Retirement Benefits and Trusteed Assets (Pension Plan - Fair Value Measurement using Level 3 Inputs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	$ (129)	$ 40
Pension Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	3,981	3,720
Total realized/unrealized gains (losses)	(79)	301
Plan assets at fair value, end of year	3,832	3,981
Pension Plan | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	625	565
Total realized/unrealized gains (losses)	20	38
Purchases	36	53
Sales	(39)	(31)
Plan assets at fair value, end of year	642	625
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	7	32
Pension Plan | Hedge Funds and Similar Investments
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	759
Plan assets at fair value, end of year	768	759
Pension Plan | Hedge Funds and Similar Investments | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	438	395
Total realized/unrealized gains (losses)	10	22
Purchases	4	22
Sales	0	(1)
Plan assets at fair value, end of year	452	438
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	10	21
Pension Plan | Private Equity and Other
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	187
Plan assets at fair value, end of year	190	187
Pension Plan | Private Equity and Other | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	187	170
Total realized/unrealized gains (losses)	10	16
Purchases	32	31
Sales	(39)	(30)
Plan assets at fair value, end of year	190	187
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	(3)	11
DTE Electric
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	3	3
DTE Electric | Pension Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	2,812	2,632
Total realized/unrealized gains (losses)	(56)	212
Plan assets at fair value, end of year	2,709	2,812
DTE Electric | Pension Plan | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	450	407
Total realized/unrealized gains (losses)	14	27
Purchases	26	38
Sales	(28)	(22)
Plan assets at fair value, end of year	462	450
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	5	23
DTE Electric | Pension Plan | Hedge Funds and Similar Investments
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	546
Plan assets at fair value, end of year	552	546
DTE Electric | Pension Plan | Hedge Funds and Similar Investments | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	315	285
Total realized/unrealized gains (losses)	7	15
Purchases	3	16
Sales	0	(1)
Plan assets at fair value, end of year	325	315
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	7	15
DTE Electric | Pension Plan | Private Equity and Other
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	135
Plan assets at fair value, end of year	137	135
DTE Electric | Pension Plan | Private Equity and Other | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	135	122
Total realized/unrealized gains (losses)	7	12
Purchases	23	22
Sales	(28)	(21)
Plan assets at fair value, end of year	137	135
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2015 and 2014 and reflected in Operating revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations	$ (2)	$ 8