Retirement Benefits and Trusteed Assets (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Defined Benefit Plans Disclosures

DTE Energy contributed the following amounts of DTE Energy common stock to the DTE Energy Company Master VEBA Trust for funding its other postretirement benefit plans:

Date	Number of Shares	Price per Share	Amount
			(In millions)
February 17, 2015	1,427,835	$81.91	$	117
			$	117

Pension Plan

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs

Net pension cost for DTE Energy includes the following components:

	2015			2014			2013
	(In millions)
Service cost	$	100		$	83		$	94
Interest cost	210			212			192
Expected return on plan assets	(296		)	(273		)	(266		)
Amortization of net actuarial loss	205			157			208
Special termination benefits	2			—			—
Net pension cost	$	221		$	179		$	228

Net pension cost for DTE Electric includes the following components:

	2015			2014			2013
	(In millions)
Service cost	$	77		$	64		$	73
Interest cost	160			162			146
Expected return on plan assets	(210		)	(194		)	(184		)
Amortization of:
Net actuarial loss	147			110			148
Prior service cost	1			2			1
Special termination benefits	1			—			—
Net pension cost	$	176		$	144		$	184

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	2015			2014
	(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss)
Net actuarial loss	$	19		$	805
Amortization of net actuarial loss	(205		)	(157		)
Prior service credit	—			(7		)
Total recognized in Regulatory assets and Other comprehensive income (loss)	$	(186	)	$	641
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss)	$	35		$	820
Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year
Net actuarial loss	$	162		$	206

	2015			2014
	(In millions)
Other changes in plan assets and benefit obligations recognized in Regulatory assets and Other comprehensive income (loss)
Net actuarial (gain) loss	$	(13	)	$	614
Amortization of net actuarial loss	(147		)	(110		)
Prior service credit	—			(2		)
Amortization of prior service cost	(1		)	(2		)
Total recognized in Regulatory assets and Other comprehensive income (loss)	$	(161	)	$	500
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss)	$	15		$	644
Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year
Net actuarial loss	$	115		$	149
Prior service cost	$	1		$	1

Schedule of Defined Benefit Plans Disclosures

The following table reconciles the obligations, assets, and funded status of the plans as well as the amounts recognized as prepaid pension cost or pension liability in the Registrants' Consolidated Statements of Financial Position at December 31:

	DTE Energy						DTE Electric
	2015			2014			2015			2014
	(In millions)
Accumulated benefit obligation, end of year	$	4,569		$	4,853		$	3,401		$	3,712
Change in projected benefit obligation
Projected benefit obligation, beginning of year	$	5,269		$	4,380		$	4,018		$	3,341
Service cost	100			83			75			64
Interest cost	210			212			156			162
Plan amendments	—			(7		)	—			(2		)
Actuarial (gain) loss	(357		)	836			(273		)	634
Transfer due to plan sponsorship change	—			—			(99		)	—
Special termination benefits	2			—			—			—
Benefits paid	(253		)	(235		)	(192		)	(181		)
Projected benefit obligation, end of year	$	4,971		$	5,269		$	3,685		$	4,018
Change in plan assets
Plan assets at fair value, beginning of year	$	3,981		$	3,720		$	2,812		$	2,632
Actual return on plan assets	(79		)	301			(56		)	212
Company contributions	183			195			145			149
Benefits paid	(253		)	(235		)	(192		)	(181		)
Plan assets at fair value, end of year	$	3,832		$	3,981		$	2,709		$	2,812
Funded status of the plans	$	(1,139	)	$	(1,288	)	$	(976	)	$	(1,206	)
Amount recorded as:
Current liabilities	$	(6	)	$	(8	)	$	—		$	(6	)
Noncurrent liabilities	(1,133		)	(1,280		)	(976		)	(1,200		)
	$	(1,139	)	$	(1,288	)	$	(976	)	$	(1,206	)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
Net actuarial loss	$	180		$	194		$	—		$	44
Prior service credit	(1		)	(1		)	—			—
	$	179		$	193		$	—		$	44
Amounts recognized in Regulatory assets (see Note 8 - "Regulatory Matters")
Net actuarial loss	$	2,113		$	2,285		$	1,588		$	1,738
Prior service cost (credit)	(1		)	(1		)	4			5
	$	2,112		$	2,284		$	1,592		$	1,743

