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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
Net pension cost includes the following components:
 
2014
 
2013
 
2012
 
(In millions)
Service cost
$
64

 
$
73

 
$
64

Interest cost
162

 
146

 
155

Expected return on plan assets
(194
)
 
(184
)
 
(166
)
Amortization of:
 
 
 
 
 
Net loss
110

 
148

 
124

Prior service cost
2

 
1

 
1

Settlements
—

 
—

 
2

Net pension cost
$
144

 
$
184

 
$
180
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
 
2014
 
2013
 
(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income
 
 
 
Net actuarial (gain) loss
$
614

 
$
(418
)
Amortization of net actuarial loss
(110
)
 
(148
)
Prior service cost
(2
)
 
—

Amortization of prior service cost
(2
)
 
(1
)
Total recognized in Regulatory assets and Other comprehensive income
$
500

 
$
(567
)
Total recognized in net periodic pension cost, Regulatory assets and Other comprehensive income
$
644

 
$
(383
)
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
$
149

 
$
106

Prior service cost
$
1

 
$
1
Schedule of Defined Benefit Plans Disclosures
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:
 
2014
 
2013
 
(In millions)
Accumulated benefit obligation, end of year
$
3,712

 
$
3,111

Change in projected benefit obligation
 
 
 
Projected benefit obligation, beginning of year
$
3,341

 
$
3,585

Service cost
64

 
73

Interest cost
162

 
146

Plan amendments
(2
)
 
—

Actuarial (gain) loss
634

 
(286
)
Benefits paid
(181
)
 
(177
)
Projected benefit obligation, end of year
$
4,018

 
$
3,341

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
2,632

 
$
2,211

Actual return on plan assets
212

 
316

Company contributions
149

 
282

Benefits paid
(181
)
 
(177
)
Plan assets at fair value, end of year
$
2,812

 
$
2,632

Funded status of the plan
$
(1,206
)
 
$
(709
)
Amount recorded as:

 

Current liabilities
$
(6
)
 
$
(4
)
Noncurrent liabilities
(1,200
)
 
(705
)
 
$
(1,206
)
 
$
(709
)
Amounts recognized in Regulatory assets (see Note 7 - "Regulatory Matters")

 

Net actuarial loss
$
1,738

 
$
1,248

Prior service cost
5

 
9

 
$
1,743

 
$
1,257
Schedule of Expected Benefit Payments
At December 31, 2014, 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)
2015
$
210

2016
216

2017
223

2018
233

2019
239

2020 - 2024
1,264

Total
$
2,385
Schedule of Assumptions Used
Assumptions used in determining the projected benefit obligation and net pension costs are listed below:
 
2014
 
2013
 
2012
Projected benefit obligation
 
 
 
 
 
Discount rate
4.12%
 
4.95%
 
4.15%
Rate of compensation increase
4.65%
 
4.20%
 
4.20%
Net pension costs
 
 
 
 
 
Discount rate
4.95%
 
4.15%
 
5.00%
Rate of compensation increase
4.20%
 
4.20%
 
4.20%
Expected long-term rate of return on plan assets
7.75%
 
8.25%
 
8.25%
Schedule of Allocation of Plan Assets
Fair Value Measurements for pension plan assets at December 31, 2014 and 2013 (a):
 
December 31, 2014
 
December 31, 2013
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
 
(In millions)
Asset category:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term investments (b)
$
33

 
$
—

 
$
—

 
$
33

 
$
15

 
$
—

 
$
—

 
$
15

Equity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. large cap (c)
638

 
—

 
—

 
638

 
639

 
—

 
—

 
639

U.S. small/mid cap (d)
162

 
—

 
—

 
162

 
160

 
—

 
—

 
160

Non U.S. (e)
378

 
157

 
—

 
535

 
440

 
94

 
—

 
534

Fixed income securities (f)
5

 
758

 
—

 
763

 
11

 
623

 
—

 
634

Hedge funds and similar investments (g)
163

 
68

 
315

 
546

 
193

 
50

 
285

 
528

Private equity and other (h)
—

 
—

 
135

 
135

 
—

 
—

 
122

 
122

Securities lending (i)
(136
)
 
