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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
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 |  | 2022 |  | 2021
|  |  |  |  | (In millions)
Mortgage bonds, notes, and other |  |  |  |  |  |  |
DTE Energy debt, unsecured | 3.4% |  | 2023 — 2030 |  | $ | 5,105 |  |  | $ | 5,555 |
DTE Electric debt, principally secured | 3.7% |  | 2023 — 2052 |  | 9,572 |  |  | 8,988 |
DTE Gas debt, principally secured | 4.0% |  | 2023 — 2052 |  | 2,325 |  |  | 2,065 |
|  |  |  |  | 17,002 |  |  | 16,608 |
Unamortized debt discount |  |  |  |  | (26) |  |  | (23) |
Unamortized debt issuance costs |  |  |  |  | (92) |  |  | (90) |
Long-term debt due within one year |  |  |  |  | (1,077) |  |  | (2,866) |
|  |  |  |  | $ | 15,807 |  |  | $ | 13,629 |
Securitization bonds(b) |  |  |  |  |  |  |
DTE Electric securitization bonds | 2.8% |  | 2027 — 2036 |  | $ | 215 |  |  | $ | — |
Unamortized debt issuance costs |  |  |  |  | (4) |  |  |
Long-term debt due within one year |  |  |  |  | (39) |  |  | — |
|  |  |  |  | $ | 172 |  |  | $ | — |
Junior Subordinated Debentures |  |  |  |  |  |  |
Subordinated debentures | 4.8% |  | 2077 — 2081 |  | $ | 910 |  |  | $ | 910 |
Unamortized debt issuance costs |  |  |  |  | (27) |  |  | (27) |
|  |  |  |  | $ | 883 |  |  | $ | 883 |
_______________________________________ (a)Weighted average interest rate as of December 31, 2022. (b)Bonds are held by DTE Securitization, a special purpose entity consolidated by DTE Electric. Refer to Note 1 to the Consolidated Financial Statements, “Organization and Basis of Presentation,” for additional information regarding DTE Securitization and restrictions related to these bonds. DTE Electric's long-term debt outstanding and interest rates of debt outstanding at December 31 were:
| Interest Rate(a) |  | Maturity Date |  | 2022 |  | 2021
|  |  |  |  | (In millions)
Mortgage bonds, notes, and other |  |  |  |  |  |  |
Long-term debt, principally secured | 3.7% |  | 2023 — 2052 |  | $ | 9,572 |  |  | $ | 8,988 |
Unamortized debt discount |  |  |  |  | (22) |  |  | (19) |
Unamortized debt issuance costs |  |  |  |  | (65) |  |  | (62) |
Long-term debt due within one year |  |  |  |  | (203) |  |  | (316) |
|  |  |  |  | $ | 9,282 |  |  | $ | 8,591 |
Securitization bonds(b) |  |  |  |  |  |  |
DTE Electric securitization bonds | 2.8% |  | 2027 — 2036 |  | $ | 215 |  |  | $ | — |
Unamortized debt issuance costs |  |  |  |  | (4) |  |  |
Long-term debt due within one year |  |  |  |  | (39) |  |  | — |
|  |  |  |  | $ | 172 |  |  | $ | — |
_______________________________________ (a)Weighted average interest rate as of December 31, 2022. (b)Bonds are held by DTE Securitization, a special purpose entity consolidated by DTE Electric. Refer to Note 1 to the Consolidated Financial Statements, “Organization and Basis of Presentation,” for additional information regarding DTE Securitization and restrictions related to these bonds.
