Property, Plant, and Equipment (Schedule of AFUDC and Interest Capitalized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Allowance for debt funds used during construction and interest capitalized	$ 12	$ 11	$ 14
Allowance for equity funds used during construction	27	25	24
Total	39	36	38
DTE Electric
Property, Plant, and Equipment [Line Items]
Allowance for debt funds used during construction	11	10	10
Allowance for equity funds used during construction	25	23	22
Total	$ 36	$ 33	$ 32