  |
Cash equivalents | 65 us-gaap_CashEquivalentsAtCarryingValue / por_TrustAxis = por_NuclearDecommissioningMember | 59 us-gaap_CashEquivalentsAtCarryingValue / por_TrustAxis = por_NuclearDecommissioningMember
Marketable securities, at fair value: |  |
Equity securities | 0 us-gaap_MarketableSecuritiesEquitySecurities / por_TrustAxis = por_NuclearDecommissioningMember | 0 us-gaap_MarketableSecuritiesEquitySecurities / por_TrustAxis = por_NuclearDecommissioningMember
Debt securities | 25 us-gaap_AvailableForSaleSecuritiesDebtSecurities / por_TrustAxis = por_NuclearDecommissioningMember | 23 us-gaap_AvailableForSaleSecuritiesDebtSecurities / por_TrustAxis = por_NuclearDecommissioningMember
Insurance contracts, at cash surrender value | 0 us-gaap_CashSurrenderValueFairValueDisclosure / por_TrustAxis = por_NuclearDecommissioningMember | 0 us-gaap_CashSurrenderValueFairValueDisclosure / por_TrustAxis = por_NuclearDecommissioningMember
Decommissioning Fund Investments, Fair Value | 90 us-gaap_DecommissioningTrustAssetsAmount / por_TrustAxis = por_NuclearDecommissioningMember | 82 us-gaap_DecommissioningTrustAssetsAmount / por_TrustAxis = por_NuclearDecommissioningMember
Non Qualified Benefit Plans [Member] |  |
Cash equivalents | 0 us-gaap_CashEquivalentsAtCarryingValue / por_TrustAxis = por_NonQualifiedBenefitPlansMember | 0 us-gaap_CashEquivalentsAtCarryingValue / por_TrustAxis = por_NonQualifiedBenefitPlansMember
Marketable securities, at fair value: |  |
Equity securities | 6 us-gaap_MarketableSecuritiesEquitySecurities / por_TrustAxis = por_NonQualifiedBenefitPlansMember | 8 us-gaap_MarketableSecuritiesEquitySecurities / por_TrustAxis = por_NonQualifiedBenefitPlansMember
Debt securities | 0 us-gaap_AvailableForSaleSecuritiesDebtSecurities / por_TrustAxis = por_NonQualifiedBenefitPlansMember | 1 us-gaap_AvailableForSaleSecuritiesDebtSecurities / por_TrustAxis = por_NonQualifiedBenefitPlansMember
Insurance contracts, at cash surrender value | 26 us-gaap_CashSurrenderValueFairValueDisclosure / por_TrustAxis = por_NonQualifiedBenefitPlansMember | 26 us-gaap_CashSurrenderValueFairValueDisclosure / por_TrustAxis = por_NonQualifiedBenefitPlansMember
Non-qualified benefit plan trust | $ 32 us-gaap_AssetsHeldInTrustNoncurrent / por_TrustAxis = por_NonQualifiedBenefitPlansMember | $ 35 us-gaap_AssetsHeldInTrustNoncurrent / por_TrustAxis = por_NonQualifiedBenefitPlansMember

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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph b -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Details
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