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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Pension Plan  
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
$
83

 
$
94

 
$
82

Interest cost
212

 
192

 
204

Expected return on plan assets
(273
)
 
(266
)
 
(244
)
Amortization of:
 
 
 
 
 
Net loss
157

 
208

 
176

Special termination benefits
—

 
—

 
2

Net pension cost
$
179

 
$
228

 
$
220
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
 
2014
 
2013
 
(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income
 
 
 
Net actuarial (gain) loss
$
805

 
$
(581
)
Amortization of net actuarial loss
(157
)
 
(208
)
Prior service cost
(7
)
 
—

Total recognized in Regulatory assets and Other comprehensive income
$
641

 
$
(789
)
Total recognized in net periodic pension cost, Regulatory assets and Other comprehensive income
$
820

 
$
(561
)
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
$
206

 
$
151
Schedule of Defined Benefit Plans Disclosures
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:
 
2014
 
2013
 
(In millions)
Accumulated benefit obligation, end of year
$
4,853

 
$
4,068

Change in projected benefit obligation
 
 
 
Projected benefit obligation, beginning of year
$
4,380

 
$
4,729

Service cost
83

 
94

Interest cost
212

 
192

Plan amendments
(7
)
 
(3
)
Actuarial (gain) loss
836

 
(400
)
Benefits paid
(235
)
 
(232
)
Projected benefit obligation, end of year
$
5,269

 
$
4,380

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
3,720

 
$
3,223

Actual return on plan assets
301

 
445

Company contributions
195

 
284

Benefits paid
(235
)
 
(232
)
Plan assets at fair value, end of year
$
3,981

 
$
3,720

Funded status of the plans
$
(1,288
)
 
$
(660
)
Amount recorded as:
 
 
 
Current liabilities
$
(8
)
 
$
(7
)
Noncurrent liabilities
(1,280
)
 
(653
)
 
$
(1,288
)
 
$
(660
)
Amounts recognized in Accumulated other comprehensive loss, pre-tax
 
 
 
Net actuarial loss
$
194

 
$
174

Prior service (credit)
(1
)
 
(1
)
 
$
193

 
$
173

Amounts recognized in Regulatory assets (see Note 8)
 
 
 
Net actuarial loss
$
2,285

 
$
1,654

Prior service (credit) cost
(1
)
 
6

 
$
2,284

 
$
1,660
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
$
269

2016
277

2017
286

2018
298

2019
309

2020-2024
1,634

Total
$
3,073
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
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
%
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)
$
46

 
$
—

 
$
—

 
$
46

 
$
22

 
$
—

 
$
—

 
$
22

Equity securities
 

 
 

 
 

 
 
 
 

 
 

 
 

 


U.S. large cap (c)
899

 
—

 
—

 
899

 
896

 
—

 
—

 
896

U.S. small/mid cap (d)
225

 
—

 
—

 
225

 
221

 
—

 
—

 
221

Non U.S. (e)
526

 
219

 
—

 
745

 
611

 
130

 
—

 
741

Fixed income securities (f)
7

 
1,113

 
—

 
1,120

 
16

 
921

 
—

 
937

Hedge funds and similar investments (g)
226

 
95

 
438

 
759

 
268

 
70

 
395

 
733

Private equity and other (h)
—

 
—

 
187

 
187

 
—

 
—

 
170

 
170

Securities lending (i)
(189
)
 
(50
)
 
—

 
(239
)
 
—

 
—

 
—

 
—

Securities lending collateral (i)
189

 
50

 
—

 
239

 
—

 
—

 
—

 
—

Total
$
1,929

 
$
1,427

 
$
625

 
$
3,981

 
$
2,034

 
$
1,121

 
$
565

 
$
3,720

_______________________________________
(a)
For a description of levels within the fair value hierarchy see Note 11 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 Energy 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.
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
$
395

 
$
170

 
$
565

 
$
339

 
$
179

 
$
518

Total realized/unrealized gains (losses)
22

 
16

 
38

 
40

 
4

 
44

Purchases, sales and settlements:
 
 
 
 
 
 
 
 
 
 
 
Purchases
22

 
31

 
53

 
16

 
15

 
31

Sales
(1
)
 
(30
)
 
(31
)
 
—

 
(28
)
 
(28
)
Ending Balance at December 31
$
438

 
$
187

 
$
625

 
$
395

 
$
170

 
$
565

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
$
21

 
$
11

 
$
32

 
$
38

 
$
3

 
$
41
Other Postretirement Benefit Plan  
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
$
34