Schedule of Debt Issued | In 2022, the following debt was issued:
Company |  | Month |  | Type |  | Interest Rate |  | Maturity Date |  | Amount
|  |  |  |  |  |  |  |  |  | (In millions)
DTE Electric |  | February |  | Mortgage bonds(a) |  | 3.00% |  | 2032 |  | $ | 500 |
DTE Electric |  | February |  | Mortgage bonds(b) |  | 3.65% |  | 2052 |  | 400 |
DTE Electric |  | March |  | Securitization bonds(c) |  | 2.64% |  | 2027(d) |  | 184 |
DTE Electric |  | March |  | Securitization bonds(c) |  | 3.11% |  | 2036(e) |  | 52 |
DTE Energy |  | August |  | Term loan facility draw |  | Variable |  | 2023 |  | 400 |
DTE Gas |  | September |  | Mortgage bonds(a) |  | 4.76% |  | 2032 |  | 130 |
DTE Gas |  | September |  | Mortgage bonds(a) |  | 5.05% |  | 2052 |  | 130 |
DTE Energy |  | November |  | Term loan facility draw |  | Variable |  | 2023 |  | 200 |
DTE Energy |  | December |  | Term loan facility draw |  | Variable |  | 2023 |  | 200 |
|  |  |  |  |  |  |  |  |  | $ | 2,196 |
_______________________________________ (a)Proceeds used for the repayment of short-term borrowings, for capital expenditures, and for other general corporate purposes. (b)Bonds were issued as Green Bonds with proceeds to be used for eligible green expenditures, including costs related to the generation of solar and wind energy, purchases of renewable energy from wind and solar power facilities, and energy optimization programs. (c)Proceeds were used to reimburse DTE Electric for qualified costs previously incurred, including the net book value of the River Rouge generation plant, tree trimming surge program costs, and other qualified costs. The securitization financing order from the MPSC required that the net proceeds be subsequently applied by DTE Electric to retire existing debt or equity. Accordingly, DTE Electric used proceeds of $115 million towards retirement of the 2012 Series A Mortgage bonds noted in the Debt Redemptions table below and issued a one-time special dividend of $115 million to DTE Energy. Refer to Note 9 to the Consolidated Financial Statements, “Regulatory Matters,” for additional information. (d)Principal payments on the bonds are being made semi-annually beginning December 2022, with the final payment scheduled for December 2026. (e)Principal payments on the bonds will be made semi-annually beginning June 2027, with the final payment scheduled for December 2035.
Schedule of Debt Redeemed | In 2022, the following debt was redeemed:
Company |  | Month |  | Type |  | Interest Rate |  | Maturity Date |  | Amount
|  |  |  |  |  |  |  |  |  | (In millions)
DTE Electric |  | March |  | Mortgage bonds |  | 2.65% |  | 2022 |  | $ | 250 |
DTE Electric |  | September |  | Mortgage bonds |  | 6.95% |  | 2022 |  | 66 |
DTE Energy |  | November |  | Senior Notes |  | 2.25% |  | 2022 |  | 500 |
DTE Energy |  | November |  | Senior Notes |  | 0.55% |  | 2022 |  | 750 |
DTE Electric |  | December |  | Securitization Bonds |  | 2.64% |  | 2022 |  | 21 |
|  |  |  |  |  |  |  |  |  | $ | 1,587 |
Schedule of Maturities of Long-term Debt | The following table shows the Registrants' scheduled debt maturities, excluding any unamortized discount on debt:
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 and Thereafter |  | Total
| (In millions)
DTE Energy(a)(b) | $ | 1,116 |  |  | $ | 2,416 |  |  | $ | 1,261 |  |  | $ | 819 |  |  | $ | 196 |  |  | $ | 12,319 |  |  | $ | 18,127 |
DTE Electric(b) | $ | 242 |  |  | $ | 440 |  |  | $ | 391 |  |  | $ | 219 |  |  | $ | 5 |  |  | $ | 8,490 |  |  | $ | 9,787 |
_______________________________________ (a)Amounts include DTE Electric's scheduled debt maturities. (b)Amounts include DTE Securitization 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:
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 and Thereafter |  | Total
| (In millions)
DTE Energy(a)(b) | $ | 669 |  |  | $ | 601 |  |  | $ | 511 |  |  | $ | 495 |  |  | $ | 469 |  |  | $ | 7,712 |  |  | $ | 10,457 |
DTE Electric(b) | $ | 357 |  |  | $ | 340 |  |  | $ | 325 |  |  | $ | 316 |  |  | $ | 310 |  |  | $ | 4,375 |  |  | $ | 6,023 |
_______________________________________ (a)Amounts include DTE Electric's scheduled interest payments. (b)Amounts include DTE Securitization scheduled interest payments.

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