Commitments and Guarantees (Tables)

12 Months Ended

Dec. 31, 2017

Long-term Purchase Commitment [Line Items]

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

As of December 31, 2017, PGE’s estimated future minimum payments pursuant to purchase obligations for the following five years and thereafter are as follows (in millions):

	Payments Due
	2018		2019		2020		2021		2022		Thereafter		Total
Capital and other purchase commitments	$	191	$	2	$	10	$	2	$	2	$	58	$	265
Purchased power and fuel:
Electricity purchases	156		156		201		200		187		1,733		2,633
Capacity contracts	6		5		4		4		4		8		31
Public utility districts	9		17		16		16		15		85		158
Natural gas	51		35		28		25		24		140		303
Coal and transportation	15		5		—		—		—		—		20
Total	$	428	$	220	$	259	$	247	$	232	$	2,024	$	3,410

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 including, Grant County PUD for the Priest Rapids and Wanapum projects, and Douglas County PUD for the Wells project, in the state of Washington. Under the agreements, the Company is required to pay its proportionate share of the operating and debt service costs of the hydroelectric projects whether or not they are operable. In addition, although PGE’s current agreement with Douglas County ends on August 31, 2018, a new contract becomes effective on September 1, 2018 that does not require contributions to Douglas County debt obligation or other costs, including the operation and maintenance costs of the projects. The new contract requires 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 loads, and included the estimated amounts in the table above. The future minimum payments for the public utility districts 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):

	Revenue Bonds as of December 31, 2017		PGE’s Share as of December 31, 2017			Contract Expiration	PGE Cost, including Debt Service
			Output		Capacity		2017		2016		2015
					(in MW)
Priest Rapids and Wanapum	$	1,269	8.6	%	163	2052	$	16	$	16	$	18
Wells	160		19.4		150	2018	11		10		10
Portland Hydro	—		—		—	2017	1		1		2

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

As of December 31, 2017, PGE’s estimated future minimum lease payments pursuant to capital, build-to-suit, and operating leases for the following five years and thereafter are as follows (in millions):

	Future Minimum Lease Payments
	Capital Leases		Build-to-Suit		Operating Leases
2018	$	7	$	—	$	9
2019	6		15		8
2020	6		15		6
2021	6		14		6
2022	5		14		8
Thereafter	72		260		165
Total minimum lease payments	$	102	$	318	$	202
Less imputed interest	51
Present value of net minimum lease payments	$	51
Less current portion	2
Non-current portion	$	49