Property, Plant, and Equipment (Depreciation and Amortization) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	$ 783	$ 740	$ 683
Regulatory assets and liabilities	193	150	159
Securitized regulatory assets	0	(38)	303
Depreciation and amortization	976	852	1,145
DTE Electric
Property, Plant, and Equipment [Line Items]
Property, plant, and equipment	582	545	489
Regulatory assets and liabilities	168	126	135
Securitized regulatory assets	0	(38)	303
Depreciation and amortization	$ 750	$ 633	$ 927