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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | DTE Energy's long-term debt outstanding and interest rates of debt outstanding at December 31 were:
| Interest Rate(a) |  | Maturity Date |  | 2024 |  | 2023
|  |  |  |  | (In millions)
Mortgage bonds, notes, and other |  |  |  |  |  |  |
DTE Energy debt, unsecured | 4.2% |  | 2025 — 2034 |  | $ | 6,380 |  |  | $ | 5,105 |
DTE Electric debt, principally secured | 3.9% |  | 2025 — 2053 |  | 11,270 |  |  | 10,370 |
DTE Gas debt, principally secured | 4.3% |  | 2025 — 2054 |  | 2,865 |  |  | 2,545 |
|  |  |  |  | 20,515 |  |  | 18,020 |
Unamortized debt discount |  |  |  |  | (28) |  |  | (26) |
Unamortized debt issuance costs |  |  |  |  | (114) |  |  | (100) |
Long-term debt due within one year |  |  |  |  | (1,220) |  |  | (2,075) |
|  |  |  |  | $ | 19,153 |  |  | $ | 15,819 |
Securitization bonds(b) |  |  |  |  |  |  |
DTE Electric securitization bonds | 5.4% |  | 2027 — 2038 |  | $ | 713 |  |  | $ | 777 |
Unamortized debt issuance costs |  |  |  |  | (7) |  |  | (8) |
Long-term debt due within one year |  |  |  |  | (71) |  |  | (64) |
|  |  |  |  | $ | 635 |  |  | $ | 705 |
Junior Subordinated Debentures |  |  |  |  |  |  |
Subordinated debentures | 4.8% |  | 2077 — 2081 |  | $ | 910 |  |  | $ | 910 |
Unamortized debt issuance costs |  |  |  |  | (26) |  |  | (27) |
|  |  |  |  | $ | 884 |  |  | $ | 883 |
_______________________________________ (a)Weighted average interest rate as of December 31, 2024. (b)Bonds are held by DTE Securitization I and DTE Securitization II, special purpose entities consolidated by DTE Electric. Refer to Note 1 to the Consolidated Financial Statements, “Organization and Basis of Presentation,” for additional information regarding these entities and restrictions related to the bonds. DTE Electric's long-term debt outstanding and interest rates of debt outstanding at December 31 were:
| Interest Rate(a) |  | Maturity Date |  | 2024 |  | 2023
|  |  |  |  | (In millions)
Mortgage bonds, notes, and other |  |  |  |  |  |  |
Long-term debt, principally secured | 3.9% |  | 2025 — 2053 |  | $ | 11,270 |  |  | $ | 10,370 |
Unamortized debt discount |  |  |  |  | (22) |  |  | (23) |
Unamortized debt issuance costs |  |  |  |  | (73) |  |  | (73) |
Long-term debt due within one year |  |  |  |  | (350) |  |  | (100) |
|  |  |  |  | $ | 10,825 |  |  | $ | 10,174 |
Securitization bonds(b) |  |  |  |  |  |  |
DTE Electric securitization bonds | 5.4% |  | 2027 — 2038 |  | $ | 713 |  |  | $ | 777 |
Unamortized debt issuance costs |  |  |  |  | (7) |  |  | (8) |
Long-term debt due within one year |  |  |  |  | (71) |  |  | (64) |
|  |  |  |  | $ | 635 |  |  | $ | 705 |
_______________________________________ (a)Weighted average interest rate as of December 31, 2024. (b)Bonds are held by DTE Securitization I and DTE Securitization II, special purpose entities consolidated by DTE Electric. Refer to Note 1 to the Consolidated Financial Statements, “Organization and Basis of Presentation,” for additional information regarding these entities and restrictions related to the bonds.
