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Retirement Benefits and Trusteed Assets (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023:
Registrants
DTE EnergyDTE Electric
Qualified Pension Plans
DTE Energy Company Retirement PlanXX
DTE Gas Company Retirement Plan for Employees Covered by Collective Bargaining AgreementsX
Shenango Inc. Pension Plan(a)
X
Non-qualified Pension Plans
DTE Energy Company Supplemental Retirement Plan(b)
XX
DTE Energy Company Executive Supplemental Retirement Plan(b)
XX
DTE Energy Company Supplemental Severance Benefit PlanX
Other Postretirement Benefit Plans
The DTE Energy Company Comprehensive Non-Health Welfare PlanXX
The DTE Energy Company Comprehensive Retiree Group Health Care PlanXX
DTE Supplemental Retiree Benefit PlanXX
DTE Energy Company Retiree Reimbursement Arrangement PlanXX
_____________________________________
(a)Sponsored by Shenango, LLC
(b)Sponsored by DTE Energy 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
20232022
(In millions)
Accumulated benefit obligation, end of year$4,089 $4,078 
Change in projected benefit obligation
Projected benefit obligation, beginning of year$4,309 $5,857 
Service cost57 95 
Interest cost214 166 
Actuarial (gain) loss74 (1,252)
Benefits paid(329)(278)
Settlements(7)(279)
Projected benefit obligation, end of year$4,318 $4,309 
Change in plan assets
Plan assets at fair value, beginning of year$3,897 $5,507 
Actual return on plan assets363 (1,062)
Company contributions36 9 
Benefits paid(329)(278)
Settlements(7)(279)
Plan assets at fair value, end of year$3,960 $3,897 
Funded status$(358)$(412)
Amount recorded as:
Current liabilities$(8)$(34)
Noncurrent liabilities(350)(378)
$(358)$(412)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
Net actuarial loss$76 $85 
$76 $85 
Amounts recognized in Regulatory assets(a)
Net actuarial loss$1,426 $1,369 
Prior service credit(5)(7)
$1,421 $1,362 
______________________________________
(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:
202320222021
(In millions)
Service cost$57 $95 $108 
Interest cost214 166 158 
Expected return on plan assets(352)(346)(339)
Amortization of:
Net actuarial loss7 115 196 
Prior service credit(2)(1)— 
Settlements7 94 16 
Net pension cost (credit)$(69)$123 $139 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
20232022
(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss)
Net actuarial loss$62 $156 
Amortization of net actuarial loss and settlements(14)(209)
Amortization of prior service credit2 1 
Total recognized in Regulatory assets and Other comprehensive income (loss)$50 $(52)
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss)$(19)$71 
Schedule of Expected Benefit Payments
At December 31, 2023, the benefits related to DTE Energy's qualified and non-qualified 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)
2024$319 
2025328 
2026322 
2027321 
2028324 
2029-20331,605 
Total$3,219 
Schedule of Assumptions Used
Assumptions used in determining the projected benefit obligation and net pension costs of DTE Energy are:
202320222021
Projected benefit obligation
Discount rate5.00%5.19%2.91%
Rate of compensation increase3.80%3.80%3.80%
Cash balance interest crediting rate3.60%3.40%2.40%
Net pension costs
Discount rate5.19%2.91%2.57%
Rate of compensation increase3.80%3.80%3.80%
Expected long-term rate of return on plan assets7.60%6.80%7.00%
Cash balance interest crediting rate3.40%2.40%2.00%
Schedule of Allocation of Plan Assets
Target allocations for DTE Energy's pension plan assets as of December 31, 2023 are listed below:
U.S. Large Capitalization (Cap) Equity Securities12 %
U.S. Small Cap and Mid Cap Equity Securities2 
Non-U.S. Equity Securities11 
Fixed Income Securities48 
Hedge Funds and Similar Investments8 
Private Equity and Other19 
100 %
The following table provides the fair value measurement amounts for DTE Energy's pension plan assets at December 31, 2023 and 2022(a):
December 31, 2023December 31, 2022
Level 1Level 2
Other(b)
TotalLevel 1Level 2
Other(b)
Total
DTE Energy asset category:(In millions)
Short-term Investments(c)
$100 $— $— $100 $77 $— $— $77 
Equity Securities
Domestic(d)
— — 550 550 — — 483 483 
International(e)
55 — 309 364 65 — 416 481 
Fixed Income Securities
Governmental(f)
531 78 — 609 506 77 — 583 
Corporate(g)
— 1,323 — 1,323 — 1,203 — 1,203 
Hedge Funds and Similar Investments(h)
104 68 110 282 86 50 185 321 
Private Equity and Other(i)
— — 732 732 — — 749 749 
DTE Energy Total$790 $1,469 $1,701 $3,960 $734 $1,330 $1,833 $3,897 
_______________________________________
(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 is obtained from quoted prices in actively traded markets.
