Property, Plant, and Equipment (Schedule of AFUDC and Interest Capitalized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Allowance for debt funds used during construction and interest capitalized	$ 22	$ 15	$ 15
Allowance for equity funds used during construction	25	24	28
Total	47	39	43
DTE Electric
Property, Plant, and Equipment [Line Items]
Allowance for debt funds used during construction	10	10	9
Allowance for equity funds used during construction	23	22	19
Total	$ 33	$ 32	$ 28