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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