Schedule of Debt Issued | Refer to the table below for debt issued in 2024:
Company |  | Month |  | Type |  | Interest Rate |  | Maturity Date |  | Amount
|  |  |  |  |  |  |  |  |  | (In millions)
DTE Energy |  | February |  | Senior notes(a) |  | 5.10% |  | 2029 |  | $ | 1,200 |
DTE Electric |  | February |  | Mortgage bonds(b) |  | 4.85% |  | 2026 |  | 500 |
DTE Electric |  | February |  | Mortgage bonds(b) |  | 5.20% |  | 2034 |  | 500 |
DTE Energy |  | May |  | Senior notes(c) |  | 5.85% |  | 2034 |  | 850 |
DTE Energy |  | August |  | Senior notes(d) |  | 4.95% |  | 2027 |  | 1,200 |
DTE Gas |  | October |  | Mortgage bonds(b) |  | 4.87% |  | 2034 |  | 160 |
DTE Gas |  | October |  | Mortgage bonds(b) |  | 5.43% |  | 2054 |  | 160 |
|  |  |  |  |  |  |  |  |  | $ | 4,570 |
_______________________________ (a)Proceeds used for the repayment of short-term borrowings and for general corporate purposes. (b)Proceeds used for the repayment of short-term borrowings, for capital expenditures, and for other general corporate purposes. (c)Proceeds used for the repayment of a portion of the $675 million 2016 Series C 2.53% Senior Notes due October 1, 2024, for repayment of a portion of the $1.3 billion 2019 Series F 4.22% Senior Notes due November 1, 2024, and for general corporate purposes. (d)Proceeds used for the repayment of a portion of the $1.3 billion 2019 Series F 4.22% Senior Notes due November 1, 2024 and for general corporate purposes.
Schedule of Debt Redeemed | Refer to the table below for debt redeemed in 2024:
Company |  | Month |  | Type |  | Interest Rate |  | Maturity Date |  | Amount
|  |  |  |  |  |  |  |  |  | (In millions)
DTE Electric |  | March |  | Mortgage Bonds |  | 3.65% |  | 2024 |  | $ | 100 |
DTE Electric |  | June |  | Securitization bonds |  | 2.64% |  | 2024 |  | 19
DTE Electric |  | September |  | Securitization bonds |  | 5.97% |  | 2024 |  | 24
DTE Energy |  | October |  | Senior notes |  | 2.53% |  | 2024 |  | 675
DTE Energy |  | November |  | Senior notes |  | 4.22% |  | 2024 |  | 1,300
DTE Electric |  | December |  | Securitization bonds |  | 2.64% |  | 2024 |  | 21
|  |  |  |  |  |  |  |  |  | $ | 2,139 |
Schedule of Maturities of Long-term Debt | The following table shows the Registrants' scheduled debt maturities, excluding any unamortized discount on debt:
| 2025 |  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 and Thereafter |  | Total
| (In millions)
DTE Energy(a)(b) | $ | 1,291 |  |  | $ | 1,351 |  |  | $ | 1,430 |  |  | $ | 1,737 |  |  | $ | 1,962 |  |  | $ | 14,367 |  |  | $ | 22,138 |
DTE Electric(b) | $ | 421 |  |  | $ | 751 |  |  | $ | 39 |  |  | $ | 617 |  |  | $ | 103 |  |  | $ | 10,052 |  |  | $ | 11,983 |
_______________________________________ (a)Amounts include DTE Electric's scheduled debt maturities. (b)Amounts include DTE Securitization I and DTE Securitization II scheduled debt maturities.
Scheduled Interest Payments Related to Long-term Debt | The following table shows scheduled interest payments related to the Registrants' long-term debt:
| 2025 |  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030 and Thereafter |  | Total
| (In millions)
DTE Energy(a)(b) | $ | 905 |  |  | $ | 888 |  |  | $ | 806 |  |  | $ | 742 |  |  | $ | 664 |  |  | $ | 8,467 |  |  | $ | 12,472 |
DTE Electric(b) | $ | 477 |  |  | $ | 466 |  |  | $ | 434 |  |  | $ | 426 |  |  | $ | 418 |  |  | $ | 4,874 |  |  | $ | 7,095 |
_______________________________________ (a)Amounts include DTE Electric's scheduled interest payments. (b)Amounts include DTE Securitization I and DTE Securitization II scheduled interest payments.

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