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Leases Leases (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | $ 14 |
Operating Lease, Liability | 44 | $ 51
Operating Lease, Liability, Related to Power Purchase Agreements | 25 | $ 32
Lessee, Operating Lease, Lease Not yet Commenced, Estimated Present Value of Future Lease Payments | $ 30 |

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Estimated Present Value of Future Lease Payments + References No definition available. + Details
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- Definition Operating Lease, Liability, Related to Power Purchase Agreements + References No definition available. + Details
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Namespace Prefix: | por_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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Period Type: | instant

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- References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Balance Type: | credit
Period Type: | instant