Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 549	$ 711
Derivative Liabilities	(656)	(705)
Natural Gas
Derivatives, Fair Value [Line Items]
Derivative Assets	348	387
Derivative Liabilities	(461)	(383)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	193	307
Derivative Liabilities	(189)	(305)
Other
Derivatives, Fair Value [Line Items]
Derivative Assets	2	5
Derivative Liabilities	(3)	(10)
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	549	711
Derivative Liabilities	(656)	(705)
Not designated as hedging instrument | Natural Gas
Derivatives, Fair Value [Line Items]
Derivative Assets	348	387
Derivative Liabilities	(461)	(383)
Not designated as hedging instrument | Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	193	307
Derivative Liabilities	(189)	(305)
Not designated as hedging instrument | Other
Derivatives, Fair Value [Line Items]
Derivative Assets	2	5
Derivative Liabilities	(3)	(10)
Not designated as hedging instrument | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	6	12
Derivative Liabilities	(3)	(7)
Current derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	447	570
Noncurrent derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	102	141
Current derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(493)	(521)
Noncurrent derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(163)	(184)
DTE Electric | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	2	3
DTE Electric | Not designated as hedging instrument | Other
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 2	$ 3