Schedule of Expected Benefit Payments

At December 31, 2015, the benefits related to the Registrants' qualified and nonqualified pension plans expected to be paid in each of the next five years and in the aggregate for the five fiscal years thereafter are as follows:

	DTE Energy		DTE Electric
	(In millions)
2016	$	274	$	213
2017	285		221
2018	297		231
2019	306		238
2020	314		244
2021-2025	1,662		1,279
Total	$	3,138	$	2,426

Schedule of Assumptions Used

Assumptions used in determining the projected benefit obligation and net pension costs of the Registrants are:

	2015	2014	2013
Projected benefit obligation
Discount rate	4.50%	4.12%	4.95%
Rate of compensation increase	4.65%	4.65%	4.20%
Net pension costs
Discount rate	4.12%	4.95%	4.15%
Rate of compensation increase	4.65%	4.20%	4.20%
Expected long-term rate of return on plan assets	7.75%	7.75%	8.25%

Schedule of Allocation of Plan Assets

Target allocations for the Registrants' pension plan assets as of December 31, 2015 are listed below:

U.S. Large Capitalization (Cap) Equity Securities	22	%
U.S. Small Cap and Mid Cap Equity Securities	5
Non-U.S. Equity Securities	20
Fixed Income Securities	25
Hedge Funds and Similar Investments	20
Private Equity and Other	8
	100	%

The following tables provide the fair value measurement amounts for the Registrants' pension plan assets at December 31, 2015 and 2014(a):

	December 31, 2015											December 31, 2014
	Level 1			Level 2			Level 3		Total			Level 1			Level 2			Level 3		Total
	(In millions)
DTE Energy asset category:
Short-term Investments (b)	$	23		$	—		$	—	$	23		$	46		$	—		$	—	$	46
Equity Securities
U.S. Large Cap (c)	842			—			—		842			899			—			—		899
U.S. Small Cap and Mid Cap (d)	219			—			—		219			225			—			—		225
Non-U.S. (e)	510			251			—		761			526			219			—		745
Fixed Income Securities (f)	5			1,024			—		1,029			7			1,113			—		1,120
Hedge Funds and Similar Investments (g)	220			96			452		768			226			95			438		759
Private Equity and Other (h)	—			—			190		190			—			—			187		187
Securities Lending (i)	(129		)	(25		)	—		(154		)	(189		)	(50		)	—		(239		)
Securities Lending Collateral (i)	129			25			—		154			189			50			—		239
DTE Energy Total	$	1,819		$	1,371		$	642	$	3,832		$	1,929		$	1,427		$	625	$	3,981
DTE Electric asset category:
Short-term Investments (b)	$	16		$	—		$	—	$	16		$	33		$	—		$	—	$	33
Equity Securities
U.S. Large Cap (c)	599			—			—		599			638			—			—		638
U.S. Small Cap and Mid Cap (d)	157			—			—		157			162			—			—		162
Non-U.S. (e)	367			178			—		545			378			157			—		535
Fixed Income Securities (f)	4			699			—		703			5			758			—		763
Hedge Funds and Similar Investments (g)	158			69			325		552			163			68			315		546
Private Equity and Other (h)	—			—			137		137			—			—			135		135
Securities Lending (i)	(93		)	(18		)	—		(111		)	(136		)	(36		)	—		(172		)
Securities Lending Collateral (i)	93			18			—		111			136			36			—		172
DTE Electric Total	$	1,301		$	946		$	462	$	2,709		$	1,379		$	983		$	450	$	2,812

_______________________________________

(a) For a description of levels within the fair value hierarchy, see Note 11 to the Consolidated Financial Statements, "Fair Value".