 
$
47

 
$
68

Interest cost
89

 
88

 
120

Expected return on plan assets
(122
)
 
(110
)
 
(92
)
Amortization of:
 

 
 

 
 

Net loss
20

 
64

 
80

Prior service credit
(144
)
 
(131
)
 
(25
)
Net other postretirement cost (credit)
$
(123
)
 
$
(42
)
 
$
151
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
 
2014
 
2013
 
(In millions)
Other changes in plan assets and APBO recognized in Regulatory assets (liabilities) and Other comprehensive income
 
 
 
Net actuarial (gain) loss
$
192

 
$
(353
)
Amortization of net actuarial loss
(20
)
 
(64
)
Prior service credit
—

 
(218
)
Amortization of prior service credit
144

 
131

Total recognized in Regulatory assets (liabilities) and Other comprehensive income
$
316

 
$
(504
)
Total recognized in net periodic benefit cost, Regulatory assets (liabilities) and Other comprehensive income
$
193

 
$
(546
)
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
$
43

 
$
21

Prior service credit
$
(126
)
 
$
(144
)
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 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
$
1,878

 
$
2,315

Service cost
34

 
47

Interest cost
89

 
88

Plan amendments
—

 
(218
)
Actuarial (gain) loss
131

 
(267
)
Medicare Part D subsidy
—

 
1

Benefits paid
(88
)
 
(88
)
Accumulated postretirement benefit obligation, end of year
$
2,044

 
$
1,878

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
1,527

 
$
1,153

Actual return on plan assets
62

 
196

Company contributions
24

 
264

Benefits paid
(85
)
 
(86
)
Plan assets at fair value, end of year
$
1,528

 
$
1,527

Funded status, end of year
$
(516
)
 
$
(351
)
Amount recorded as:
 
 
 
Current liabilities
$
(1
)
 
$
(1
)
Noncurrent liabilities
(515
)
 
(350
)
 
$
(516
)
 
$
(351
)
Amounts recognized in Accumulated other comprehensive loss, pre-tax
 
 
 
Net actuarial loss
$
34

 
$
29

Prior service credit
(5
)
 
(10
)
 
$
29

 
$
19

Amounts recognized in Regulatory assets (liabilities) (see Note 8)
 
 
 
Net actuarial loss
$
488

 
$
321

Prior service credit
(254
)
 
(393
)
 
$
234

 
$
(72
)
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
$
101

2016
107

2017
111

2018
117

2019
122

2020-2024
660

Total
$
1,218
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)
$
6

 
$
—

 
$
—

 
$
6

 
$
5

 
$
—

 
$
—

 
$
5

Equity securities
 

 
 

 
 

 
 
 
 

 
 

 
 

 
 
U.S. large cap (c)
266

 
—

 
—

 
266

 
302

 
—

 
—

 
302

U.S. small/mid cap (d)
149

 
—

 
—

 
149

 
147

 
—

 
—

 
147

Non U.S. (e)
222

 
59

 
—

 
281

 
282

 
9

 
—

 
291

Fixed income securities (f)
15

 
360

 
—

 
375

 
17

 
350

 
—

 
367

Hedge funds and similar investments (g)
107

 
45

 
168

 
320

 
130

 
25

 
159

 
314

Private equity and other (h)
—

 
—

 
131

 
131

 
—

 
—

 
101

 
101

Securities lending (i)
(141
)
 
(17
)
 
—

 
(158
)
 
—

 
—

 
—

 
—

Securities lending collateral (i)
141

 
17

 
—

 
158

 
—

 
—

 
—

 
—

Total
$
765

 
$
464

 
$
299

 
$
1,528

 
$
883

 
$
384

 
$
260

 
$
1,527

_______________________________________
(a)
For a description of levels within the fair value hierarchy see Note 11 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 Energy 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.
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
%
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
$
159

 
$
101

 
$
260

 
$
119

 
$
86

 
$
205

Total realized/unrealized gains (losses)
8

 
9

 
17

 
14

 
9

 
23

Purchases, sales and settlements:
 
 
 
 
 
 
 
 
 
 
 
Purchases
9

 
33

 
42

 
26

 
15

 
41

Sales
(8
)
 
(12
)
 
(20
)
 
—

 
(9
)
 
(9
)
Ending Balance at December 31
$
168

 
$
131

 
$
299

 
$
159

 
$
101

 
$
260

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
$
7

 
$
8

 
$
15

 
$
14

 
$
9

 
$
23