(d)This category represents portfolios of large, medium and small capitalization domestic equities. Investments in this category include 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 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.
(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 quotations from broker or pricing services.
(h)This category utilizes a diversified group of strategies that attempt to capture uncorrelated sources of return and includes publicly traded mutual funds, insurance-linked and asset-backed securities, commingled funds and limited partnership funds. Pricing for mutual funds in this category is obtained from quoted prices in actively traded markets. Pricing for insurance-linked and asset-backed securities is obtained from quotations from broker or pricing services. 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 private real estate and private debt. All investments in this category are classified as NAV assets.
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 EnergyDTE Electric
2023202220232022
(In millions)
Change in accumulated postretirement benefit obligation
Accumulated postretirement benefit obligation, beginning of year$1,293 $1,702 $982 $1,293 
Service cost17 27 13 20 
Interest cost65 48 49 37 
Actuarial (gain) loss(5)(395)2 (301)
Benefits paid(87)(89)(64)(67)
Accumulated postretirement benefit obligation, end of year$1,283 $1,293 $982 $982 
Change in plan assets
Plan assets at fair value, beginning of year$1,577 $2,021 $1,052 $1,355 
Actual return on plan assets124 (359)81 (239)
Benefits paid(87)(85)(63)(64)
Plan assets at fair value, end of year$1,614 $1,577 $1,070 $1,052 
Funded status$331 $284 $88 $70 
Amount recorded as:
Noncurrent assets$633 $571 $378 $345 
Current liabilities(1)— — — 
Noncurrent liabilities(301)(287)(290)(275)
$331 $284 $88 $70 
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
Net actuarial gain$(13)$(14)$— $— 
Amounts recognized in Regulatory assets(a)
Net actuarial loss$173 $201 $73 $80 
Prior service credit(10)(29)(6)(20)
$163 $172 $67 $60 
______________________________________
(a)See Note 9 to the Consolidated Financial Statements, "Regulatory Matters."
Schedule of Net Benefit Costs
Net other postretirement credit for DTE Energy includes the following components:
202320222021
(In millions)
Service cost$17 $27 $30 
Interest cost65 48 46 
Expected return on plan assets(111)(126)(129)
Amortization of:
Net actuarial loss10 4 13 
Prior service credit(19)(19)(19)
Net other postretirement credit$(38)$(66)$(59)
Net other postretirement credit for DTE Electric includes the following components:
202320222021
(In millions)
Service cost$13 $20 $23 
Interest cost49 37 35 
Expected return on plan assets(73)(85)(86)
Amortization of:
Net actuarial loss1 5 11 
Prior service credit(14)(14)(14)
Net other postretirement credit$(24)$(37)$(31)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
20232022
(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$(17)$90 
Amortization of net actuarial loss(10)(4)
Prior service cost— 1 
Amortization of prior service credit19 19 
Total recognized in Regulatory assets and Other comprehensive income (loss)$(8)$106 
Total recognized in net periodic benefit cost, Regulatory assets, and Other comprehensive income (loss)$(46)$40 
20232022
(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets
Net actuarial (gain) loss$(6)$24 
Amortization of net actuarial loss(1)(5)
Amortization of prior service credit14 14 
Total recognized in Regulatory assets$7 $33 
Total recognized in net periodic benefit cost and Regulatory assets$(17)$(4)
Schedule of Expected Benefit Payments
At December 31, 2023, 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 EnergyDTE Electric
(In millions)
2024$84 $64 
202588 67 
202689 68 
202791 70 
202892 71 
2029-2033482 369 
Total$926 $709 
Schedule of Assumptions Used
Assumptions used in determining the accumulated postretirement benefit obligation and net other postretirement benefit costs of the Registrants are:
