Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 489	$ 711
Derivative Liabilities	(601)	(705)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	489	711
Derivative Liabilities	(601)	(705)
DTE Electric | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	3	3
Natural Gas
Derivatives, Fair Value [Line Items]
Derivative Assets	264	387
Derivative Liabilities	(361)	(383)
Natural Gas | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	264	387
Derivative Liabilities	(361)	(383)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	213	307
Derivative Liabilities	(226)	(305)
Electricity | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	213	307
Derivative Liabilities	(226)	(305)
Other
Derivatives, Fair Value [Line Items]
Derivative Assets	7	5
Derivative Liabilities	(11)	(10)
Other | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	7	5
Derivative Liabilities	(11)	(10)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	5	12
Derivative Liabilities	(3)	(7)
Foreign currency exchange contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	5	12
Derivative Liabilities	(3)	(7)
Financial transmission rights | DTE Electric | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	3	3
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	359	570
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(408)	(521)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	130	141
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ (193)	$ (184)