Significant Accounting Policies (Cloud Computing Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Amortization expense of capitalized cloud computing costs	$ 4	$ 1	$ 0
Gross value of capitalized cloud computing costs	42	16
Accumulated amortization of capitalized cloud computing costs	5	1
DTE Electric
Significant Accounting Policies [Line Items]
Amortization expense of capitalized cloud computing costs	3	1	$ 0
Gross value of capitalized cloud computing costs	33	12
Accumulated amortization of capitalized cloud computing costs	$ 4	$ 1