Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 503	$ 549
Derivative Liabilities	(489)	(656)
Current derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	355	447
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(334)	(493)
Noncurrent derivative assets
Derivatives, Fair Value [Line Items]
Derivative Assets	148	102
Noncurrent derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(155)	(163)
Natural Gas
Derivatives, Fair Value [Line Items]
Derivative Assets	226	348
Derivative Liabilities	(216)	(461)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	266	193
Derivative Liabilities	(268)	(189)
Other
Derivatives, Fair Value [Line Items]
Derivative Assets	8	2
Derivative Liabilities	(3)	(3)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	6
Derivative Liabilities	(2)	(3)
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	503	549
Derivative Liabilities	(489)	(656)
Not designated as hedging instrument | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	8	2
Not designated as hedging instrument | Natural Gas
Derivatives, Fair Value [Line Items]
Derivative Assets	226	348
Derivative Liabilities	(216)	(461)
Not designated as hedging instrument | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	266	193
Derivative Liabilities	(268)	(189)
Not designated as hedging instrument | Other
Derivatives, Fair Value [Line Items]
Derivative Assets	8	2
Derivative Liabilities	(3)	(3)
Not designated as hedging instrument | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	6
Derivative Liabilities	(2)	(3)
Not designated as hedging instrument | FTRs — Other current assets | DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 8	$ 2