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Commitments and Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2020
Long-term Purchase Commitment [Line Items] |
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] | As of December 31, 2020, PGE’s estimated future minimum payments pursuant to purchase obligations for the following five years and thereafter are as follows (in millions):
| Payments Due
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter |  | Total
Capital and other purchase commitments | $ | 237 |  |  | $ | 33 |  |  | $ | 20 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 55 |  |  | $ | 347 |
Purchased power and fuel: |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity purchases | 250 |  |  | 257 |  |  | 284 |  |  | 278 |  |  | 249 |  |  | 2,886 |  |  | 4,204 |
Capacity contracts | 9 |  |  | 9 |  |  | 9 |  |  | 9 |  |  | 9 |  |  | — |  |  | 45 |
Public utility districts | 21 |  |  | 19 |  |  | 18 |  |  | 17 |  |  | 17 |  |  | 39 |  |  | 131 |
Natural gas | 57 |  |  | 42 |  |  | 37 |  |  | 43 |  |  | 43 |  |  | 578 |  |  | 800 |
Coal and transportation | 27 |  |  | 27 |  |  | 27 |  |  | 27 |  |  | 27 |  |  | — |  |  | 135 |
Total | $ | 601 |  |  | $ | 387 |  |  | $ | 395 |  |  | $ | 375 |  |  | $ | 346 |  |  | $ | 3,558 |  |  | $ | 5,662 |
Schedule of Long-term Contracts for Purchase of Electric Power [Table Text Block] | PGE has long-term power purchase agreements with certain public utility districts (PUDs) in the state of Washington: •Grant County PUD for the Priest Rapids and Wanapum Hydroelectric Projects, and •Douglas County PUD for the Wells Hydroelectric Project. Under the Grant County agreements, the Company is required to pay its proportionate share of the operating and debt service costs of the hydroelectric projects whether they are operable or not. Under the Douglas County agreement, the Company is required to make monthly payments for capacity that will not vary with annual project generation provided to PGE. The Company has estimated the capacity payments, which are subject to annual adjustments based on Douglas County’s loads, and included the estimated amounts in the table above. The future minimum payments for the PUDs in the preceding table reflect the principal and capacity payments only and do not include interest, operation, or maintenance expenses. Selected information regarding these projects is summarized as follows (dollars in millions):
| Capacity Charges and Revenue Bonds as of December 31, 2020 |  | PGE’s Average Share as of December 31, 2020 |  | Contract Expiration |  | Total PGE Contract Costs
| Output |  | Capacity |  |  | 2020 |  | 2019 |  | 2018
|  |  |  |  | (in MW) |  |  |  |  |  |  |  |
Priest Rapids and Wanapum | $ | 1,880 |  |  | 8.6 | % |  | 163 |  |  | 2052 |  | $ | 25 |  |  | $ | 21 |  |  | $ | 17 |
Wells | 572 |  |  | 16.6 |  |  | 94 |  |  | 2028 |  | 23 |  |  | 16 |  |  | 11 |

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- Definition Tabular disclosure of information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements (PSAs)) including date of contract expiration, share of plant output being purchased, estimated annual cost, annual minimum debt service payment required and amount of related long-term debt or lease obligations outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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