Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in DTE Energy's Accumulated other comprehensive income (loss) by component for the years ended December 31, 2015 and 2014:

	Changes in Accumulated Other Comprehensive Income (Loss) by Component (a)
	Net Unrealized Loss on Derivatives			Net Unrealized Gain/(Loss) on Investments			Benefit Obligations (b)			Foreign Currency Translation			Total
	(In millions)
Balance, December 31, 2013	$	(4	)	$	(6	)	$	(126	)	$	—		$	(136	)
Other comprehensive income (loss) before reclassifications	—			1			(25		)	(2		)	(26		)
Amounts reclassified from Accumulated other comprehensive income	—			—			7			—			7
Net current-period Other comprehensive income (loss)	—			1			(18		)	(2		)	(19		)
Balance, December 31, 2014	$	(4	)	$	(5	)	$	(144	)	$	(2	)	$	(155	)
Other comprehensive income (loss) before reclassifications	—			1			2			(4		)	(1		)
Amounts reclassified from Accumulated other comprehensive income	—			—			11			—			11
Net current-period Other comprehensive income (loss)	—			1			13			(4		)	10
Balance, December 31, 2015	$	(4	)	$	(4	)	$	(131	)	$	(6	)	$	(145	)

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(a)All amounts are net of tax, except for Foreign currency translation.

(b) The amounts reclassified from Accumulated other comprehensive income (loss) are included in the computation of the net periodic pension and other postretirement benefit costs (see Note 18 to the Consolidated Financial Statements "Retirement Benefits and Trusteed Assets").

The following table summarizes the changes in DTE Electric's Accumulated other comprehensive income (loss) by component for the years ended December 31, 2015 and 2014:

	Changes in Accumulated Other Comprehensive Income (Loss) by Component (a)
	Net Unrealized Gain on Investments		Benefit Obligations (b)			Total
	(In millions)
Balance, December 31, 2013	$	1	$	(17	)	$	(16	)
Other comprehensive loss before reclassifications	—		(12		)	(12		)
Amounts reclassified from Accumulated other comprehensive income	—		2			2
Net current-period Other comprehensive loss	—		(10		)	(10		)
Balance, December 31, 2014	$	1	$	(27	)	$	(26	)
Other comprehensive income before reclassifications	1		—			1
Transfer of amounts from Accumulated other comprehensive income to affiliate	—		27			27
Amounts reclassified from Accumulated other comprehensive income	—		—			—
Net current-period Other comprehensive income	1		27			28
Balance, December 31, 2015	$	2	$	—		$	2

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(a)All amounts are net of tax.

(b) The amounts reclassified from Accumulated other comprehensive income (loss) are included in the computation of the net periodic pension and other postretirement benefit costs (see Note 18 to the Consolidated Financial Statements "Retirement Benefits and Trusteed Assets").

Schedule of Finite-Lived Intangible Assets by Major Class

DTE Energy has certain Intangible assets as shown below:

	December 31,
	2015		2014
	(In millions)
Emission allowances	$	1	$	1
Renewable energy credits	38		45
Contract intangible assets	117		122
	156		168
Less accumulated amortization	62		57
Intangible assets, net	94		111
Less current intangible assets	5		9
	$	89	$	102

DTE Electric has certain Intangible assets as shown below:

	December 31,
	2015		2014
	(In millions)
Emission allowances	$	1	$	1
Renewable energy credits	38		45
	39		46
Less current intangible assets	5		9
	$	34	$	37

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table summarizes DTE Energy's estimated contract intangible amortization expense expected to be recognized during each year through 2020:

Estimated amortization expense	(In millions)
2016	$	10
2017	$	7
2018	$	7
2019	$	7
2020	$	5