(b) This category predominantly represents certain short-term fixed income securities and money market investments that are managed in separate accounts or commingled funds. Pricing for investments in this category are obtained from quoted prices in actively traded markets or valuations from brokers or pricing services.

(c) This category comprises both actively and not actively managed portfolios that track the S&P 500 low cost equity index funds. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.

(d) This category represents portfolios of small and medium capitalization domestic equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.

(e) This category primarily consists of portfolios of non-U.S. developed and emerging market equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.

(f) This category includes corporate bonds from diversified industries, U.S. Treasuries, and mortgage-backed securities. Pricing for investments in this category is obtained from quoted prices in actively traded markets and quotations from broker or pricing services. Non-exchange traded securities and exchange-traded securities held in commingled funds are classified as Level 2 assets.

(g) This category utilizes a diversified group of strategies that attempt to capture financial market inefficiencies and includes publicly traded debt and equity, publicly traded mutual funds, commingled and limited partnership funds, and non-exchange traded securities. Pricing for Level 1 and Level 2 assets in this category is obtained from quoted prices in actively traded markets and quoted prices from broker or pricing services. Non-exchange traded securities held in commingled funds are classified as Level 2 assets. Valuations for some Level 3 assets in this category may be based on limited observable inputs as there may be little, if any, publicly available pricing.

(h) This category includes a diversified group of funds and strategies that primarily invests in private equity partnerships. This category also includes investments in timber and private mezzanine debt. Pricing for investments in this category is based on limited observable inputs as there is little, if any, publicly available pricing. Valuations for assets in this category may be based on discounted cash flow analyses, relevant publicly-traded comparables, and comparable transactions.

(i) In 2014, the Registrants began a securities lending program with a third-party agent. The program allows the agent to lend certain securities from the Registrants' pension trusts to selected entities against receipt of collateral (in the form of cash) as provided for and determined in accordance with their securities lending agency agreements.

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets

The following table provides a reconciliation of beginning and ending balances of DTE Energy's pension plan assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):

	Year Ended December 31, 2015								Year Ended December 31, 2014
	Hedge Funds and Similar Investments		Private Equity and Other			Total			Hedge Funds and Similar Investments			Private Equity and Other			Total
	(In millions)
Beginning Balance at January 1	$	438	$	187		$	625		$	395		$	170		$	565
Total realized/unrealized gains (losses)	10		10			20			22			16			38
Purchases, sales, and settlements:
Purchases	4		32			36			22			31			53
Sales	—		(39		)	(39		)	(1		)	(30		)	(31		)
Ending Balance at December 31	$	452	$	190		$	642		$	438		$	187		$	625
The amount of total gains for the period attributable to the change in unrealized gains or losses related to assets still held at the end of the period	$	10	$	(3	)	$	7		$	21		$	11		$	32

The following table provides a reconciliation of beginning and ending balances of DTE Electric's pension plan assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):

	Year Ended December 31, 2015								Year Ended December 31, 2014
	Hedge Funds and Similar Investments		Private Equity and Other			Total			Hedge Funds and Similar Investments			Private Equity and Other			Total
	(In millions)
Beginning Balance at January 1	$	315	$	135		$	450		$	285		$	122		407
Total realized/unrealized gains (losses)	7		7			14			15			12			27
Purchases, sales, and settlements:
Purchases	3		23			26			16			22			38
Sales	—		(28		)	(28		)	(1		)	(21		)	(22		)
Ending Balance at December 31	$	325	$	137		$	462		$	315		$	135		$	450
The amount of total gains for the period attributable to the change in unrealized gains or losses related to assets still held at the end of the period	$	7	$	(2	)	$	5		$	15		$	8		$	23

Other Postretirement Benefit Plan

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs

Net other postretirement credit for DTE Electric includes the following components:

	2015			2014			2013
	(In millions)
Service cost	$	25		$	26		$	35
Interest cost	62			68			67
Expected return on plan assets	(90		)	(85		)	(74		)
Amortization of:
Net actuarial loss	31			14			47
Prior service credit	(95		)	(109		)	(100		)
Net other postretirement credit	$	(67	)	$	(86	)	$	(25	)

