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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The following table provides cash contributions to the qualified pension plans as of December 31:
 
2017
 
2016
 
2015
 
(In millions)
DTE Energy
$
223

 
$
179

 
$
177

DTE Electric
185

 
145

 
145

The table below represents the pension and other postretirement benefit plans which employees of each Registrant participated at December 31, 2017:
 
Registrants
 
DTE Energy
 
DTE Electric
Qualified Pension Plans
 
 
 
DTE Energy Company Retirement Plan
X
 
X
DTE Gas Company Retirement Plan for Employees Covered by Collective Bargaining Agreements
X
 
 
Shenango Inc. Pension Plan
X
 
 
Nonqualified Pension Plans
 
 
 
DTE Energy Company Supplemental Retirement Plan
X
 
X
DTE Energy Company Executive Supplemental Retirement Plan(a)
X
 
X
DTE Energy Company Supplemental Severance Benefit Plan
X
 
 
Other Postretirement Benefit Plans
 
 
 
The DTE Energy Company Comprehensive Non-Health Welfare Plan
X
 
X
The DTE Energy Company Comprehensive Retiree Group Health Care Plan
X
 
X
DTE Supplemental Retiree Benefit Plan
X
 
X
DTE Energy Company Retiree Reimbursement Arrangement Plan
X
 
X
_____________________________________
(a)
Sponsored by the DTE Energy subsidiary, DTE Energy Holding Company.
Pension Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
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 DTE Energy's Consolidated Statements of Financial Position at December 31:
 
DTE Energy
 
2017
 
2016
 
(In millions)
Accumulated benefit obligation, end of year
$
5,149

 
$
4,753

Change in projected benefit obligation
 
 
 
Projected benefit obligation, beginning of year
$
5,171

 
$
4,971

Service cost
92

 
92

Interest cost
214

 
219

Plan amendments
(11
)
 
7

Actuarial loss
391

 
141

Benefits paid
(281
)
 
(259
)
Projected benefit obligation, end of year
$
5,576

 
$
5,171

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
4,012

 
$
3,832

Actual return on plan assets
674

 
253

Company contributions
231

 
186

Benefits paid
(281
)
 
(259
)
Plan assets at fair value, end of year
$
4,636

 
$
4,012

Funded status
$
(940
)
 
$
(1,159
)
Amount recorded as:
 
 
 
Current liabilities
$
(16
)
 
$
(7
)
Noncurrent liabilities
(924
)
 
(1,152
)
 
$
(940
)
 
$
(1,159
)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
 
 
 
Net actuarial loss
$
163

 
$
163

Prior service cost
6

 
8

 
$
169

 
$
171

Amounts recognized in Regulatory assets(a)
 
 
 
Net actuarial loss
$
2,014

 
$
2,163

Prior service credit
(14
)
 
(4
)
 
$
2,000

 
$
2,159

______________________________________
(a)
See Note 9 to the Consolidated Financial Statements, "Regulatory Matters."
Schedule of Net Benefit Costs
Net pension cost for DTE Energy includes the following components:
 
2017
 
2016
 
2015
 
(In millions)
Service cost
$
92

 
$
92

 
$
100

Interest cost
214

 
219

 
210

Expected return on plan assets
(311
)
 
(309
)
 
(296
)
Amortization of:
 
 
 
 
 
Net actuarial loss
176

 
164

 
205

Prior service cost
1

 
1

 
—

Other
—

 
—

 
2

Net pension cost
$
172

 
$
167

 
$
221
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
 
2017
 
2016
 
(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss)
 
 
 
Net actuarial loss
$
27

 
$
197

Amortization of net actuarial loss
(176
)
 
(164
)
Prior service cost (credit)
(11
)
 
7

Amortization of prior service cost
(1
)
 
(1
)
Total recognized in Regulatory assets and Other comprehensive income (loss)
$
(161
)
 
$
39

Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss)
$
11

 
$
206

Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year
 
 
 
Net actuarial loss
$
178

 
$
172

Prior service cost
$
—

 
$
1
Schedule of Expected Benefit Payments
At December 31, 2017, the benefits related to DTE Energy'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)
2018
$
299

2019
301

2020
316

2021
317

2022
323

2023-2027
1,692

Total
$
3,248
Schedule of Assumptions Used
Assumptions used in determining the projected benefit obligation and net pension costs of DTE Energy are:
 
2017
 
2016
 
2015
Projected benefit obligation
 
 
 
 
 
Discount rate
3.70%
 
4.25%
 
4.50%
Rate of compensation increase
4.98%
 
4.65%
 
4.65%
Net pension costs
 
 
 
 
 
