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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2013
Pension Plan, 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
$
94

 
$
82

 
$
69

Interest cost
192

 
204

 
202

Expected return on plan assets
(266
)
 
(244
)
 
(246
)
Amortization of:
 
 
 
 
 
Net loss
208

 
176

 
142

Prior service cost
—

 
—

 
3

Special termination benefits
—

 
2

 
2

Net pension cost
$
228

 
$
220

 
$
172
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
$
(581
)
 
$
395

Amortization of net actuarial loss
(208
)
 
(178
)
Total recognized Regulatory assets and Other comprehensive income
$
(789
)
 
$
217

Total recognized in net periodic pension cost, Regulatory assets and Other comprehensive income
$
(561
)
 
$
437

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
$
151

 
$
202
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table reconciles the obligations, assets and funded status of the plans as well as the amounts 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
$
4,068

 
$
4,349

Change in projected benefit obligation
 
 
 
Projected benefit obligation, beginning of year
$
4,729

 
$
4,195

Service cost
94

 
82

Interest cost
192

 
204

Plan amendments
(3
)
 
—

Actuarial (gain) loss
(400
)
 
474

Special termination benefits
—

 
2

Benefits paid
(232
)
 
(228
)
Projected benefit obligation, end of year
$
4,380

 
$
4,729

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
3,223

 
$
2,886

Actual return on plan assets
445

 
325

Company contributions
284

 
240

Benefits paid
(232
)
 
(228
)
Plan assets at fair value, end of year
$
3,720

 
$
3,223

Funded status of the plans
$
(660
)
 
$
(1,506
)
Amount recorded as:
 
 
 
Current liabilities
$
(7
)
 
$
(8
)
Noncurrent liabilities
(653
)
 
(1,498
)
 
$
(660
)
 
$
(1,506
)
Amounts recognized in Accumulated other comprehensive loss, pre-tax
 
 
 
Net actuarial loss
$
174

 
$
205

Prior service (credit)
(1
)
 
(2
)
 
$
173

 
$
203

Amounts recognized in Regulatory assets (see Note 11)
 
 
 
Net actuarial loss
$
1,654

 
$
2,413

Prior service cost
6

 
7

 
$
1,660

 
$
2,420
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
$
242

2015
250

2016
258

2017
268

2018
280

2019-2023
1,529

 
$
2,827
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)
$
22

 
$
—

 
$
—

 
$
22

 
$
—

 
$
24

 
$
—

 
$
24

Equity securities
 

 
 

 
 

 
 
 
 

 
 

 
 

 


U.S. Large Cap (c)
896

 
—

 
—

 
896

 
688

 
44

 
—

 
732

U.S. Small/Mid Cap (d)
221

 
—

 
—

 
221

 
153

 
5

 
—

 
158

Non U.S. (e)
611

 
130

 
—

 
741

 
530

 
120

 
—

 
650

Fixed income securities (f)
16

 
921

 
—

 
937

 
87

 
765

 
—

 
852

Hedge Funds and Similar Investments (g)
268

 
70

 
395

 
733

 
209

 
80

 
339

 
628

Private Equity and Other (h)
—

 
—

 
170

 
170

 
—

 
—

 
179

 
179

Total
$
2,034

 
$
1,121

 
$
565

 
$
3,720

 
$
1,667

 
$
1,038

 
$
518

 
$
3,223

_______________________________________
(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
Investments
 
Private Equity
and Other
 
Total
 
Hedge Funds
and Similar
Investments
 
Private Equity
and Other
 
Total
 
(In millions)
Beginning Balance at January 1
$
339

 
$
179

 
$
518

 
$
296

 
$
168

 
$
464

Total realized/unrealized gains (losses):
 
 
 
 
 
 
 
 
 
 
 
Realized gains (losses)
—

 
18

 
18

 
18

 
(6
)
 
12

Unrealized gains (losses)
40

 
(14
)
 
26

 
(5
)
 
12

 
7

Purchases, sales and settlements:
 
 
 
 
 
 
 
 
 
 
 
Purchases
16

 
15

 
31

 
250

 
33

 
283

Sales
—

 
(28
)
 
(28
)
 
(220
)
 
(28
)
 
(248
)
Ending Balance at December 31
$
395

 
$
170

 
$
565

 
$
339

 
$
179

 
$
518

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
$
38

 
$
3

 
$
41

 
$
16

 
$
6

 
$
22
Other Postretirement Benefit Plan, 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
$
47