Net other postretirement credit for DTE Energy includes the following components:

	2015			2014			2013
	(In millions)
Service cost	$	34		$	34		$	47
Interest cost	81			89			88
Expected return on plan assets	(131		)	(122		)	(110		)
Amortization of:
Net actuarial loss	43			20			64
Prior service credit	(126		)	(144		)	(131		)
Net other postretirement credit	$	(99	)	$	(123	)	$	(42	)

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	2015			2014
	(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss)
Net actuarial (gain) loss	$	(68	)	$	192
Amortization of net actuarial loss	(43		)	(20		)
Amortization of prior service credit	126			144
Total recognized in Regulatory assets and Other comprehensive income (loss)	$	15		$	316
Total recognized in net periodic benefit cost, Regulatory assets, and Other comprehensive income (loss)	$	(84	)	$	193
Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year
Net actuarial loss	$	32		$	43
Prior service credit	$	(118	)	$	(126	)

	2015			2014
	(In millions)
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss)
Net actuarial (gain) loss	$	(57	)	$	144
Amortization of net actuarial loss	(31		)	(14		)
Amortization of prior service credit	95			109
Total recognized in Regulatory assets and Other comprehensive income (loss)	$	7		$	239
Total recognized in net periodic benefit cost, Regulatory assets, and Other comprehensive income (loss)	$	(60	)	$	153
Estimated amounts to be amortized from Regulatory assets and Accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year
Net actuarial loss	$	22		$	31
Prior service credit	$	(89	)	$	(94	)

Schedule of Defined Benefit Plans Disclosures

The following table reconciles the obligations, assets, and funded status of the plans including amounts recorded as Accrued postretirement liability in the Registrants' Consolidated Statements of Financial Position at December 31:

	DTE Energy						DTE Electric
	2015			2014			2015			2014
	(In millions)
Change in accumulated postretirement benefit obligation
Accumulated postretirement benefit obligation, beginning of year	$	2,044		$	1,878		$	1,558		$	1,430
Service cost	34			34			25			26
Interest cost	81			89			62			68
Actuarial (gain) loss	(224		)	131			(166		)	100
Benefits paid	(89		)	(88		)	(65		)	(66		)
Accumulated postretirement benefit obligation, end of year	$	1,846		$	2,044		$	1,414		$	1,558
Change in plan assets
Plan assets at fair value, beginning of year	$	1,528		$	1,527		$	1,038		$	1,061
Actual return on plan assets	(25		)	62			(19		)	41
Company contributions	199			24			175			—
Benefits paid	(85		)	(85		)	(63		)	(64		)
Plan assets at fair value, end of year	$	1,617		$	1,528		$	1,131		$	1,038
Funded status, end of year	$	(229	)	$	(516	)	$	(283	)	$	(520	)
Amount recorded as:
Noncurrent assets	$	—		$	—		$	24		$	—
Current liabilities	(1		)	(1		)	—			—
Noncurrent liabilities	(228		)	(515		)	(307		)	(520		)
	$	(229	)	$	(516	)	$	(283	)	$	(520	)
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
Net actuarial loss	$	24		$	34		$	—		$	—
Prior service credit	(2		)	(5		)	—			—
	$	22		$	29		$	—		$	—
Amounts recognized in Regulatory assets (see Note 8 - "Regulatory Matters")
Net actuarial loss	$	387		$	488		$	297		$	385
Prior service credit	(131		)	(254		)	(99		)	(194		)
	$	256		$	234		$	198		$	191

Schedule of Expected Benefit Payments

At December 31, 2015, the benefits expected to be paid, including prescription drug benefits, in each of the next five years and in the aggregate for the five fiscal years thereafter for the Registrants are as follows:

	DTE Energy		DTE Electric
	(In millions)
2016	$	100	$	77
2017	105		81
2018	108		84
2019	113		88
2020	116		90
2021-2025	621		476
Total	$	1,163	$	896