Discount rate
4.25%
 
4.50%
 
4.12%
Rate of compensation increase
4.65%
 
4.65%
 
4.65%
Expected long-term rate of return on plan assets
7.50%
 
7.75%
 
7.75%
Schedule of Allocation of Plan Assets
Target allocations for DTE Energy's pension plan assets as of December 31, 2017 are listed below:
U.S. Large Capitalization (Cap) Equity Securities
18
%
U.S. Small Cap and Mid Cap Equity Securities
5

Non-U.S. Equity Securities
17

Fixed Income Securities
32

Hedge Funds and Similar Investments
20

Private Equity and Other
8

 
100
%
The following tables provide the fair value measurement amounts for DTE Energy's pension plan assets at December 31, 2017 and 2016(a):
 
December 31, 2017
 
December 31, 2016
 
Level 1
 
Level 2
 
Other(b)
 
Total
 
Level 1
 
Level 2
 
Other(b)
 
Total
 
(In millions)
DTE Energy asset category:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term Investments(c)
$
—

 
$
114

 
$
—

 
$
114

 
$
—

 
$
22

 
$
—

 
$
22

Equity Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 


U.S. Large Cap(d)
821

 
5

 
—

 
826

 
875

 
5

 
—

 
880

U.S. Small Cap and Mid Cap(e)
229

 
5

 
—

 
234

 
229

 
3

 
—

 
232

Non-U.S.(f)
529

 
13

 
280

 
822

 
479

 
18

 
269

 
766

Fixed Income Securities(g)
1

 
1,453

 
—

 
1,454

 
1

 
1,037

 
52

 
1,090

Hedge Funds and Similar Investments(h)
265

 
—

 
593

 
858

 
231

 
—

 
578

 
809

Private Equity and Other(i)
—

 
—

 
328

 
328

 
—

 
—

 
213

 
213

Securities Lending(j)
(53
)
 
(13
)
 
—

 
(66
)
 
(53
)
 
(25
)
 
—

 
(78
)
Securities Lending Collateral(j)
53

 
13

 
—

 
66

 
53

 
25

 
—

 
78

DTE Energy Total
$
1,845

 
$
1,590

 
$
1,201

 
$
4,636

 
$
1,815

 
$
1,085

 
$
1,112

 
$
4,012

_______________________________________
(a)
For a description of levels within the fair value hierarchy, see Note 12 to the Consolidated Financial Statements, "Fair Value."
(b)
Amounts represent assets valued at NAV as a practical expedient for fair value.
(c)
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.
(d)
This category represents portfolios of large capitalization domestic equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained.
(e)
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.
(f)
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 NAV assets.
(g)
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 NAV assets.
(h)
This category utilizes a diversified group of strategies that attempt to capture financial market inefficiencies and includes publicly traded mutual funds, commingled funds and limited partnership funds. Pricing for mutual funds in this category is obtained from quoted prices in actively traded markets. Commingled funds or limited partnership funds are classified as NAV assets.
(i)
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. All pricing for investments in this category are classified as NAV assets.
(j)
DTE Energy has a securities lending program with a third-party agent. The program allows the agent to lend certain securities from DTE Energy's pension trusts to selected entities against receipt of collateral (in the form of cash) as provided for and determined in accordance with their securities lending agency agreements.
Other postretirement benefit plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
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 Registrants' Consolidated Statements of Financial Position at December 31:
 
DTE Energy
 
DTE Electric
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Change in accumulated postretirement benefit obligation
 
 
 
 
 
 
 
Accumulated postretirement benefit obligation, beginning of year
$
1,795

 
$
1,846

 
$
1,373

 
$
1,414

Service cost
27

 
27

 
20

 
20

Interest cost
73

 
80

 
56

 
61

Actuarial (gain) loss
101

 
(75
)
 
84

 
(62
)
Benefits paid
(86
)
 
(83
)
 
(63
)
 
(60
)
Accumulated postretirement benefit obligation, end of year
$
1,910

 
$
1,795

 
$
1,470

 
$
1,373

Change in plan assets
 
 
 
 
 
 
 
Plan assets at fair value, beginning of year
$
1,758

 
$
1,617

 
$
1,218

 
$
1,131

Actual return on plan assets
252

 
122

 
172

 
87

Company contributions
—

 
20

 
—

 
—

Benefits paid
(162
)
 
(1
)
 
(118
)
 
—

Plan assets at fair value, end of year
$
1,848

 
$
1,758

 
$
1,272

 
$
1,218

Funded status
$
(62
)
 
$
(37
)
 
$
(198
)
 
$
(155
)
Amount recorded as:
 
 
 
 
 
 
 
Noncurrent assets
$
—

 
$
—

 
$
113

 
$
114

Current liabilities
(1
)
 