 
$
68

 
$
64

Interest cost
88

 
120

 
121

Expected return on plan assets
(110
)
 
(92
)
 
(94
)
Amortization of:
 

 
 

 
 

Net loss
64

 
80

 
55

Prior service credit
(131
)
 
(27
)
 
(26
)
Net transition asset
—

 
2

 
2

Net other postretirement cost (benefit)
$
(42
)
 
$
151

 
$
122
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
$
(353
)
 
$
(34
)
Amortization of net actuarial loss
(64
)
 
(80
)
Prior service credit
(218
)
 
(264
)
Amortization of prior service credit
131

 
27

Amortization of transition asset
—

 
(2
)
Total recognized in Regulatory assets (liabilities) and Other comprehensive income
$
(504
)
 
$
(353
)
Total recognized in net periodic benefit cost, Regulatory assets (liabilities) and Other comprehensive income
$
(546
)
 
$
(202
)
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
$
21

 
$
69

Prior service credit
$
(144
)
 
$
(91
)
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 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
$
2,315

 
$
2,470

Service cost
47

 
68

Interest cost
88

 
120

Plan amendments
(218
)
 
(264
)
Actuarial (gain) loss
(267
)
 
5

Medicare Part D subsidy
1

 
6

Benefits paid
(88
)
 
(90
)
Accumulated postretirement benefit obligation, end of year
$
1,878

 
$
2,315

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
1,153

 
$
985

Actual return on plan assets
196

 
131

Company contributions
264

 
140

Benefits paid
(86
)
 
(103
)
Plan assets at fair value, end of year
$
1,527

 
$
1,153

Funded status, end of year
$
(351
)
 
$
(1,162
)
Amount recorded as:
 
 
 
Current liabilities
$
(1
)
 
$
(2
)
Noncurrent liabilities
(350
)
 
(1,160
)
 
$
(351
)
 
$
(1,162
)
Amounts recognized in Accumulated other comprehensive loss, pre-tax
 
 
 
Net actuarial loss
$
29

 
$
40

Prior service credit
(10
)
 
(14
)
Net transition asset
—

 
(1
)
 
$
19

 
$
25

Amounts recognized in Regulatory assets (liabilities) (See Note 11)
 
 
 
Net actuarial loss
$
321

 
$
727

Prior service credit
(393
)
 
(302
)
Net transition obligation
—

 
1

 
$
(72
)
 
$
426
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
$
103

2015
110

2016
115

2017
123

2018
130

2019 — 2023
724

 
$
1,305
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
$
119

 
$
86

 
$
205

 
$
95

 
$
60

 
$
155

Total realized/unrealized gains (losses):
 
 
 
 
 
 
 
 
 
 
 
  Realized gains (losses)
—

 
2

 
2

 
6

 
(11
)
 
(5
)
  Unrealized gains
14

 
7

 
21

 
—

 
14

 
14

Purchases, sales and settlements:
 
 
 
 
 
 
 
 
 
 
 
  Purchases
26

 
15

 
41

 
86

 
36

 
122

  Sales
—

 
(9
)
 
(9
)
 
(68
)
 
(13
)
 
(81
)
Ending Balance at December 31
$
159

 
$
101

 
$
260

 
$
119

 
$
86

 
$
205

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
$
14

 
$
9

 
$
23

 
$
6

 
$
2

 
$
8
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)
$
5

 
$
—

 
$
—

 
$
5

 
$
1

 
$
2

 
$
—

 
$
3

Equity securities:
 

 
 

 
 

 
 
 
 

 
 

 
 

 
 
U.S. Large Cap (c)
302

 
—

 
—

 
302

 
189

 
3

 
—

 
192

U.S. Small/Mid Cap (d)
147

 
—

 
—

 
147

 
105

 
—

 
—

 
105

Non U.S. (e)
282

 
9

 
—

 
291

 
230

 
7

 
—

 
237

Fixed income securities (f)
17

 
350

 
—

 
367

 
38

 
247

 
—

 
285

Hedge Funds and Similar Investments (g)
130

 
25

 
159

 
314

 
102

 
24

 
119

 
245

Private Equity and Other (h)
—

 
—

 
101

 
101

 
—

 
—

 
86

 
86

Total
$
883

 
$
384

 
$
260

 
$
1,527

 
$
665

 
$
283

 
$
205

 
$
1,153

_______________________________________
(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.