Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

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:

	Rate(a)	Maturity Date	2016			2015
			(In millions)
Mortgage bonds, notes, and other
DTE Energy Debt, Unsecured	3.0%	2019 — 2033	$	3,325		$	1,950
DTE Electric Taxable Debt, Principally Secured	4.4%	2018 — 2046	5,615			5,325
DTE Electric Tax-Exempt Revenue Bonds(b)	4.3%	2020 — 2029	310			310
DTE Gas Taxable Debt, Principally Secured	4.9%	2018 — 2046	1,250			1,125
Other Long-Term Debt, including Non-Recourse Debt			92			105
Total Long-Term Debt			10,592			8,815
Unamortized debt discount and premium, net			(10		)	(10		)
Unamortized debt issuance costs(c)			(67		)	(60		)
Long-term debt due within one year			(9		)	(465		)
			$	10,506		$	8,280
Junior Subordinated Debentures
Subordinated debentures	5.6%	2062 — 2076	$	780		$	480
Unamortized debt issuance costs(c)			(24		)	(15		)
			$	756		$	465

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(a) Weighted average interest rate as of December 31, 2016.

(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.

(c) Certain December 31, 2015 balances have been adjusted for the adoption of accounting guidance related to simplifying the presentation of debt issuance costs. See Note 3 to the Consolidated Financial Statements, "New Accounting Pronouncements," for additional information related to the new accounting standard.

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

	Rate(a)	Maturity Date	2016			2015
			(In millions)
Mortgage bonds, notes, and other
Taxable Debt, Principally Secured	4.4%	2018 — 2046	$	5,615		$	5,325
Tax-Exempt Revenue Bonds(b)	4.3%	2020 — 2029	310			310
Total Long-Term Debt			5,925			5,635
Unamortized debt discount			(10		)	(11		)
Unamortized debt issuance costs(c)			(37		)	(36		)
Long-term debt due within one year			—			(151		)
			$	5,878		$	5,437

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(a) Weighted average interest rate as of December 31, 2016.

(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.

(c) Certain December 31, 2015 balances have been adjusted for the adoption of accounting guidance related to simplifying the presentation of debt issuance costs. See Note 3 to the Consolidated Financial Statements, "New Accounting Pronouncements," for additional information related to the new accounting standard.

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	RSN Maturity Date
(In millions, except interest rates)
10/5/2016	13.5	$	654	$	675	1.5%	5.0%	10/1/2019	10/1/2024

Schedule of Issued Debt

In 2016, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity	Amount
					(In millions)
DTE Electric	May	Mortgage Bonds(a)	3.70%	2046	$	300
DTE Energy	May	Junior Subordinated Debentures(b)	5.375%	2076	300
DTE Energy	October	Equity Units(c)	(d)	2024	675
DTE Energy	October	Senior Notes(c)	2.85%	2026	600
DTE Energy	October	Senior Notes(e)	1.50%	2019	400
DTE Energy	December	Junior Subordinated Debentures(f)	6.00%	2076	280
DTE Gas	December	Mortgage Bonds(a)	4.07%	2046	125
					$	2,680

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

(b) Proceeds were used for repayment of long-term debt and general corporate purposes.

(c) Proceeds were used for the acquisition, see "Acquisition Financing" below for more information.

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

(e) Proceeds were used for the acquisition and general corporate purposes, see "Acquisition Financing" below for more information.

(f) Proceeds were used for the repayment of Junior Subordinated Debentures.

Schedule of Extinguishment of Debt

In 2016, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity	Amount
					(In millions)
DTE Electric	March	Mortgage Bonds	7.904%	2016	$	10
DTE Energy	June	Senior Notes	6.35%	2016	300
DTE Energy	December	Junior Subordinated Debentures	6.50%	2061	280
DTE Energy	December	Senior Secured Term Loan(a)	8.75%(b)	2022	204
DTE Energy	Various	Other Long-Term Debt	Various	2016	13
					$	807

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(a) Debt was assumed as part of the Gas Storage and Pipelines acquisition. See Note 4 of the Consolidated Financial Statements, "Acquisitions and Exit Activities".

(b) Senior Security Term Loan bore interest at LIBOR (subject to a 1% floor) + 7.75%.

Schedule of Maturities of Long-term Debt

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

	2017		2018		2019		2020		2021		2022 and Thereafter		Total
	(In millions)
DTE Energy(a)	$	9	$	406	$	1,502	$	688	$	467	$	8,300	$	11,372
DTE Electric	$	—	$	300	$	—	$	632	$	462	$	4,531	$	5,925

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