(1
)
 
—

 
—

Noncurrent liabilities
(61
)
 
(36
)
 
(311
)
 
(269
)
 
$
(62
)
 
$
(37
)
 
$
(198
)
 
$
(155
)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
 
 
 
 
 
 
 
Net actuarial (gain) loss
$
(1
)
 
$
12

 
$
—

 
$
—

 
$
(1
)
 
$
12

 
$
—

 
$
—

Amounts recognized in Regulatory assets(a)
 
 
 
 
 
 
 
Net actuarial loss
$
279

 
$
300

 
$
211

 
$
217

Prior service credit
(1
)
 
(14
)
 
—

 
(10
)
 
$
278

 
$
286

 
$
211

 
$
207

______________________________________
(a)
See Note 9 to the Consolidated Financial Statements, "Regulatory Matters."
Schedule of Net Benefit Costs
Net other postretirement credit for DTE Electric includes the following components:
 
2017
 
2016
 
2015
 
(In millions)
Service cost
$
20

 
$
20

 
$
25

Interest cost
56

 
61

 
62

Expected return on plan assets
(90
)
 
(90
)
 
(90
)
Amortization of:
 
 
 
 
 
Net actuarial loss
8

 
21

 
31

Prior service credit
(10
)
 
(89
)
 
(95
)
Net other postretirement credit
$
(16
)
 
$
(77
)
 
$
(67
)
Net other postretirement credit for DTE Energy includes the following components:
 
2017
 
2016
 
2015
 
(In millions)
Service cost
$
27

 
$
27

 
$
34

Interest cost
73

 
80

 
81

Expected return on plan assets
(130
)
 
(129
)
 
(131
)
Amortization of:
 
 
 
 
 
Net actuarial loss
13

 
30

 
43

Prior service credit
(14
)
 
(118
)
 
(126
)
Other
—

 
(1
)
 
—

Net other postretirement credit
$
(31
)
 
$
(111
)
 
$
(99
)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
 
2017
 
2016
 
(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss)
 
 
 
Net actuarial gain
$
(21
)
 
$
(68
)
Amortization of net actuarial loss
(13
)
 
(30
)
Prior service credit
(1
)
 
—

Amortization of prior service credit
14

 
119

Total recognized in Regulatory assets and Other comprehensive income (loss)
$
(21
)
 
$
21

Total recognized in net periodic benefit cost, Regulatory assets, and Other comprehensive income (loss)
$
(52
)
 
$
(90
)
Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year
 
 
 
Net actuarial loss
$
11

 
$
16

Prior service credit
$
(1
)
 
$
(14
)
 
2017
 
2016
 
(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets
 
 
 
Net actuarial (gain) loss
$
2

 
$
(59
)
Amortization of net actuarial loss
(8
)
 
(21
)
Amortization of prior service credit
10

 
89

Total recognized in Regulatory assets
$
4

 
$
9

Total recognized in net periodic benefit cost and Regulatory assets
$
(12
)
 
$
(68
)
Estimated amounts to be amortized from Regulatory assets into net periodic benefit cost during next fiscal year
 
 
 
Net actuarial loss
$
8

 
$
10

Prior service credit
$
—

 
$
(10
)
Schedule of Expected Benefit Payments
At December 31, 2017, 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 for the Registrants are as follows:
 
DTE Energy
 
DTE Electric
 
(In millions)
2018
$
94

 
$
73

2019
99

 
77

2020
103

 
80

2021
105

 
82

2022
108

 
84

2023-2027
567

 
437

Total
$
1,076

 
$
833
Schedule of Assumptions Used
Assumptions used in determining the accumulated postretirement benefit obligation and net other postretirement benefit costs of the Registrants are:
 
2017
 
2016
 
2015
Accumulated postretirement benefit obligation
 
 
 
 
 
Discount rate
3.70%
 
4.25%
 
4.50%
Health care trend rate pre- and post- 65
6.75 / 7.25%
 
6.50 / 6.75%
 
6.25 / 6.75%
Ultimate health care trend rate
4.50%
 
4.50%
 
4.50%
Year in which ultimate reached pre- and post- 65
2030
 
2028
 
2027
Other postretirement benefit costs
 
 
 
 
 
Discount rate
4.25%
 
4.50%
 
4.10%
Expected long-term rate of return on plan assets
7.75%
 
8.00%
 
8.00%
Health care trend rate pre- and post- 65
6.50 / 6.75%
 
6.25 / 6.75%
 
7.50 / 6.50%
Ultimate health care trend rate
4.50%
 
4.50%
 
4.50%
Year in which ultimate reached pre- and post- 65
2028
 
2027
 
2025 / 2024
Schedule of Allocation of Plan Assets
Target allocations for the Registrants' other postretirement benefit plan assets as of December 31, 2017 are listed below:
U.S. Large Cap Equity Securities
16
%
U.S. Small Cap and Mid Cap Equity Securities
4

