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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies [Abstract] |
Estimated average service lives [Table Text Block] | Depreciation is provided on PGE’s other classes of plant in service over their estimated average service lives, which are as follows (in years):
Generation, excluding thermal: |
Hydro | 98
Wind | 30
Transmission | 59
Distribution | 46
General | 12
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following table illustrates the adjustments made upon adoption of Topic 842 and the corresponding line items affected on the Company’s consolidated balance sheets (in millions):
| January 1, 2019 Topic 842 Adoption Adjustments
| Increase due to existing operating and finance leases |  | Decrease due to build-to-suit reassessment |  | Decrease due to capital lease reassessment |  | Total Increase/(Decrease)
Assets |  |  |  |  |  |  |
Electric utility plant, net | $ | 2 |  |  | $ | (131 | ) |  | $ | (49 | ) |  | $ | (178 | )
Other noncurrent assets | 42 |  |  | — |  |  | — |  |  | 42 |
Liabilities |  |  |  |  |  |  |
Accrued expenses and other current liabilities | 5 |  |  | — |  |  | (2 | ) |  | 3 |
Other noncurrent liabilities | 39 |  |  | (131 | ) |  | (47 | ) |  | (139 | )

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