Schedule of Assumptions Used

Assumptions used in determining the accumulated postretirement benefit obligation and net other postretirement benefit costs of the Registrants are:

	2015	2014	2013
Accumulated postretirement benefit obligation
Discount rate	4.50%	4.10%	4.95%
Health care trend rate pre- and post- 65	6.25 / 6.75%	7.50 / 6.50%	7.50 / 6.50%
Ultimate health care trend rate	4.50%	4.50%	4.50%
Year in which ultimate reached pre- and post- 65	2027	2025 / 2024	2025 / 2024
Other postretirement benefit costs
Discount rate (prior to interim remeasurement)	4.10%	4.95%	4.15%
Discount rate (post interim remeasurement)	N/A	N/A	4.30%
Expected long-term rate of return on plan assets	8.00%	8.00%	8.25%
Health care trend rate pre- and post- 65	7.50 / 6.50%	7.50 / 6.50%	7.00%
Ultimate health care trend rate	4.50%	4.50%	5.00%
Year in which ultimate reached pre- and post- 65	2025 / 2024	2025 / 2024	2021

Schedule of Allocation of Plan Assets

Target allocations for the Registrants' other postretirement benefit plan assets as of December 31, 2015 are listed below:

U.S. Large Cap Equity Securities	17	%
U.S. Small Cap and Mid Cap Equity Securities	4
Non-U.S. Equity Securities	20
Fixed Income Securities	25
Hedge Funds and Similar Investments	20
Private Equity and Other	14
	100	%

The following tables provide the fair value measurement amounts for the Registrants' other postretirement benefit plan assets at December 31, 2015 and 2014(a):

	December 31, 2015											December 31, 2014
	Level 1			Level 2			Level 3		Total			Level 1			Level 2			Level 3		Total
DTE Energy asset category:	(In millions)
Short-term Investments (b)	$	7		$	—		$	—	$	7		$	6		$	—		$	—	$	6
Equity Securities
U.S. Large Cap (c)	264			—			—		264			266			—			—		266
U.S. Small Cap and Mid Cap (d)	138			—			—		138			149			—			—		149
Non-U.S. (e)	262			55			—		317			222			59			—		281
Fixed Income Securities (f)	23			390			—		413			15			360			—		375
Hedge Funds and Similar Investments (g)	109			45			171		325			107			45			168		320
Private Equity and Other (h)	—			—			153		153			—			—			131		131
Securities Lending (i)	(122		)	(6		)	—		(128		)	(141		)	(17		)	—		(158		)
Securities Lending Collateral (i)	122			6			—		128			141			17			—		158
DTE Energy Total	$	803		$	490		$	324	$	1,617		$	765		$	464		$	299	$	1,528
DTE Electric asset category:
Short-term Investments (b)	$	5		$	—		$	—	$	5		$	4		$	—		$	—	$	4
Equity Securities
U.S. Large Cap (c)	183			—			—		183			179			—			—		179
U.S. Small Cap and Mid Cap (d)	97			—			—		97			102			—			—		102
Non-U.S. (e)	184			37			—		221			151			39			—		190
Fixed Income Securities (f)	17			272			—		289			11			243			—		254
Hedge Funds and Similar Investments (g)	76			32			119		227			73			31			114		218
Private Equity and Other (h)	—			—			109		109			—			—			91		91
Securities Lending (i)	(87		)	(4		)	—		(91		)	(98		)	(11		)	—		(109		)
Securities Lending Collateral (i)	87			4			—		91			98			11			—		109
DTE Electric Total	$	562		$	341		$	228	$	1,131		$	520		$	313		$	205	$	1,038

_______________________________________

(a) For a description of levels within the fair value hierarchy see Note 11 to the Consolidated Financial Statements, "Fair Value".

(b) This category predominantly represents certain short-term fixed income securities and money market investments that are managed in separate accounts or commingled funds. Pricing for investments in this category are obtained from quoted prices in actively traded markets or valuations from brokers or pricing services.

