Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative assets	$ 496	$ 549
Derivative liabilities	(491)	(656)
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	496	549
Derivative liabilities	(491)	(656)
DTE Electric | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	1	2
Natural Gas
Derivatives, Fair Value [Line Items]
Derivative assets	304	348
Derivative liabilities	(289)	(461)
Natural Gas | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	304	348
Derivative liabilities	(289)	(461)
Electricity
Derivatives, Fair Value [Line Items]
Derivative assets	186	193
Derivative liabilities	(197)	(189)
Electricity | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	186	193
Derivative liabilities	(197)	(189)
Other
Derivatives, Fair Value [Line Items]
Derivative assets	1	2
Derivative liabilities	(3)	(3)
Other | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	1	2
Derivative liabilities	(3)	(3)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative assets	5	6
Derivative liabilities	(2)	(3)
Foreign currency exchange contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	5	6
Derivative liabilities	(2)	(3)
Financial transmission rights | DTE Electric | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative assets	1	2
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative assets	349	447
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(312)	(493)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative assets	147	102
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (179)	$ (163)