Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 2,170	$ 2,041
Unrealized Gains	634	545
Unrealized Losses	(59)	(58)
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	30	34
Unrealized Gains	0	0
Unrealized Losses	0	0
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	347	312
Unrealized Gains	98	74
Unrealized Losses	(8)	(8)
Hedge funds and similar investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	211	184
Unrealized Gains	6	4
Unrealized Losses	(7)	(9)
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	962	921
Unrealized Gains	520	459
Unrealized Losses	(13)	(11)
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	620	590
Unrealized Gains	10	8
Unrealized Losses	$ (31)	$ (30)