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Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2015
Employee Benefits [Abstract]  
Assets and Liabilities associated with Non Qualified Benefit Plans [Table Text Block]
Trust assets and plan liabilities related to the NQBP included in PGE’s consolidated balance sheets are as follows as of December 31 (in millions): 
 
2015
 
2014
  
NQBP
 
Other NQBP
 
Total
 
NQBP
 
Other NQBP
 
Total
Non-qualified benefit plan trust
$
15

 
$
18

 
$
33

 
$
15

 
$
17

 
$
32

Non-qualified benefit plan liabilities *
25

 
81

 
106

 
25

 
80

 
105

 
 
 
 
 
*
For the NQBP, excludes the current portion of $2 million in 2015 and 2014, which is classified in Other current liabilities in the consolidated balance sheets.
Schedule of Allocation of Plan Assets [Table Text Block]
The asset allocations for the plans, and the target allocation, are as follows:
 
 
As of December 31,
  
2015
 
2014
 
Actual
 
Target *
 
Actual
 
Target *
Defined Benefit Pension Plan:
 
 
 
 
 
 
 
Equity securities
67
%
 
67
%
 
66
%
 
67
%
Debt securities
33

 
33

 
34

 
33

Total
100
%
 
100
%
 
100
%
 
100
%
Other Postretirement Benefit Plans:
 
 
 
 
 
 
 
Equity securities
60
%
 
64
%
 
66
%
 
67
%
Debt securities
40

 
36

 
34

 
33

Total
100
%
 
100
%
 
100
%
 
100
%
Non-Qualified Benefits Plans:
 
 
 
 
 
 
 
Equity securities
15
%
 
14
%
 
19
%
 
13
%
Debt securities
7

 
8

 
1

 
7

Insurance contracts
78

 
78

 
80

 
80

Total
100
%
 
100
%
 
100
%
 
100
%
 
 
 
 
 
*
The target for the Defined Benefit Pension Plan represents the mid-point of the investment target range. Due to the nature of the investment vehicles in both the Other Postretirement Benefit Plans and the Non-Qualified Benefit Plans, these targets are the weighted average of the mid-point of the respective investment target ranges approved by the Investment Committee. Due to the method used to calculate the weighted average targets for the Other Postretirement Benefit Plans and Non-Qualified Benefit Plans, reported percentages are affected by the fair market values of the investments within the pools.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The Company’s financial assets and liabilities whose values were recognized at fair value are as follows by level within the fair value hierarchy (in millions): 
 
As of December 31, 2015
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Nuclear decommissioning trust: (1)
 
 
 
 
 
 
 
Money market funds
$

 
$
18

 
$

 
$
18

Debt securities:
 
 
 
 
 
 
 
Domestic government
6

 
8

 

 
14

Corporate credit

 
8

 

 
8

Non-qualified benefit plan trust: (2)
 
 
 
 
 
 
 
Money market funds

 
1

 

 
1

Equity securities:
 
 
 
 
 
 
 
Domestic
3

 
2

 

 
5

International

 

 

 

Debt securities - domestic government
1

 

 

 
1

Assets from price risk management activities: (1) (3)
 
 
 
 
 
 
 
Electricity

 
7

 

 
7

Natural gas

 
3

 

 
3

 
$
10

 
$
47

 
$

 
$
57

Liabilities - Liabilities from price risk management
activities: (1) (3)
 
 
 
 
 
 
 
Electricity
$

 
$
28

 
$
105

 
$
133

Natural gas

 
144

 
14

 
158

 
$

 
$
172

 
$
119

 
$
291

 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2)
Excludes insurance policies of $26 million, which are recorded at cash surrender value.
(3)
For further information, see Note 5, Price Risk Management.

 
As of December 31, 2014
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Nuclear decommissioning trust: (1)
 
 
 
 
 
 
 
Money market funds
$

 
$
65

 
$

 
$
65

Debt securities:
 
 
 
 
 
 
 
Domestic government
7

 
7

 

 
14

Corporate credit

 
11

 

 
11

Non-qualified benefit plan trust: (2)
 
 
 
 
 
 
 
Equity securities:
 
 
 
 
 
 
 
Domestic
4

 
1

 

 
5

International
1

 

 

 
1

Assets from price risk management activities: (1) (3)
 
 
 
 
 
 
 
Electricity

 
4

 
1

 
5

Natural gas

 
2

 

 
2

 
$
12

 
$
90

 
$
1

 
$
103

Liabilities - Liabilities from price risk management
activities: (1) (3)
 
 
 
 
 
 
 
Electricity
$

 
$
32

 
$
80

 
$
112

Natural gas

 
95

 
21

 
116

 
$

 
$
127

 
$
101

 
$
228

 
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2)
Excludes insurance policies of $26 million, which are recorded at cash surrender value.
(3)
For further information, see Note 5, Price Risk Management.
The fair values of the Company’s pension plan assets and other postretirement benefit plan assets by asset category are as follows (in millions):
 
Level 1
 
Level 2
 
Level 3
 
Total
As of December 31, 2015:
 
 
 
 
 
 
 
Defined Benefit Pension Plan assets:
 
 
 
 
 
 
 
Money market funds
$

 
$
5

 
$

 
$
5

Equity securities:
 
 
 
 
 
 
 
Domestic
$
44

 
$
132

 
$

 
$
176

International

 
170

 

 
170

Debt securities:
 
 
 
 
 
 
 
Domestic government and corporate credit

 
177

 

 
177

Private equity funds

 

 
22

 
22

 
$
44

 
$
484

 
$
22

 
$
550

Other Postretirement Benefit Plans assets:
 
 
 
 
 
 
 
Money market funds
$

 
$
7

 
$

 
$
7

Equity securities:
 
 
 
 
 
 
 
Domestic

 
10

 

 
10

International
8

 

 

 
8

Debt securities—Domestic government

 
5

 

 
5

 
$
8

 
$
22

 
$

 
$
30

As of December 31, 2014:
 
 
 
 
 
 
 
Defined Benefit Pension Plan assets:
 
 
 
 
 
 
 
Money market funds
$

 
$
6

 
$

 
$
6

Equity securities:
 
 
 
 
 
 
 
Domestic
$
42

 
$
146

 
$

 
$
188

International

 
171

 

 
171

Debt securities:
 
 
 
 
 
 
 
Domestic government and corporate credit

 
197

 

 
197

Private equity funds

 

 
29

 
29

 
$
42

 
$
520

 
$
29

 
$
591

Other Postretirement Benefit Plans assets:
 
 
 
 
 
 
 
Money market funds
$

 
$
6

 
$

 
$
6

Equity securities:
 
 
 
 
 
 
 
Domestic
10

 
1

 

 
11

International
10

 

 

 
10

Debt securities—Domestic government
5

 

 

 
5

 
$
25

 
$
7

 
$

 
$
32

 
 
 
 
 
 
 
 

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Changes in the fair value of assets held by the pension plan classified as Level 3 in the fair value hierarchy, which consists of Private equity funds, were as follows (in millions):

 
Years Ended December 31,
 
2015
 
2014
Level 3 balance as of beginning of year
$
29

 
$
31

Unrealized (losses) gains, net
(2
)
 
2

Realized gains, net
4

 
3

Sales, net
(9
)
 
(7
)
Level 3 balance as of end of year
$
22

 
$
29


Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following tables provide certain information with respect to the Company’s defined benefit pension plan, other postretirement benefits, and non-qualified benefit plans as of and for the years ended December 31, 2015 and 2014. Information related to the Other NQBP is not included in the following tables (dollars in millions):

 
Defined Benefit Pension Plan
 
  Other Postretirement  
Benefits
 
 
Non-Qualified
Benefit Plans
  
2015
 
2014
 
2015
 
 
2014
 
 
2015
 
2014
Benefit obligation:
 
 
 
 
 
 
 
 
 
 
 
 
 
As of January 1
$
777

 
$
705

 
$
83

 
 
$
77

 
 
$
27

 
$
24

Service cost
18

 
15

 
2

 
 
2

 
 

 

Interest cost
31

 
34

 
3

 
 
4

 
 
1

 
1

Participants’ contributions

 

 
2

 
 
1

 
 

 

Actuarial (gain) loss
(31
)
 
72

 
(4
)
 
 
4

 
 
1

 
5

Contractual termination benefits

 

 
1

 
 
1

 
 

 

Benefit payments
(35
)
 
(48
)
 
(6
)
 
 
(6
)
 
 
(2
)
 
(3
)
Administrative expenses
(2
)
 
(1
)
 

 
 

 
 

 

As of December 31
$
758

 
$
777

 
$
81

 
 
$
83

 
 
$
27

 
$
27

Fair value of plan assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
As of January 1
$
591

 
$
596

 
$
32

 
 
$
32

 
 
$
15

 
$
16

Actual return on plan assets
(4
)
 
44

 
(2
)
 
 
1

 
 

 
1

Company contributions

 

 
4

 
 
4

 
 
2

 
1

Participants’ contributions

 

 
2

 
 
1

 
 

 

Benefit payments
(35
)
 
(48
)
 
(6
)
 
 
(6
)
 
 
(2
)
 
(3
)
Administrative expenses
(2
)
 
(1
)
 

 
 

 
 

 

As of December 31
$
550

 
$
591

 
$
30

 
 
$
32

 
 
$
15

 
$
15

Unfunded position as of December 31
$
(208
)
 
$
(186
)
 
$
(51
)
 
 
$
(51
)
 
 
$
(12
)
 
