Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,953	$ 1,825
Unrealized Gains	497	406
Unrealized Losses	(72)	(102)
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	43	42
Unrealized Gains	0	0
Unrealized Losses	0	0
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	291	262
Unrealized Gains	69	63
Unrealized Losses	(6)	(5)
Hedge funds and similar investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	164	119
Unrealized Gains	5	0
Unrealized Losses	(12)	(18)
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	896	839
Unrealized Gains	420	342
Unrealized Losses	(15)	(23)
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	559	563
Unrealized Gains	3	1
Unrealized Losses	$ (39)	$ (56)