Non-U.S. Equity Securities
20

Fixed Income Securities
26

Hedge Funds and Similar Investments
20

Private Equity and Other
14

 
100
%

The following tables provide the fair value measurement amounts for the Registrants' other postretirement benefit plan assets at December 31, 2017 and 2016(a):
 
December 31, 2017
 
December 31, 2016
 
Level 1
 
Level 2
 
Other(b)
 
Total
 
Level 1
 
Level 2
 
Other(b)
 
Total
DTE Energy asset category:
(In millions)
Short-term Investments(c)
$
13

 
$
2

 
$
—

 
$
15

 
$
39

 
$
1

 
$
—

 
$
40

Equity Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Large Cap(d)
284

 
—

 
—

 
284

 
284

 
—

 
—

 
284

U.S. Small Cap and Mid Cap(e)
131

 
—

 
—

 
131

 
156

 
—

 
—

 
156

Non-U.S.(f)
288

 
1

 
77

 
366

 
262

 
1

 
61

 
324

Fixed Income Securities(g)
29

 
324

 
130

 
483

 
15

 
299

 
125

 
439

Hedge Funds and Similar Investments(h)
116

 
—

 
219

 
335

 
114

 
—

 
224

 
338

Private Equity and Other(i)
—

 
—

 
234

 
234

 
—

 
—

 
177

 
177

Securities Lending(j)
(39
)
 
(1
)
 
—

 
(40
)
 
(28
)
 
(3
)
 
—

 
(31
)
Securities Lending Collateral(j)
39

 
1

 
—

 
40

 
28

 
3

 
—

 
31

DTE Energy Total
$
861

 
$
327

 
$
660

 
$
1,848

 
$
870

 
$
301

 
$
587

 
$
1,758

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric asset category:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term Investments(c)
$
9

 
$
1

 
$
—

 
$
10

 
$
28

 
$
1

 
$
—

 
$
29

Equity Securities
 
 
 
 
 
 


 
 
 
 
 
 
 


U.S. Large Cap(d)
195

 
—

 
—

 
195

 
195

 
—

 
—

 
195

U.S. Small Cap and Mid Cap(e)
91

 
—

 
—

 
91

 
109

 
—

 
—

 
109

Non-U.S.(f)
200

 
1

 
52

 
253

 
182

 
1

 
41

 
224

Fixed Income Securities(g)
20

 
218

 
92

 
330

 
10

 
203

 
90

 
303

Hedge Funds and Similar Investments(h)
80

 
—

 
150

 
230

 
80

 
—

 
154

 
234

Private Equity and Other(i)
—

 
—

 
163

 
163

 
—

 
—

 
124

 
124

Securities Lending(j)
(27
)
 
(1
)
 
—

 
(28
)
 
(20
)
 
(1
)
 
—

 
(21
)
Securities Lending Collateral(j)
27

 
1

 
—

 
28

 
20

 
1

 
—

 
21

DTE Electric Total
$
595

 
$
220

 
$
457

 
$
1,272

 
$
604

 
$
205

 
$
409

 
$
1,218

_______________________________________
(a)
For a description of levels within the fair value hierarchy see Note 12 to the Consolidated Financial Statements, "Fair Value."
(b)
Amounts represent assets valued at NAV as a practical expedient for fair value.
(c)
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.
(d)
This category represents portfolios of large capitalization domestic equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained.
(e)
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.
(f)
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 NAV assets.
(g)
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 NAV assets.
(h)
This category utilizes a diversified group of strategies that attempt to capture financial market inefficiencies and includes publicly traded mutual funds, commingled funds and limited partnership funds. Pricing for mutual funds in this category is obtained from quoted prices in actively traded markets. Commingled funds and limited partnership funds are classified as NAV assets.
(i)
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. All investments in this category are classified as NAV assets.
(j)
The Registrants have a securities lending program with a third-party agent. The program allows the agent to lend certain securities from the Registrants' VEBA trust to selected entities against receipt of collateral (in the form of cash) as provided for and determined in accordance with their securities lending agency agreements.
Target allocations for the Registrants' other postretirement benefit plan assets as of December 31, 2017 are listed below:
U.S. Large Cap Equity Securities
16
%
U.S. Small Cap and Mid Cap Equity Securities
4

Non-U.S. Equity Securities
20

Fixed Income Securities
26

Hedge Funds and Similar Investments
20

Private Equity and Other
14

 
100
%