XML 58 R83.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Employee Benefits Schedule of Fair Value, Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Domestic | $ 163 | $ 163
Debt securities—Domestic government | 3 | 2
Equity securities: |  |
Domestic | 13 | 5
Domestic | 9 |
International | 1 |
International | 4 | 2
Debt securities: |  |
Domestic government and corporate credit | 78 | 138
Domestic government and corporate credit | 3 |
Corporate credit | 76 | 28
Private equity funds | 32 | 23
Alternative investments | 30 |
Defined Benefit Plan, Fair Value of Plan Assets | 487 | 473
Other Postretirement Benefit Plans assets: |  |
Money market funds | 7 | 7
Equity securities: |  |
Domestic | 13 | 5
Domestic | 9 |
International | 1 |
International | 4 | 2
Debt securities—Domestic government | 12 |
Other post retirement benefit plan assets total | 27 | 16
Money market funds | 3 | 15
International | 105 | 106
Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Domestic | 151 | 52
Debt securities—Domestic government | 3 | 2
Equity securities: |  |
Domestic | 12 | 3
Domestic | 7 | 16
International | 1 | 2
International | 2 | 1
Debt securities: |  |
Domestic government and corporate credit | 0 | 68
Domestic government and corporate credit | 3 | 2
Corporate credit | 76 | 0
Private equity funds | 0 | 0
Alternative investments | 0 |
Defined Benefit Plan, Fair Value of Plan Assets | 281 | 173
Other Postretirement Benefit Plans assets: |  |
Money market funds | 0 | 0
Equity securities: |  |
Domestic | 12 | 3
Domestic | 7 | 16
International | 1 | 2
International | 2 | 1
Debt securities—Domestic government | 3 | 3
Other post retirement benefit plan assets total | 17 | 6
Money market funds | 0 | 0
International | 54 | 53
Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Domestic | 12 | 111
Debt securities—Domestic government | 0 | 0
Equity securities: |  |
Domestic | 1 | 2
Domestic | 2 | 0
International | 0 | 1
International | 2 | 1
Debt securities: |  |
Domestic government and corporate credit | 78 | 70
Domestic government and corporate credit | 0 | 0
Corporate credit | 0 | 0
Private equity funds | 0 | 0
Alternative investments | 0 |
Defined Benefit Plan, Fair Value of Plan Assets | 144 | 249
Other Postretirement Benefit Plans assets: |  |
Money market funds | 7 | 7
Equity securities: |  |
Domestic | 1 | 2
Domestic | 2 | 0
International | 0 | 1
International | 2 | 1
Debt securities—Domestic government | 9 | 9
Other post retirement benefit plan assets total | 10 | 10
Money market funds | 3 | 15
International | 51 | 53
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Domestic | 0 | 0
Debt securities—Domestic government | 0 | 0
Equity securities: |  |
Domestic | 0 | 0
Domestic | 0 | 0
International | 0 | 0
International | 0 | 0
Debt securities: |  |
Domestic government and corporate credit | 0 | 0
Domestic government and corporate credit | 0 | 0
Corporate credit | 0 | 28
Private equity funds | 32 | 23
Alternative investments | 30 |
Defined Benefit Plan, Fair Value of Plan Assets | 62 | 51
Other Postretirement Benefit Plans assets: |  |
Money market funds | 0 | 0
Equity securities: |  |
Domestic | 0 | 0
Domestic | 0 | 0
International | 0 | 0
International | 0 | 0
Debt securities—Domestic government | 0 | 0
Other post retirement benefit plan assets total | 0 | 0
Money market funds | 0 | 0
International | $ 0 | $ 0

X
- Details
Name: | por_DebtSecuritiesAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition debt securities - domestic government + References No definition available. + Details
Name: | por_DebtSecuritiesDomesticGovernment
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt securities—Domestic government Other Postretirement Benefit Plan assets + References No definition available. + Details
Name: | por_DebtSecuritiesdomesticGovernmentOtherPostretirementBenefitPlanAssets
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Domestic Equity Securities + References No definition available. + Details
Name: | por_DomesticEquitySecurities
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Domestic equity securities - defined benefit pension plan assets + References No definition available. + Details
Name: | por_DomesticEquitySecuritiesDefinedBenefitPensionPlanAssets
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Domestic equity securities - Other postretirement benefit plan assets at fair value + References No definition available. + Details
Name: | por_DomesticEquitySecuritiesOtherPostretirementBenefitPlanAssetsAtFairValue
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Domestic government and corporate credit defined benefit pension plan assets + References No definition available. + Details
Name: | por_DomesticGovernmentAndCorporateCreditDefinedBenefitPensionPlanAssets
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | por_EquitySecuritiesAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition International equity securities + References No definition available. + Details
Name: | por_InternationalEquitySecurities
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition International equity securities - defined benefit pension plan assets + References No definition available. + Details
Name: | por_InternationalEquitySecuritiesDefinedBenefitPensionPlanAssets
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition International equity securities - other post retirement assets at fair value + References No definition available. + Details
Name: | por_InternationalEquitySecuritiesOtherPostRetirementAssetsAtFairValue
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Money market funds - defined benefit pension plan assets + References No definition available. + Details
Name: | por_MoneyMarketFundsDefinedBenefitPensionPlanAssets
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Money market funds - other post retirement benefit plan assets at fair value + References No definition available. + Details
Name: | por_MoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition other post retirement benefit plan assets total + References No definition available. + Details
Name: | por_OtherPostRetirementBenefitPlanAssetsTotal
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | por_OtherPostretirementBenefitPlansAssetsAbstract
Namespace Prefix: | por_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Private equity fund securities held in Defined Benefit Pension Plan assets + References No definition available. + Details
Name: | por_PrivateEquityFunds
Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Subparagraph (a) -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=6925170&loc=SL6742756-110258 + Details
Name: | us-gaap_AlternativeInvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt (bills, notes or bonds) that are issued by the government of the United States which are 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. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
Name: | us-gaap_USGovernmentSecuritiesAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant