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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
Net pension cost includes the following components:
 
2013
 
2012
 
2011
 
(In millions)
Service cost
$
73

 
$
64

 
$
55

Interest cost
146

 
155

 
154

Expected return on plan assets
(184
)
 
(166
)
 
(168
)
Amortization of:
 
 
 
 
 
Net loss
148

 
124

 
99

Prior service cost
1

 
1

 
4

Settlements
—

 
2

 
2

Net pension cost
$
184

 
$
180

 
$
146
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
 
2013
 
2012
 
(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income
 
 
 
Net actuarial (gain) loss
$
(418
)
 
$
289

Amortization of net actuarial loss
(148
)
 
(125
)
Amortization of prior service cost
(1
)
 
(1
)
Total recognized in Regulatory assets and Other comprehensive income
$
(567
)
 
$
163

Total recognized in net periodic pension cost, Regulatory assets and Other comprehensive income
$
(383
)
 
$
343

Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income into net periodic benefit cost during next fiscal year
 

 
 

Net actuarial loss
$
106

 
$
143

Prior service cost
$
1

 
$
1
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table reconciles the obligations, assets and funded status of the plan as well as the amount recognized as prepaid pension cost or pension liability in the Consolidated Statements of Financial Position at December 31:

 
2013
 
2012
 
(In millions)
Accumulated benefit obligation, end of year
$
3,111

 
$
3,307

Change in projected benefit obligation
 
 
 
Projected benefit obligation, beginning of year
$
3,585

 
$
3,196

Service cost
73

 
64

Interest cost
146

 
155

Actuarial (gain) loss
(286
)
 
342

Settlements
—

 
2

Benefits paid
(177
)
 
(174
)
Projected benefit obligation, end of year
$
3,341

 
$
3,585

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
2,211

 
$
1,957

Actual return on plan assets
316

 
220

Company contributions
282

 
208

Benefits paid
(177
)
 
(174
)
Plan assets at fair value, end of year
$
2,632

 
$
2,211

Funded status of the plan
$
(709
)
 
$
(1,374
)
Amount recorded as:
 
 
 
Current liabilities
$
(4
)
 
$
(6
)
Noncurrent liabilities
(705
)
 
(1,368
)
 
$
(709
)
 
$
(1,374
)
Amounts recognized in Regulatory assets (see Note 8)
 
 
 
Net actuarial loss
$
1,248

 
$
1,805

Prior service cost
9

 
10

 
$
1,257

 
$
1,815
Schedule of Expected Benefit Payments [Table Text Block]
At December 31, 2013, the benefits related to the Company’s qualified and nonqualified pension plans expected to be paid in each of the next five years and in the aggregate for the five fiscal years thereafter are as follows:
 
(In millions)
2014
$
187

2015
193

2016
200

2017
208

2018
216

2019 - 2023
1,182

Total
$
2,186
Schedule of Assumptions Used [Table Text Block]
Assumptions used in determining the projected benefit obligation and net pension costs are listed below:
 
2013
 
2012
 
2011
Projected benefit obligation
 
 
 
 
 
Discount rate
4.95
%
 
4.15
%
 
5.00
%
Rate of compensation increase
4.20
%
 
4.20
%
 
4.20
%
Net pension costs
 
 
 
 
 

Discount rate
4.15
%
 
5.00
%
 
5.50
%
Rate of compensation increase
4.20
%
 
4.20
%
 
4.00
%
Expected long-term rate of return on plan assets
8.25
%
 
8.25
%
 
8.50
%
Schedule of Allocation of Plan Assets [Table Text Block]
Target allocations for pension plan assets as of December 31, 2013 are listed below:
U.S. Large Cap Equity Securities
22
%
U.S. Small Cap and Mid Cap Equity Securities
5

Non U.S. Equity Securities
20

Fixed Income Securities
25

Hedge Funds and Similar Investments
20

Private Equity and Other
8

 
100
%
Pension Plans Fair Value Hierachy Level [Table Text Block]
Fair Value Measurements for pension plan assets at December 31, 2013 and 2012 (a):
 
December 31, 2013
 
December 31, 2012
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(In millions)
Asset Category:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term investments (b)
$
15

 
$
—

 
$
—

 
$
15

 
$
—

 
$
16

 
$
—

 
$
16

Equity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Large Cap (c)
639

 
—

 
—

 
639

 
478

 
31

 
—

 
509

U.S. Small/Mid Cap (d)
160

 
—

 
—

 
160

 
108

 
3

 
—

 
111

Non U.S. (e)
440

 
94

 
—

 
534

 
372

 
85

 
—

 
457

Fixed income securities (f)
11

 
623

 
—

 
634

 
61

 
491

 
—

 
552

Hedge Funds and Similar Investments (g)
193

 
50

 
285

 
528

 
147

 
56

 
238

 
441

Private Equity and Other (h)
—

 
—

 
122

 
122

 
—

 
—

 
125

 
125

Total
$
1,458

 
$
767

 
$
407

 
$
2,632

 
$
1,166

 
$
682

 
$
363

 
$
2,211


_______________________________________
(a)
See Note 3 — Fair Value for a description of levels within the fair value hierarchy.
(b)
This category predominantly represents certain short-term fixed income securities and money market investments that are managed in separate accounts or commingled funds. Pricing for investments in this category are obtained from quoted prices in actively traded markets or valuations from brokers or pricing services.
(c)
This category comprises both actively and not actively managed portfolios that track the S&P 500 low cost equity index funds. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.
(d)
This category represents portfolios of small and medium capitalization domestic equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.
(e)
This category primarily consists of portfolios of non-U.S. developed and emerging market equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.
(f)
This category includes corporate bonds from diversified industries, U.S. Treasuries, and mortgage-backed securities. Pricing for investments in this category is obtained from quoted prices in actively traded markets and quotations from broker or pricing services. Non-exchange traded securities and exchange-traded securities held in commingled funds are classified as Level 2 assets.
(g)
This category utilizes a diversified group of strategies that attempt to capture financial market inefficiencies and includes publicly traded debt and equity, publicly traded mutual funds, commingled and limited partnership funds and non-exchange traded securities. Pricing for Level 1 and Level 2 assets in this category is obtained from quoted prices in actively traded markets and quoted prices from broker or pricing services. Non-exchange traded securities held in commingled funds are classified as Level 2 assets. Valuations for some Level 3 assets in this category may be based on limited observable inputs as there may be little, if any, publicly available pricing.
(h)
This category includes a diversified group of funds and strategies that primarily invests in private equity partnerships. This category also includes investments in timber and private mezzanine debt. Pricing for investments in this category is based on limited observable inputs as there is little, if any, publicly available pricing. Valuations for assets in this category may be based on discounted cash flow analyses, relevant publicly-traded comparables and comparable transactions.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3):
 
Year Ended December 31, 2013
 
Year Ended December 31, 2012
 
Hedge Funds
and Similar
 
Private Equity
 
 
 
Hedge Funds
and Similar
 
Private Equity
 
 
 
Investments
 
and Other
 
Total
 
Investments
 
and Other
 
Total
 
(In millions)
Beginning Balance at January 1
$
238

 
$
125

 
$
363

 
$
205

 
$
116

 
321

Total realized/unrealized gains (losses):
 
 
 
 


 
 
 
 
 
 
Realized gains (losses)
—

 
12

 
12

 
13

 
(4
)
 
9

Unrealized gains (losses)
29

 
(10
)
 
19

 
(3
)
 
8

 
5

Purchases, sales and settlements:
 
 
 
 


 
 
 
 
 
 
Purchases
18

 
15

 
33

 
176

 
23

 
199

Sales
—

 
(20
)
 
(20
)
 
(153
)
 
(18
)
 
(171
)
Ending Balance at December 31
$
285

 
$
122

 
$
407

 
$
238


$
125


$
363

The amount of total gains for the period attributable to the change in unrealized gains or losses related to assets still held at the end of the period
$
27

 
$
2

 
$
29

 
$
11

 
$
4

 
$
15
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
Net other postretirement cost includes the following components:
 
2013
 
2012
 
2011
 
(In millions)
Service cost
$
35

 
$
51

 
$
49

Interest cost
67

 
91

 
91

Expected return on plan assets
(74
)
 
(61
)
 
(62
)
Amortization of:
 
 
 
 
 
Net loss
47

 
58

 
40

Prior service costs (credit)
(100
)
 
(16
)
 
(15
)
Net transition asset
—

 
2

 
2

Net other postretirement cost (benefit)
$
(25
)
 
$
125

 
$
105
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
 
2013
 
2012
 
(In millions)
Other changes in plan assets and APBO recognized in Regulatory assets (liabilities) and Other comprehensive income
 
 
 
Net actuarial gain
$
(258
)
 
$
(14
)
Amortization of net actuarial loss
(47
)
 
(58
)
Prior service credit
(159
)
 
(207
)
Amortization of prior service credit
100

 
16

Amortization of transition asset
—

 
(2
)
Total recognized in Regulatory assets (liabilities) and Other comprehensive income
$
(364
)
 
$
(265
)
Total recognized in net periodic benefit cost, Regulatory assets (liabilities) and Other comprehensive income
$
(389
)
 
$
(140
)
Estimated amounts to be amortized from Regulatory assets (liabilities) and Accumulated other comprehensive income into net periodic benefit cost during next fiscal year
 
 
 
Net actuarial loss
$
15

 
$
50

Prior service credit
$
(109
)
 
$
(69
)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table reconciles the obligations, assets and funded status of the plans including amounts recorded as Accrued postretirement liability - affiliates in the Consolidated Statements of Financial Position at December 31:
 
2013
 
2012
 
(In millions)
Change in accumulated postretirement benefit obligation
 
 
 
Accumulated postretirement benefit obligation, beginning of year
$
1,752

 
$
1,868

Service cost
35

 
51

Interest cost
67

 
91

Plan amendments
(159
)
 
(207
)
Actuarial (gain) loss
(200
)
 
12

Medicare Part D subsidy
1

 
5

Benefits paid
(66
)
 
(68
)
Accumulated postretirement benefit obligation, end of year
$
1,430

 
$
1,752

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
756

 
$
651

Actual return on plan assets
131

 
88

Company contributions
239

 
95

Benefits paid
(65
)
 
(78
)
Plan assets at fair value, end of year
$
1,061

 
$
756

Funded status, end of year
$
(369
)
 
$
(996
)
Amount recorded as:
 
 
 
Non-current liabilities
$
(369
)
 
$
(996
)
Amounts recognized in Regulatory assets (liabilities) (see Note 8)
 
 
 
Net actuarial loss
$
255

 
$
560

Prior service cost
(303
)
 
(244
)
 
$
(48
)
 
$
316
Schedule of Expected Benefit Payments [Table Text Block]
At December 31, 2013, the benefits expected to be paid, including prescription drug benefits, in each of the next five years and in the aggregate for the five fiscal years thereafter are as follows:
 
(In millions)
2014
$
78

2015
83

2016
87

2017
93

2018
98

2019-2023
555

 
$
994
Schedule of Assumptions Used [Table Text Block]
Assumptions used in determining the accumulated postretirement benefit obligation and net other postretirement benefit costs are listed below:
 
2013
 
2012
 
2011
Accumulated postretirement benefit obligation
 
 
 
 
 
Discount rate
4.95
%
 
4.15
%
 
5.00
%
Health care trend rate pre- and post- 65
7.50
 / 6.50%
 
7.00
%
 
7.00
%
Ultimate health care trend rate
4.50
%
 
5.00
%
 
5.00
%
Year in which ultimate reached pre- and post- 65
2025 / 2024

 
2021

 
2020

Other postretirement benefit costs
 

 
 

 
 

Discount rate (prior to interim remeasurement)
4.15
%
 
5.00
%
 
5.50
%
Discount rate (post interim remeasurement)
4.30
%
 
N/A

 
N/A

Expected long-term rate of return on plan assets
8.25
%
 
8.25
%
 
8.75
%
Health care trend rate pre- and post- 65
7.00
%
 
7.00
%
 
7.00
%
Ultimate health care trend rate
5.00
%
 
5.00
%
 
5.00
%
Year in which ultimate reached
2021

 
2020

 
2019
Schedule of Allocation of Plan Assets [Table Text Block]
Target allocations for other postretirement benefit plan assets as of December 31, 2013 are listed below:
U.S. Large Cap Equity Securities
17
%
U.S. Small Cap and Mid Cap Equity Securities
4

Non U.S. Equity Securities
20

Fixed Income Securities
25

Hedge Funds and Similar Investments
20

Private Equity and Other
14

 
100
%
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3):
 
Year Ended December 31, 2013
 
Year Ended December 31, 2012
 
Hedge Funds and Similar Investments
 
Private Equity and Other
 
Total
 
Hedge Funds and Similar Investments
 
Private Equity and Other
 
Total
 
(In millions)
Beginning Balance at January 1
$
78

 
$
57

 
$
135

 
$
63

 
$
39

 
$
102

Total realized/unrealized gains (losses):
 
 
 
 


 
 
 
 
 
 
Realized gains (losses)
—

 
2

 
2

 
4

 
(7
)
 
(3
)
Unrealized gains
10

 
5

 
15

 
—

 
9

 
9

Purchases, sales and settlements:
 
 
 
 


 
 
 
 
 


Purchases
23

 
14

 
37

 
56

 
25

 
81

Sales
—

 
(7
)
 
(7
)
 
(45
)
 
(9
)
 
(54
)
Ending Balance at December 31
$
111

 
$
71

 
$
182

 
$
78

 
$
57

 
$
135

The amount of total gains for the period attributable to the change in unrealized gains or losses related to assets still held at the end of the period
$
10

 
$
6

 
$
16

 
$
4

 
$
1

 
$
5
Other Postretirement Benefit Plans Hierachy Level [Table Text Block]
Fair Value Measurements for other postretirement benefit plan assets at December 31, 2013 and 2012 (a):
 
December 31, 2013
 
December 31, 2012
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Asset Category:
(In millions)
Short-term investments (b)
$
3

 
$
—

 
$
—

 
$
3

 
$
1

 
$
1

 
$
—

 
$
2

Equity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Large Cap (c)
208

 
—

 
—

 
208

 
122

 
2

 
—

 
124

U.S. Small/Mid Cap (d)
103

 
—

 
—

 
103

 
70

 
—

 
—

 
70

Non U.S. (e)
197

 
5

 
—

 
202

 
151

 
4

 
—

 
155

Fixed income securities (f)
12

 
243

 
—

 
255

 
25

 
162

 
—

 
187

Hedge Funds and Similar Investments (g)
91

 
17

 
111

 
219

 
68

 
15

 
78

 
161

Private Equity and Other (h)
—

 
—

 
71

 
71

 
—

 
—

 
57

 
57

Total
$
614

 
$
265

 
$
182

 
$
1,061

 
$
437

 
$
184

 
$
135

 
$
756


_______________________________________
(a)
See Note 3 — Fair Value for a description of levels within the fair value hierarchy.
(b)
This category predominantly represents certain short-term fixed income securities and money market investments that are managed in separate accounts or commingled funds. Pricing for investments in this category are obtained from quoted prices in actively traded markets or valuations from brokers or pricing services.
(c)
This category comprises both actively and not actively managed portfolios that track the S&P 500 low cost equity index funds. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.
(d)
This category represents portfolios of small and medium capitalization domestic equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.
(e)
This category primarily consists of portfolios of non-U.S. developed and emerging market equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.
(f)
This category includes corporate bonds from diversified industries, U.S. Treasuries, bank loans and mortgage backed securities. Pricing for investments in this category is obtained from quoted prices in actively traded markets and quotations from broker or pricing services. Non-exchange traded securities and exchange-traded securities held in commingled funds are classified as Level 2 assets.
(g)
This category utilizes a diversified group of strategies that attempt to capture financial market inefficiencies and includes publicly traded debt and equity, publicly traded mutual funds, commingled and limited partnership funds and non-exchange traded securities. Pricing for Level 1 and Level 2 assets in this category is obtained from quoted prices in actively traded markets and quoted prices from broker or pricing services. Non-exchange traded securities held in commingled funds are classified as Level 2 assets. Valuations for some Level 3 assets in this category may be based on limited observable inputs as there may be little, if any, publicly available pricing.
(h)
This category includes a diversified group of funds and strategies that primarily invests in private equity partnerships. This category also includes investments in timber and private mezzanine debt. Pricing for investments in this category is based on limited observable inputs as there is little, if any, publicly available pricing. Valuations for assets in this category may be based on discounted cash flow analyses, relevant publicly-traded comparables and comparable transactions.