Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

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	2019			2018
			(In millions)
Mortgage bonds, notes, and other
DTE Energy Debt, Unsecured	3.2%	2022 — 2033	$	6,625		$	4,425
DTE Electric Taxable Debt, Principally Secured	4.2%	2020 — 2049	6,930			6,280
DTE Electric Tax-Exempt Revenue Bonds(b)	4.3%	2020 — 2030	310			310
DTE Gas Taxable Debt, Principally Secured	4.3%	2020 — 2049	1,710			1,550
Other Long-Term Debt, including Non-Recourse Debt			—			1
			15,575			12,566
Unamortized debt discount			(24		)	(16		)
Unamortized debt issuance costs			(91		)	(73		)
Long-term debt due within one year			(682		)	(1,495		)
			$	14,778		$	10,982
Junior Subordinated Debentures
Subordinated Debentures	5.5%	2062 — 2077	$	1,180		$	1,180
Unamortized debt issuance costs			(34		)	(35		)
			$	1,146		$	1,145

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(a) Weighted average interest rate as of December 31, 2019.

(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	2019			2018
			(In millions)
Mortgage bonds, notes, and other
Taxable Debt, Principally Secured	4.2%	2020 — 2049	$	6,930		$	6,280
Tax-Exempt Revenue Bonds(b)	4.3%	2020 — 2030	310			310
			7,240			6,590
Unamortized debt discount			(15		)	(11		)
Unamortized debt issuance costs			(45		)	(41		)
Long-term debt due within one year			(632		)	—
			$	6,548		$	6,538

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(a) Weighted average interest rate as of December 31, 2019.

(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 2019 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		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

Schedule of Issued Debt

In 2019, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	February	Mortgage Bonds(a)	3.95%	2049	$	650
DTE Energy	June	Senior Notes(b)	2.60%	2022	300
DTE Energy	June	Senior Notes(b)	3.40%	2029	500
DTE Gas	October	Mortgage Bonds(b)	2.95%	2029	140
DTE Gas	October	Mortgage Bonds(b)	3.72%	2049	140
DTE Energy	November	Senior Notes(c)	2.25%	2022	500
DTE Energy	November	Senior Notes(c)	2.95%	2030	300
DTE Energy	November	Equity Units(c)	(d)	2025	1,300
					$	3,830

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(a) Bonds were issued as Green Bonds and the proceeds will be used to finance expenditures for solar and wind energy, payments under power purchase agreements for solar and wind energy, and energy optimization programs.

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

(c) Proceeds were used to pay a portion of the purchase price of the Blue Union and LEAP acquisition. Refer to "Acquisition Financing" below for additional information.

(d)

See "Acquisition Financing" below for more information regarding the rates associated with the Equity Units.

Schedule of Debt Redeemed

In 2019, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Energy	October	Senior Notes	1.50%	2019	$	400
DTE Gas	October	Senior Notes	5.00%	2019	120
DTE Energy	December	Senior Notes	2.40%	2019	300
DTE Energy	Various	Other long-term debt	Various	2019	1
					$	821

Schedule of Maturities of Long-term Debt

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

	2020		2021		2022		2023		2024		2025 and Thereafter		Total
	(In millions)
DTE Energy(a)	$	682	$	462	$	2,716	$	1,177	$	1,425	$	10,293	$	16,755
DTE Electric	$	632	$	462	$	316	$	202	$	400	$	5,228	$	7,240

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(a)

Amounts include DTE Electric's scheduled debt maturities.