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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The table below represents the pension and other postretirement benefit plans of each Registrant at December 31, 2019:
 
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 provides contributions to the qualified pension plans in:
 
2019
 
2018
 
2017
 
(In millions)
DTE Energy
$
150

 
$
175

 
$
223

DTE Electric
$
100

 
$
175

 
$
185


During 2019, DTE Energy contributed the following amounts of DTE Energy common stock to the DTE Energy Company Affiliates Employee Benefit Plans Master Trust:
Date
 
Number of Shares
 
Price per Share
 
Amount
 
 
 
 
 
 
(In millions)
March 5, 2019
 
814,597
 
$122.76
 
$
100


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
 
2019
 
2018
 
(In millions)
Accumulated benefit obligation, end of year
$
5,387

 
$
4,779

Change in projected benefit obligation
 
 
 
Projected benefit obligation, beginning of year
$
5,124

 
$
5,576

Service cost
84

 
99

Interest cost
219

 
202

Actuarial (gain) loss
719

 
(438
)
Benefits paid
(336
)
 
(315
)
Projected benefit obligation, end of year
$
5,810

 
$
5,124

Change in plan assets
 
 
 
Plan assets at fair value, beginning of year
$
4,273

 
$
4,636

Actual return on plan assets
888

 
(233
)
Company contributions
168

 
185

Benefits paid
(336
)
 
(315
)
Plan assets at fair value, end of year
$
4,993

 
$
4,273

Funded status
$
(817
)
 
$
(851
)
Amount recorded as:
 
 
 
Current liabilities
$
(9
)
 
$
(14
)
Noncurrent liabilities
(808
)
 
(837
)
 
$
(817
)
 
$
(851
)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
 
 
 
Net actuarial loss
$
153

 
$
152

Prior service cost
4

 
5

 
$
157

 
$
157

Amounts recognized in Regulatory assets(a)
 
 
 
Net actuarial loss
$
1,995

 
$
1,973

Prior service credit
(12
)
 
(12
)
 
$
1,983

 
$
1,961

______________________________________
(a)
See Note 10 to the Consolidated Financial Statements, "Regulatory Matters."
Schedule of Net Benefit Costs
Net pension cost for DTE Energy includes the following components:
 
2019
 
2018
 
2017
 
(In millions)
Service cost
$
84

 
$
99

 
$
92

Interest cost
219

 
202

 
214

Expected return on plan assets
(325
)
 
(329
)
 
(311
)
Amortization of:
 
 
 
 
 
Net actuarial loss
133

 
176

 
176

Prior service cost
1

 
—

 
1

Net pension cost
$
112

 
$
148

 
$
172
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
 
2019
 
2018
 
(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss)
 
 
 
Net actuarial loss
$
156

 
$
125

Amortization of net actuarial loss
(133
)
 
(176
)
Amortization of prior service cost
(1
)
 
—

Total recognized in Regulatory assets and Other comprehensive income (loss)
$
22

 
$
(51
)
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss)
$
134

 
$
97

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
$
171

 
$
131

Prior service cost
$
1

 
$
1
Schedule of Expected Benefit Payments
At December 31, 2019, 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)
2020
$
311

2021
319

2022
324

2023
330

2024
334

2025-2029
1,723

Total
$
3,341
Schedule of Assumptions Used
Assumptions used in determining the projected benefit obligation and net pension costs of DTE Energy are:
 
2019
 
2018
 
2017
Projected benefit obligation
 
 
 
 
 
Discount rate
3.28%
 
4.40%
 
3.70%
Rate of compensation increase
4.98%
 
4.98%
 
4.98%
Net pension costs
 
 
 
 
 
Discount rate
4.40%
 
3.70%
 
4.25%
Rate of compensation increase
4.98%
 
4.98%
 
4.65%
Expected long-term rate of return on plan assets
7.30%
 
7.50%
 
7.50%
Schedule of Allocation of Plan Assets
The following tables provide the fair value measurement amounts for DTE Energy's pension plan assets at December 31, 2019 and 2018(a):
 
December 31, 2019
 
December 31, 2018
 
Level 1
 
Level 2
 
Other(b)
 
Total
 
Level 1
 
Level 2
 
Other(b)
 
Total
DTE Energy asset category:
(In millions)
Short-term Investments(c)
$
99

 
$
—

 
$
—

 
$
99

 
$
—

 
$
27

 
$
—

 
$
27

Equity Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Domestic(d)
172

 
—

 
870

 
1,042

 
729

 
4

 
—

 
733

International(e)
387

 
—

 
322

 
709

 
337

 
9

 
240

 
586

Fixed Income Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Governmental(f)
569

