Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments

At December 31, 2018, DTE Energy had the following Junior Subordinated Debentures:

	Interest Rate	Maturity Date	Amount
			(In millions)
2012 Series C	5.25%	2062	$	200
2016 Series B	5.375%	2076	300
2016 Series F	6.00%	2076	280
2017 Series E	5.25%	2077	400
			$	1,180

Selected information about DTE Energy’s 2016 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)
10/5/2016	13.5	$	654	$	675	1.5%	5.0%	10/1/2019	$	98	10/1/2024

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(a) Payments of $33 million and $32 million were made in 2018 and 2017, respectively. The stock purchase contract liability, exclusive of interest, was $33 million and $66 million at December 31, 2018 and 2017, respectively.

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

	Interest Rate(a)	Maturity Date	2018			2017
			(In millions)
Mortgage bonds, notes, and other
DTE Energy Debt, Unsecured	3.2%	2019 — 2033	$	4,425		$	3,825
DTE Electric Taxable Debt, Principally Secured	4.3%	2020 — 2048	6,280			5,755
DTE Electric Tax-Exempt Revenue Bonds(b)	4.3%	2020 — 2030	310			310
DTE Gas Taxable Debt, Principally Secured	4.5%	2019 — 2048	1,550			1,330
Other Long-Term Debt, including Non-Recourse Debt			1			7
			12,566			11,227
Unamortized debt discount and premium, net			(16		)	(15		)
Unamortized debt issuance costs			(73		)	(69		)
Long-term debt due within one year			(1,495		)	(104		)
			$	10,982		$	11,039
Junior Subordinated Debentures
Subordinated Debentures	5.5%	2062 — 2077	$	1,180		$	1,180
Unamortized debt issuance costs			(35		)	(35		)
			$	1,145		$	1,145

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(a) Weighted average interest rate as of December 31, 2018.

(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	2018			2017
			(In millions)
Mortgage bonds, notes, and other
Taxable Debt, Principally Secured	4.3%	2020 — 2048	$	6,280		$	5,755
Tax-Exempt Revenue Bonds(b)	4.3%	2020 — 2030	310			310
			6,590			6,065
Unamortized debt discount			(11		)	(10		)
Unamortized debt issuance costs			(41		)	(38		)
			$	6,538		$	6,017

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(a) Weighted average interest rate as of December 31, 2018.

(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.

Schedule of Issued Debt

In 2018, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Electric	May	Mortgage Bonds(a)	4.05%	2048	$	525
DTE Energy	August	Senior Notes(b)	3.70%	2023	600
DTE Gas	August	Mortgage Bonds(b)	3.81%	2028	195
DTE Gas	August	Mortgage Bonds(b)	4.14%	2048	125
					$	1,445

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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.

Schedule of Debt Redeemed

In 2018, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity Date	Amount
					(In millions)
DTE Gas	April	Senior Notes	6.04%	2018	$	100
DTE Energy	Various	Other Long-Term Debt	Various	2018	5
					$	105

Schedule of Maturities of Long-term Debt

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

	2019		2020		2021		2022		2023		2024 and Thereafter		Total
	(In millions)
DTE Energy(a)	$	1,495	$	682	$	462	$	616	$	1,177	$	9,314	$	13,746
DTE Electric	$	—	$	632	$	462	$	316	$	202	$	4,978	$	6,590

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