Consolidated Statements of Comprehensive Income (Unaudited) - DTE Energy Company (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Benefit obligations, net of taxes	$ 1			$ 1
Net unrealized gains (losses) on derivatives, net of taxes	$ 1	$ (1)	$ 2	$ (2)

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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