Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments

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

	2015			2014
	(In millions)
Mortgage bonds, notes, and other
DTE Energy Debt, Unsecured
4.4% due 2016 to 2033	$	1,947		$	1,647
DTE Electric Taxable Debt, Principally Secured
4.4% due 2016 to 2045	5,314			4,824
DTE Electric Tax-Exempt Revenue Bonds (b)
5.2% due 2020 to 2030	310			330
DTE Gas Taxable Debt, Principally Secured
4.9% due 2018 to 2045	1,124			1,099
Other Long-Term Debt, Including Non-Recourse Debt	110			121
DTE Energy Total Long-Term Debt	8,805			8,021
Less amount due within one year for DTE Energy	(465		)	(161		)
	$	8,340		$	7,860
DTE Electric Securitization Bonds
6.6% due 2015	$	—		$	105
Less amount due within one year	—			(105		)
	$	—		$	—
DTE Energy Junior Subordinated Debentures
6.5% due 2061	$	280		$	280
5.25% due 2062	200			200
	$	480		$	480

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

	2015			2014
	(In millions)
Mortgage bonds, notes, and other
DTE Electric Taxable Debt, Principally Secured
4.4% due 2016 to 2045	$	5,314		$	4,824
DTE Electric Tax-Exempt Revenue Bonds (b)
5.2% due 2020 to 2030	310			330
DTE Electric Total Long-Term Debt	5,624			5,154
Less amount due within one year for DTE Electric	(151		)	(10		)
	$	5,473		$	5,144
DTE Electric Securitization Bonds
6.6% due 2015	$	—		$	105
Less amount due within one year	—			(105		)
	$	—		$	—

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(a) Weighted average interest rates as of December 31, 2015 are shown below the description of each category of debt.

(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.

Schedule of Issued Debt

In 2015, the following debt was issued:

Company	Month	Type	Interest Rate	Maturity	Amount
					(In millions)
DTE Electric	March	Mortgage Bonds (a)	3.70%	2045	$	500
DTE Energy	June	Senior Notes (b)	3.30%	2022	300
DTE Gas	August	Mortgage Bonds (c)	3.35%	2027	40
DTE Gas	August	Mortgage Bonds (c)	4.21%	2045	125
					$	965

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(a) Proceeds were used for the redemption of long-term debt, repayment of short-term borrowings, and general corporate purposes.

(b) Proceeds were used for general corporate purposes.

(c) Proceeds were used for the redemption of long-term debt and general corporate purposes.

Schedule of Extinguishment of Debt

In 2015, the following debt was redeemed:

Company	Month	Type	Interest Rate	Maturity	Amount
					(In millions)
DTE Electric	March	Securitization Bonds	6.62%	2015	$	105
DTE Electric	March	Mortgage Bonds	7.904%	2016	10
DTE Gas	September	Senior Notes	5.94%	2015	140
DTE Electric	December	Tax-Exempt Revenue Bonds	5.00%	2015	20
DTE Energy	Various	Other Long-Term Debt	Various	2015	11
					$	286

Schedule of Maturities of Long-term Debt

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

	2016		2017		2018		2019		2020		2021 and Thereafter		Total
	(In millions)
DTE Energy (a)	$	465	$	9	$	407	$	427	$	688	$	7,304	$	9,300
DTE Electric	$	151	$	—	$	300	$	—	$	632	$	4,552	$	5,635

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