(36
)
 
—

 
(172
)
 
—

 
—

 
—

 
—

Securities lending collateral (i)
136

 
36

 
—

 
172

 
—

 
—

 
—

 
—

Total
$
1,379

 
$
983

 
$
450

 
$
2,812

 
$
1,458

 
$
767

 
$
407

 
$
2,632


_______________________________________
(a)
For a description of levels within the fair value hierarchy see Note 9 to the Consolidated financial Statements, "Fair Value".
(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.
(i)
In 2014, DTE Electric began a securities lending program with a third party agent. The program allows the agent to lend certain securities from the Company's pension trusts to selected entities against receipt of collateral (in the form of cash) as provided for and determined in accordance with its securities lending agency agreement.
Target allocations for pension plan assets as of December 31, 2014 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
%
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets
Fair Value Measurements Using Significant Unobservable Inputs (Level 3):
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
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
$
285

 
$
122

 
$
407

 
$
238

 
$
125

 
363

Total realized/unrealized gains (losses)
15

 
12

 
27

 
29

 
2

 
31

Purchases, sales and settlements:
 
 
 
 


 
 
 
 
 
 
Purchases
16

 
22

 
38

 
18

 
15

 
33

Sales
(1
)
 
(21
)
 
(22
)
 
—

 
(20
)
 
(20
)
Ending Balance at December 31
$
315

 
$
135

 
$
450

 
$
285


$
122


$
407

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
$
15

 
$
8

 
$
23

 
$
27

 
$
2

 
$
29
Other Postretirement Benefit Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
Net other postretirement cost includes the following components:
 
2014
 
2013
 
2012
 
(In millions)
Service cost
$
26

 
$
35

 
$
51

Interest cost
68

 
67

 
91

Expected return on plan assets
(85
)
 
(74
)
 
(61
)
Amortization of:
 
 
 
 
 
Net loss
14

 
47

 
58

Prior service credit
(109
)
 
(100
)
 
(14
)
Net other postretirement cost (credit)
$
(86
)
 
$
(25
)
 
$
125
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
 
2014
 
2013
 
(In millions)
Other changes in plan assets and APBO recognized in Regulatory assets (liabilities) and Other comprehensive income
 
 
 
Net actuarial gain
$
144

 
$
(258
)
Amortization of net actuarial loss
(14
)
 
(47
)
Prior service credit
—

 
(159
)
Amortization of prior service credit
109

 
100

Total recognized in Regulatory assets (liabilities) and Other comprehensive income
$
239

 
$
(364
)
Total recognized in net periodic benefit cost, Regulatory assets (liabilities) and Other comprehensive income
$
153

 
$
(389
)
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
$
31

 
$
15

Prior service credit
$
(94
)
 
$
(109
)
Schedule of Defined Benefit Plans Disclosures
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:
 
2014
 
2013
 
(In millions)
Change in accumulated postretirement benefit obligation
 
 
 
Accumulated postretirement benefit obligation, beginning of year
$
1,430

 
$
1,752

Service cost
26

 
35

Interest cost
68

 
67

Plan amendments
—

 
(159
)
Actuarial (gain) loss
100

 
(200
)
Medicare Part D subsidy
—

 
1

Benefits paid
(66
)
 
(66
)
Accumulated postretirement benefit obligation, end of year
$
1,558

 
$
1,430

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
1,061

 
$
756

Actual return on plan assets
41

 
131

Company contributions
—

 
239

Benefits paid
(64
)
 
(65
)
Plan assets at fair value, end of year
$
1,038

 
$
1,061

Funded status, end of year
$
(520
)
 
$
(369
)
Amount recorded as:
 
 
 
Noncurrent liabilities
$
(520
)
 