$
(12
)
Accumulated benefit plan obligation as of December 31
$
681

 
$
691

 
N/A
 
 
N/A
 
 
$
27

 
$
27

Classification in consolidated balance sheet:
 
 
 
 
 
 
 
 
 
 
 
 
 
Noncurrent asset
$

 
$

 
$

 
 
$

 
 
$
15

 
$
15

Current liability

 

 

 
 

 
 
(2
)
 
(2
)
Noncurrent liability
(208
)
 
(186
)
 
(51
)
 
 
(51
)
 
 
(25
)
 
(25
)
Net liability
$
(208
)
 
$
(186
)
 
$
(51
)
 
 
$
(51
)
 
 
$
(12
)
 
$
(12
)
Amounts included in comprehensive income:
 
 
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss
$
13

 
$
67

 
$

 
 
$
5

 
 
$
1

 
$
5

Amortization of net actuarial loss
(20
)
 
(17
)
 
(1
)
 
 
(1
)
 
 
(1
)
 
(1
)
Amortization of prior service cost

 

 
(1
)
 
 
(1
)
 
 

 

 
$
(7
)
 
$
50

 
$
(2
)
 
 
$
3

 
 
$

 
$
4

Amounts included in AOCL*:
 
 
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss
$
228

 
$
236

 
$
9

 
 
$
10

 
 
$
13

 
$
13

Prior service cost

 

 
1

 
 
1

 
 

 

 
$
228

 
$
236

 
$
10

 
 
$
11

 
 
$
13

 
$
13

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Defined Benefit Pension Plan
 
  Other Postretirement  
Benefits
 
 
Non-Qualified
Benefit Plans
  
2015
 
2014
 
2015
 
 
2014
 
 
2015
 
2014
Assumptions used:
 
 
 
 
 
 
 
 
 
 
 
 
 
Discount rate for benefit obligation
4.36
%
 
4.02
%
 
3.90
%
-
 
3.07
%
-
 
4.36
%
 
4.02
%
 
 
 
 
 
4.45
%
 
 
4.10
%
 
 
 
 
 
Discount rate for benefit cost
4.02
%
 
4.84
%
 
3.07
%
-
 
3.46
%
-
 
4.02
%
 
4.84
%
 
 
 
 
 
4.10
%
 
 
4.96
%
 
 
 
 
 
Weighted average rate of compensation increase for benefit obligation
3.65
%
 
3.65
%
 
4.58
%
 
 
4.58
%
 
 
N/A

 
N/A

Weighted average rate of compensation increase for benefit cost
3.65
%
 
3.65
%
 
4.58
%
 
 
4.58
%
 
 
N/A

 
N/A

Long-term rate of return on plan assets for benefit obligation
7.50
%
 
7.50
%
 
6.29
%
 
 
6.37
%
 
 
N/A

 
N/A

Long-term rate of return on plan assets for benefit cost
7.50
%
 
7.50
%
 
6.37
%
 
 
6.46
%
 
 
N/A

 
N/A

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
*
Amounts included in AOCL related to the Company’s defined benefit pension plan and other postretirement benefits are transferred to Regulatory assets due to the future recoverability from retail customers. Accordingly, as of the balance sheet date, such amounts are included in Regulatory assets.
Schedule of Net Benefit Costs [Table Text Block]
Net periodic benefit cost consists of the following for the years ended December 31 (in millions):

 
Defined Benefit
Pension Plan
 
Other Postretirement
Benefits
 
Non-Qualified
Benefit Plans
  
2015
 
2014
 
2013
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Service cost
$
18

 
$
15

 
$
17

 
$
2

 
$
2

 
$
2

 
$

 
$

 
$

Interest cost on benefit obligation
31

 
34

 
30

 
3

 
4

 
3

 
1

 
1

 
1

Expected return on plan assets
(40
)
 
(39
)
 
(40
)
 
(2
)
 
(2
)
 
(1
)
 

 

 

Amortization of prior service cost

 

 

 
1

 
1

 
1

 

 

 

Amortization of net actuarial loss
20

 
17

 
24

 
1

 
1

 
1

 
1

 
1

 
1

Net periodic benefit cost
$
29

 
$
27

 
$
31

 
$
5

 
$
6

 
$
6

 
$
2

 
$
2

 
$
2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Expected Benefit Payments [Table Text Block]
The following table summarizes the benefits expected to be paid to participants in each of the next five years and in the aggregate for the five years thereafter (in millions):
 
Payments Due
  
2016
 
2017
 
2018
 
2019
 
2020
 
2021 - 2025
Defined benefit pension plan
$
37

 
$
38

 
$
40

 
$
41

 
$
42

 
$
226

Other postretirement benefits
5

 
5

 
5

 
5

 
5

 
26

Non-qualified benefit plans
2

 
2

 
2

 
3

 
2

 
10

Total
$
44

 
$
45

 
$
47

 
$
49

 
$
49

 
$
262