 
—

 
—

 
569

 
—

 
868

 
—

 
868

Corporate(g)
—

 
1,452

 
—

 
1,452

 
6

 
1,024

 
—

 
1,030

Hedge Funds and Similar Investments(h)
169

 
—

 
502

 
671

 
88

 
—

 
542

 
630

Private Equity and Other(i)
—

 
—

 
451

 
451

 
—

 
—

 
399

 
399

DTE Energy Total
$
1,396

 
$
1,452

 
$
2,145

 
$
4,993

 
$
1,160

 
$
1,932

 
$
1,181

 
$
4,273

_______________________________________
(a)
For a description of levels within the fair value hierarchy, see Note 13 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, medium and small capitalization domestic equities. Investments in this category include exchange-traded securities for which unadjusted quoted prices can be obtained and exchange-traded securities held in a commingled fund classified as NAV 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 quoted prices can be obtained. Exchange-traded securities held in a commingled fund are classified as NAV assets.
(f)
This category includes U.S. Treasuries, bonds, and other governmental debt. Pricing for investments in this category is obtained from quoted prices in actively traded markets and quotations from broker or pricing services.
(g)
This category primarily consists of corporate bonds from diversified industries, 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.
(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 real estate and private debt. All pricing for investments in this category are classified as NAV assets.
Target allocations for DTE Energy's pension plan assets as of December 31, 2019 are listed below:
U.S. Large Capitalization (Cap) Equity Securities
16
%
U.S. Small Cap and Mid Cap Equity Securities
4

Non-U.S. Equity Securities
15

Fixed Income Securities
42

Hedge Funds and Similar Investments
14

Private Equity and Other
9

 
100
%
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
 
2019
 
2018
 
2019
 
2018
 
(In millions)
Change in accumulated postretirement benefit obligation
 
 
 
 
 
 
 
Accumulated postretirement benefit obligation, beginning of year
$
1,645

 
$
1,910

 
$
1,247

 
$
1,470

Service cost
22

 
27

 
16

 
20

Interest cost
70

 
69

 
53

 
53

Plan amendments
(53
)
 
(44
)
 
(33
)
 
(35
)
Actuarial (gain) loss
153

 
(227
)
 
118

 
(196
)
Benefits paid
(86
)
 
(90
)
 
(64
)
 
(65
)
Accumulated postretirement benefit obligation, end of year
$
1,751

 
$
1,645

 
$
1,337

 
$
1,247

Change in plan assets
 
 
 
 
 
 
 
Plan assets at fair value, beginning of year
$
1,689

 
$
1,848

 
$
1,158

 
$
1,272

Actual return on plan assets
215

 
(75
)
 
141

 
(52
)
Benefits paid
(85
)
 
(84
)
 
(63
)
 
(62
)
Plan assets at fair value, end of year
$
1,819

 
$
1,689

 
$
1,236

 
$
1,158

Funded status
$
68

 
$
44

 
$
(101
)
 
$
(89
)
Amount recorded as:
 
 
 
 
 
 
 
Noncurrent assets
$
69

 
$
45

 
$
266

 
$
189

Current liabilities
(1
)
 
(1
)
 
—

 
—

Noncurrent liabilities
—

 
—

 
(367
)
 
(278
)
 
$
68

 
$
44

 
$
(101
)
 
$
(89
)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
 
 
 
 
 
 
 
Net actuarial (gain) loss
$
(8
)
 
$
1

 
$
—

 
$
—

 
$
(8
)
 
$
1

 
$
—

 
$
—

Amounts recognized in Regulatory assets(a)
 
 
 
 
 
 
 
Net actuarial loss
$
289

 
$
257

 
$
193

 
$
156

Prior service credit
(88
)
 
(44
)
 
(62
)
 
(35
)
 
$
201

 
$
213

 
$
131

 
$
121

______________________________________
(a)
See Note 10 to the Consolidated Financial Statements, "Regulatory Matters."
Schedule of Net Benefit Costs
Net other postretirement credit for DTE Electric includes the following components:
 
2019
 
2018
 
2017
 
(In millions)
Service cost
$
16

 
$
20

 
$
20

Interest cost
53

 
53

 
56

Expected return on plan assets
(65
)
 
(98
)
 
(90
)
Amortization of:
 
 
 
 
 
Net actuarial loss
5

 
8

 
8

Prior service credit
(7
)
 
—

 
(10
)
Net other postretirement cost (credit)
$
2

 
$
(17
)
 
$
(16
)

Net other postretirement credit for DTE Energy includes the following components:
 
2019
 
2018
 
2017
 
(In millions)
Service cost
$
22

 
$
27

 
$
27

Interest cost
70

 
69

 
73

Expected return on plan assets
(96
)
 
(143
)
 
(130
)
Amortization of:
 
 
 
 
 
Net actuarial loss
12

 
11

 
13

Prior service credit
(9
)
 
—

 
(14
)
Net other postretirement credit
$
(1
)
 
$
(36
)
 
$
(31
)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
 
2019
 
2018
 
(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets
 
 
 
Net actuarial (gain) loss
$
41

 
$
(46
)
Amortization of net actuarial loss
(5
)
 
(8
)
Prior service cost
(33
)
 
—

Amortization of prior service (cost) credit
7

 
(35
)
Total recognized in Regulatory assets
$
10

 
$
(89
)
Total recognized in net periodic benefit cost and Regulatory assets
$
12

 
$
(106
)
Estimated amounts to be amortized from Regulatory assets into net periodic benefit cost during next fiscal year
 
 
 
Net actuarial loss
$
11

 
$
5

Prior service credit
$
(14
)
 
$
(7
)

