Property, Plant, and Equipment (Schedule of Interest Costs Capitalized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant, and Equipment [Line Items]
Allowance for debt funds used during construction and interest capitalized	$ 10	$ 13
Allowance for equity funds used during construction	21	21
Total	31	34
DTE Electric
Property, Plant, and Equipment [Line Items]
Allowance for debt funds used during construction and interest capitalized	8	11
Allowance for equity funds used during construction	18	20
Total	$ 26	$ 31