202320222021
Accumulated postretirement benefit obligation
Discount rate5.00%5.19%2.91%
Health care trend rate pre- and post- 65
7.75 / 8.25%
6.75 / 7.25%
6.75 / 7.25%
Ultimate health care trend rate4.50%4.50%4.50%
Year in which ultimate reached pre- and post- 65203520352034
Other postretirement benefit costs
Discount rate5.19%2.91%2.58%
Expected long-term rate of return on plan assets7.20%6.40%6.70%
Health care trend rate pre- and post- 65
6.75 / 7.25%
6.75 / 7.25%
6.75 / 7.25%
Ultimate health care trend rate4.50%4.50%4.50%
Year in which ultimate reached pre- and post- 65203520342033
Schedule of Allocation of Plan Assets
Target allocations for the Registrants' other postretirement benefit plan assets as of December 31, 2023 are listed below:
U.S. Large Cap Equity Securities5 %
Non-U.S. Equity Securities4 
Fixed Income Securities61 
Hedge Funds and Similar Investments9 
Private Equity and Other21 
100 %
The following tables provide the fair value measurement amounts for the Registrants' other postretirement benefit plan assets at December 31, 2023 and 2022(a):
December 31, 2023December 31, 2022
Level 1Level 2
Other(b)
TotalLevel 1Level 2
Other(b)
Total
(In millions)
DTE Energy asset category:
Short-term Investments(c)
$41 $— $— $41 $35 $— $— $35 
Equity Securities
Domestic(d)
— — 76 76 — — 78 78 
International(e)
7 — 43 50 9 — 61 70 
Fixed Income Securities
Governmental(f)
242 31 — 273 264 32 — 296 
Corporate(g)
— 459 212 671 — 396 194 590 
Hedge Funds and Similar Investments(h)
18 21 86 125 31 22 94 147 
Private Equity and Other(i)
— — 378 378 — — 361 361 
DTE Energy Total$308 $511 $795 $1,614 $339 $450 $788 $1,577 
DTE Electric asset category:
Short-term Investments(c)
$27 $— $— $27 $23 $— $— $23 
Equity Securities
Domestic(d)
— — 48 48 — — 50 50 
International(e)
4 — 27 31 5 — 39 44 
Fixed Income Securities
Governmental(f)
161 21 — 182 178 21 — 199 
Corporate(g)
— 302 145 447 — 262 134 396 
Hedge Funds and Similar Investments(h)
11 14 58 83 20 15 63 98 
Private Equity and Other(i)
— — 252 252 — — 242 242 
DTE Electric Total$203 $337 $530 $1,070 $226 $298 $528 $1,052 
_______________________________________
(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 is obtained from quoted prices in actively traded markets.
(d)This category represents portfolios of large, medium and small capitalization domestic equities. Investments in this category include 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 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.
(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 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 uncorrelated sources of return and includes publicly traded mutual funds, insurance-linked and asset-backed securities, commingled funds and limited partnership funds. Pricing for mutual funds in this category is obtained from quoted prices in actively traded markets. Pricing for insurance-linked and asset-backed securities is obtained from quotations from broker or pricing services. 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 private real estate and private debt. All investments in this category are classified as NAV assets.
Schedule of Accumulated Benefit Obligations in Excess of Plan Assets
The following table reflects other postretirement benefit plans with accumulated postretirement benefit obligations in excess of plan assets as of December 31:
DTE EnergyDTE Electric
2023202220232022
(In millions)
Accumulated postretirement benefit obligation$628 $625 $592 $591 
Fair value of plan assets326 338 302 316 
Accumulated postretirement benefit obligation in excess of plan assets$302 $287 $290 $275 
Retiree healthcare plan (VEBA)  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of VEBA Contributions The following table provides contributions to the VEBA in:
202320222021
(In millions)
DTE Energy$16 $16 $18 
DTE Electric$7 $7 $8