Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2020

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments

DTE Energy's long-term debt outstanding and weighted average interest rates of debt outstanding at December 31 were:

	Interest Rate(a)	Maturity Date	2020		2019
			(In millions)
Mortgage bonds, notes, and other
DTE Energy Debt, Unsecured	2.7%	2022 — 2033	$	8,175	$	6,625
DTE Electric Taxable Debt, Principally Secured	3.9%	2021 — 2050	8,030		6,930
DTE Electric Tax-Exempt Revenue Bonds(b)	4.1%	2021 — 2030	278		310
DTE Gas Taxable Debt, Principally Secured	4%	2023 — 2050	1,910		1,710
			18,393		15,575
Unamortized debt discount			(25)		(24)
Unamortized debt issuance costs			(104)		(91)
Long-term debt due within one year			(462)		(682)
			$	17,802	$	14,778
Junior Subordinated Debentures
Subordinated Debentures	5.3%	2076 — 2080	$	1,210	$	1,180
Unamortized debt issuance costs			(35)		(34)
			$	1,175	$	1,146

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(a)Weighted average interest rate as of December 31, 2020.

(b)DTE Electric Tax-Exempt Revenue Bonds are issued by a public body that loans the proceeds to DTE Electric on terms substantially mirroring the Revenue Bonds.

DTE Electric's long-term debt outstanding and weighted average interest rates of debt outstanding at December 31 were:

	Interest Rate(a)	Maturity Date	2020		2019
			(In millions)
Mortgage bonds, notes, and other
Taxable Debt, Principally Secured	3.9%	2021 — 2050	$	8,030	$	6,930
Tax-Exempt Revenue Bonds(b)	4.1%	2021 — 2030	278		310
			8,308		7,240
Unamortized debt discount			(16)		(15)
Unamortized debt issuance costs			(56)		(45)
Long-term debt due within one year			(462)		(632)
			$	7,774	$	6,548

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(a)Weighted average interest rate as of December 31, 2020.

(b)Tax-Exempt Revenue Bonds are issued by a public body that loans the proceeds to DTE Electric on terms substantially mirroring the Revenue Bonds.

Selected information about DTE Energy’s Equity Units is presented below:

Issuance Date	Units Issued	Total Net Proceeds		Total Long-Term Debt		RSN Annual Interest Rate	Stock Purchase Contract Annual Rate	Stock Purchase Settlement Date	Stock Purchase Contract Liability(a)		RSN Maturity Date
(In millions, except interest rates)
11/1/19	26	$	1,268	$	1,300	2.25%	4.0%	11/1/2022	$	150	11/1/2025

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(a)Payments of $49 million were made in 2020. The stock purchase contract liability was $101 million and $150 million as of December 31, 2020 and 2019, respectively, exclusive of interest.

Schedule of Issued Debt

In 2020, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	February	Mortgage Bonds(a)	2.25%	2030	$	600
DTE Electric	February	Mortgage Bonds(a)	2.95%	2050	500
DTE Electric	April	Mortgage Bonds(b)	2.63%	2031	600
DTE Energy	August	Senior Notes(c)	1.05%	2025	800
DTE Gas	August	Mortgage Bonds(d)	2.35%	2030	125
DTE Gas	August	Mortgage Bonds(d)	3.20%	2050	125
DTE Energy	October	Junior Subordinated Debentures(e)	4.38%	2080	230
DTE Energy	October	Senior Notes(f)	0.55%	2022	750
					$	3,730

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(a)Proceeds used for the repayment of $300 million of DTE Electric's 2010 Series A 4.89% Senior Notes due 2020, repayment of short-term borrowings, capital expenditures, and for other general corporate purposes.

(b)Proceeds used for the repayment of $300 million of DTE Electric's 2010 Series B 3.45% Senior Notes due 2020, repayment of $32 million of DTE Electric's 2008 Series KT Variable Rate Senior Notes due 2020, repayment of short-term borrowings, capital expenditures, and for other general corporate purposes.

(c)Proceeds used for the repayment of short-term borrowings and for general corporate purposes.

(d)Proceeds used for the repayment of $50 million of DTE Gas's 2008 Series I 6.36% Senior Notes due 2020 and for general corporate purposes, including capital expenditures.

(e)Proceeds used for the repayment of $200 million of DTE Energy's 2012 Series C 5.25% Junior Subordinated Debentures due 2062 and for general corporate purposes.

(f)Proceeds used for the repayment of DTE Energy's $500 million unsecured term loan expiring March 2021, repayment of DTE Energy's $167 million unsecured term loan expiring June 2021, and general corporate purposes.

Schedule of Debt Redeemed

In 2020, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	March	Senior Notes	4.89%	2020	$	300
DTE Electric	July	Senior Notes	5.63%	2020	32
DTE Electric	July	Senior Notes	3.45%	2020	300
DTE Gas	September	Senior Notes	6.36%	2020	50
DTE Energy	October	Junior Subordinated Debentures	5.25%	2062	200
					$	882

Schedule of Maturities of Long-term Debt

The following table shows the Registrants' scheduled debt maturities, excluding any unamortized discount on debt:

	2021		2022		2023		2024		2025		2026 and Thereafter		Total
	(In millions)
DTE Energy(a)	$	462	$	3,466	$	1,177	$	1,425	$	1,220	$	11,853	$	19,603
DTE Electric	$	462	$	316	$	202	$	400	$	350	$	6,578	$	8,308

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(a)Amounts include DTE Electric's scheduled debt maturities.