(c) This category comprises both actively and not actively managed portfolios that track the S&P 500 low cost equity index funds. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.

(d) This category represents portfolios of small and medium capitalization domestic equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.

(e) This category primarily consists of portfolios of non-U.S. developed and emerging market equities. Investments in this category are exchange-traded securities whereby unadjusted quote prices can be obtained. Exchange-traded securities held in a commingled fund are classified as Level 2 assets.

(f) This category includes corporate bonds from diversified industries, U.S. Treasuries, bank loans, and mortgage backed securities. Pricing for investments in this category is obtained from quoted prices in actively traded markets and quotations from broker or pricing services. Non-exchange traded securities and exchange-traded securities held in commingled funds are classified as Level 2 assets.

(g) This category utilizes a diversified group of strategies that attempt to capture financial market inefficiencies and includes publicly traded debt and equity, publicly traded mutual funds, commingled and limited partnership funds, and non-exchange traded securities. Pricing for Level 1 and Level 2 assets in this category is obtained from quoted prices in actively traded markets and quoted prices from broker or pricing services. Non-exchange traded securities held in commingled funds are classified as Level 2 assets. Valuations for some Level 3 assets in this category may be based on limited observable inputs as there may be little, if any, publicly available pricing.

(h) This category includes a diversified group of funds and strategies that primarily invests in private equity partnerships. This category also includes investments in timber and private mezzanine debt. Pricing for investments in this category is based on limited observable inputs as there is little, if any, publicly available pricing. Valuations for assets in this category may be based on discounted cash flow analyses, relevant publicly-traded comparables, and comparable transactions.

(i) In 2014, the Registrants began a securities lending program with a third-party agent. The program allows the agent to lend certain securities from the Registrants' VEBA trust to selected entities against receipt of collateral (in the form of cash) as provided for and determined in accordance with their securities lending agency agreements.

Target allocations for the Registrants' other postretirement benefit plan assets as of December 31, 2015 are listed below:

U.S. Large Cap Equity Securities	17	%
U.S. Small Cap and Mid Cap Equity Securities	4
Non-U.S. Equity Securities	20
Fixed Income Securities	25
Hedge Funds and Similar Investments	20
Private Equity and Other	14
	100	%

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets

The following table provides a reconciliation of beginning and ending balances of DTE Energy's other postretirement benefit plan assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):

	Year Ended December 31, 2015									Year Ended December 31, 2014
	Hedge Funds and Similar Investments			Private Equity and Other			Total			Hedge Funds and Similar Investments			Private Equity and Other			Total
	(In millions)
Beginning Balance at January 1	$	168		$	131		$	299		$	159		$	101		$	260
Total realized/unrealized gains (losses)	4			9			13			8			9			17
Purchases, sales, and settlements:
Purchases	11			34			45			9			33			42
Sales	(12		)	(21		)	(33		)	(8		)	(12		)	(20		)
Ending Balance at December 31	$	171		$	153		$	324		$	168		$	131		$	299
The amount of total gains for the period attributable to the change in unrealized gains or losses related to assets still held at the end of the period	$	—		$	3		$	3		$	7		$	8		$	15

The following table provides a reconciliation of beginning and ending balances of DTE Electric's other postretirement benefit plan assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3):

	Year Ended December 31, 2015									Year Ended December 31, 2014
	Hedge Funds and Similar Investments			Private Equity and Other			Total			Hedge Funds and Similar Investments			Private Equity and Other			Total
	(In millions)
Beginning Balance at January 1	$	114		$	91		$	205		$	111		$	71		$	182
Total realized/unrealized gains (losses)	3			6			9			5			6			11
Purchases, sales, and settlements:
Purchases	11			26			37			4			22			26
Sales	(9		)	(14		)	(23		)	(6		)	(8		)	(14		)
Ending Balance at December 31	$	119		$	109		$	228		$	114		$	91		$	205
The amount of total gains for the period attributable to the change in unrealized gains or losses related to assets still held at the end of the period	$	—		$	2		$	2		$	5		$	5		$	10