 
2019
 
2018
 
(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss)
 
 
 
Net actuarial (gain) loss
$
34

 
$
(8
)
Amortization of net actuarial loss
(12
)
 
(11
)
Prior service credit
(53
)
 
(44
)
Amortization of prior service credit
9

 
—

Total recognized in Regulatory assets and Other comprehensive income (loss)
$
(22
)
 
$
(63
)
Total recognized in net periodic benefit cost, Regulatory assets, and Other comprehensive income (loss)
$
(23
)
 
$
(99
)
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
$
16

 
$
12

Prior service credit
$
(19
)
 
$
(9
)
Schedule of Expected Benefit Payments
At December 31, 2019, 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)
2020
$
84

 
$
64

2021
88

 
67

2022
92

 
70

2023
94

 
72

2024
96

 
73

2025-2029
496

 
378

Total
$
950

 
$
724
Schedule of Assumptions Used
Assumptions used in determining the accumulated postretirement benefit obligation and net other postretirement benefit costs of the Registrants are:
 
2019
 
2018
 
2017
Accumulated postretirement benefit obligation
 
 
 
 
 
Discount rate
3.29%
 
4.40%
 
3.70%
Health care trend rate pre- and post- 65
6.75 / 7.25%
 
6.75 / 7.25%
 
6.75 / 7.25%
Ultimate health care trend rate
4.50%
 
4.50%
 
4.50%
Year in which ultimate reached pre- and post- 65
2032
 
2031
 
2030
Other postretirement benefit costs
 
 
 
 
 
Discount rate
4.40%
 
3.70%
 
4.25%
Expected long-term rate of return on plan assets
7.30%
 
7.75%
 
7.75%
Health care trend rate pre- and post- 65
6.75 / 7.25%
 
6.75 / 7.25%
 
6.50 / 6.75%
Ultimate health care trend rate
4.50%
 
4.50%
 
4.50%
Year in which ultimate reached pre- and post- 65
2031
 
2030
 
2028
Schedule of Allocation of Plan Assets
Target allocations for the Registrants' other postretirement benefit plan assets as of December 31, 2019 are listed below:
U.S. Large Cap Equity Securities
16
%
U.S. Small Cap and Mid Cap Equity Securities
3

Non-U.S. Equity Securities
16

Fixed Income Securities
37

Hedge Funds and Similar Investments
14

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, 2019 and 2018(a):
 
December 31, 2019
 
December 31, 2018
 
Level 1
 
Level 2
 
Other(b)
 
Total
 
Level 1
 
Level 2
 
Other(b)
 
Total
DTE Energy asset category:
(In millions)
Short-term Investments(c)
$
80

 
$
—

 
$
—

 
$
80

 
$
14

 
$
2

 
$
—

 
$
16

Equity Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Domestic(d)
51

 
—

 
273

 
324

 
300

 
—

 
—

 
300

International(e)
182

 
—

 
89

 
271

 
234

 
—

 
67

 
301

Fixed Income Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Governmental(f)
74

 
—

 
—

 
74

 
—

 
85

 
—

 
85

Corporate(g)
—

 
256

 
251

 
507

 
11

 
265

 
130

 
406

Hedge Funds and Similar Investments(h)
71

 
—

 
182

 
253

 
97

 
—

 
203

 
300

Private Equity and Other(i)
—

 
—

 
310

 
310

 
—

 
—

 
281

 
281

DTE Energy Total
$
458

 
$
256

 
$
1,105

 
$
1,819

 
$
656

 
$
352

 
$
681

 
$
1,689

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric asset category:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Short-term Investments(c)
$
55

 
$
—

 
$
—

 
$
55

 
$
10

 
$
1

 
$
—

 
$
11

Equity Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Domestic(d)
34

 
—

 
185

 
219

 
206

 
—

 
—

 
206

International(e)
124

 
—

 
60

 
184

 
163

 
—

 
45

 
208

Fixed Income Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Governmental(f)
48

 
—

 
—

 
48

 
—

 
53

 
—

 
53

Corporate(g)
—

 
168

 
176

 
344

 
7

 
179

 
92

 
278

Hedge Funds and Similar Investments(h)
49

 
—

 
123

 
172

 
68

 
—

 
139

 
207

Private Equity and Other(i)
—

 
—

 
214

 
214

 
—

 
—

 
195

 
195

DTE Electric Total
$
310

 
$
168

 
$
758

 
$
1,236

 
$
454

 
$
233

 
$
471

 
$
1,158

_______________________________________
(a)
For a description of levels within the fair value hierarchy see Note 13 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, medium and small capitalization domestic equities. Investments in this category include exchange-traded securities for which unadjusted quoted prices can be obtained and exchange-traded securities held in a commingled fund classified as NAV 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 quoted prices can be obtained. Exchange-traded securities held in a commingled fund are classified as NAV assets.
(f)
This category includes U.S. Treasuries, bonds and other governmental debt. Pricing for investments in this category is obtained from quoted prices in actively traded markets and quotations from broker or pricing services.
(g)
This category primarily consists of corporate bonds from diversified industries, 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 real estate and private debt. All investments in this category are classified as NAV assets.