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Commitments and Guarantees Lease Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | $ 14 |  | $ 14 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals | 4 |  | 4 |  |
Operating Leases, Rent Expense, Sublease Rentals |  |  | 4 | $ 3 | $ 3
Capital Leases, Future Minimum Payments Due, Next Twelve Months | 7 |  | 7 |  |
Contractual Obligation, Due in Next Fiscal Year | 0 |  | 0 |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 10 |  | $ 10 |  |
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] |  |  | As of December 31, 2016, 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
2017 | $ | 7 |  |  | $ | — |  |  | $ | 10 |
2018 | 7 |  |  | 4 |  |  | 9 |
2019 | 6 |  |  | 14 |  |  | 6 |
2020 | 6 |  |  | 13 |  |  | 6 |
2021 | 6 |  |  | 13 |  |  | 7 |
Thereafter | 77 |  |  | 237 |  |  | 177 |
Total minimum lease payments | $ | 109 |  |  | $ | 281 |  |  | $ | 215 |
Less imputed interest | 55 |  |  |  |  |
Present value of net minimum lease payments | $ | 54 |  |  |  |  |
Less current portion | 3 |  |  |  |  |
Non-current portion | $ | 51 |  |  |  |  |
Capital Leased Assets, Gross | 57 |  | $ 57 |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 3 |  | 3 |  |
Capital Leases, Future Minimum Payments Due in Two Years | 7 |  | 7 |  |
Contractual Obligation, Due in Second Year | 4 |  | 4 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 9 |  | 9 |  |
Capital Leases, Future Minimum Payments Due in Three Years | 6 |  | 6 |  |
Contractual Obligation, Due in Third Year | 14 |  | 14 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 6 |  | 6 |  |
Capital Leases, Future Minimum Payments Due in Four Years | 6 |  | 6 |  |
Contractual Obligation, Due in Fourth Year | 13 |  | 13 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 6 |  | 6 |  |
Capital Leases, Future Minimum Payments Due in Five Years | 6 |  | 6 |  |
Contractual Obligation, Due in Fifth Year | 13 |  | 13 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 7 |  | 7 |  |
Capital Leases, Future Minimum Payments Due Thereafter | 77 |  | 77 |  |
Contractual Obligation, Due after Fifth Year | 237 |  | 237 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 177 |  | 177 |  |
Capital Leases, Future Minimum Payments Due | 109 |  | 109 |  |
Contractual Obligation | 281 |  | 281 |  |
Operating Leases, Future Minimum Payments Due | 215 |  | 215 |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments | 55 |  | 55 |  |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments | 54 |  | 54 |  |
Capital Lease Obligations, Current | 3 |  | 3 |  |
Purchase Commitment, Remaining Minimum Amount Committed | 51 |  | 51 |  |
Deferred Costs, Leasing, Accumulated Amortization | 1 | $ 2 | 1 |  |
Interest Expense, Lessee, Assets under Capital Lease | 2 | $ 3 |  |  |
Long-term Purchase Commitment, Amount |  |  | 128 |  |
Capital Addition Purchase Commitments [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | $ 21 |  | $ 21 |  |

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- Definition Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount necessary to reduce net minimum lease payments to present value for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 + Details
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- Definition The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6916424&loc=d3e43161-112731 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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