$
(369
)
Amounts recognized in Regulatory assets (liabilities) (see Note 7 - "Regulatory Matters")
 
 
 
Net actuarial loss
$
385

 
$
255

Prior service cost
(194
)
 
(303
)
 
$
191

 
$
(48
)
Schedule of Expected Benefit Payments
At December 31, 2014, 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)
2015
$
77

2016
82

2017
85

2018
89

2019
93

2020 - 2024
505

Total
$
931
Schedule of Assumptions Used
Assumptions used in determining the accumulated postretirement benefit obligation and net other postretirement benefit costs are listed below:
 
2014
 
2013
 
2012
Accumulated postretirement benefit obligation
 
 
 
 
 
Discount rate
4.10%
 
4.95%
 
4.15%
Health care trend rate pre- and post- 65
7.50 / 6.50%
 
7.50 / 6.50%
 
7.00%
Ultimate health care trend rate
4.50%
 
4.50%
 
5.00%
Year in which ultimate reached pre- and post- 65
2025 / 2024
 
2025 / 2024
 
2021
Other postretirement benefit costs
 
 
 
 
 
Discount rate (prior to interim remeasurement)
4.95%
 
4.15%
 
5.00%
Discount rate (post interim remeasurement)
N/A
 
4.30%
 
N/A
Expected long-term rate of return on plan assets
8.00%
 
8.25%
 
8.25%
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
Schedule of Allocation of Plan Assets
Target allocations for other postretirement benefit plan assets as of December 31, 2014 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
%
Fair Value Measurements for other postretirement benefit plan assets at December 31, 2014 and 2013 (a):
 
December 31, 2014
 
December 31, 2013
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Asset category:
(In millions)
Short-term investments (b)
$
4

 
$
—

 
$
—

 
$
4

 
$
3

 
$
—

 
$
—

 
$
3

Equity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. large cap (c)
179

 
—

 
—

 
179

 
208

 
—

 
—

 
208

U.S. small/mid cap (d)
102

 
—

 
—

 
102

 
103

 
—

 
—

 
103

Non U.S. (e)
151

 
39

 
—

 
190

 
197

 
5

 
—

 
202

Fixed income securities (f)
11

 
243

 
—

 
254

 
12

 
243

 
—

 
255

Hedge funds and similar investments (g)
73

 
31

 
114

 
218

 
91

 
17

 
111

 
219

Private equity and other (h)
—

 
—

 
91

 
91

 
—

 
—

 
71

 
71

Securities lending (i)
(98
)
 
(11
)
 
—

 
(109
)
 
—

 
—

 
—

 
—

Securities lending collateral (i)
98

 
11

 
—

 
109

 
—

 
—

 
—

 
—

Total
$
520

 
$
313

 
$
205

 
$
1,038

 
$
614

 
$
265

 
$
182

 
$
1,061


_______________________________________
(a)
For a description of levels within the fair value hierarchy see Note 9 to the Consolidated Financial Statements, "Fair Value".
(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.
(i)
In 2014, DTE Electric began a securities lending program with a third party agent. The program allows the agent to lend certain securities from the Company's VEBA trust to selected entities against receipt of collateral (in the form of cash) as provided for and determined in accordance with its securities lending agency agreement.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets
Fair Value Measurements Using Significant Unobservable Inputs (Level 3):
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
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
$
111

 
$
71

 
$
182

 
$
78

 
$
57

 
$
135

Total realized/unrealized gains (losses)
5

 
6

 
11

 
10

 
7

 
17

Purchases, sales and settlements:
 
 
 
 


 
 
 
 
 


Purchases
4

 
22

 
26

 
23

 
14

 
37

Sales
(6
)
 
(8
)
 
(14
)
 
—

 
(7
)
 
(7
)
Ending Balance at December 31
$
114

 
$
91

 
$
205

 
$
111

 
$
71

 
$
182

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
$
5

 
$
5

 
$
10

 
$
10

 
$
6

 
$
16