Consolidated Statements of Comprehensive Income (Unaudited) - DTE Energy Company (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement of Comprehensive Income [Abstract]
Benefit obligations, net of taxes	$ 0	$ 0	$ 1	$ 1
Net unrealized gains (losses) on derivatives, net of taxes	$ 7	$ (2)	$ 9	$ (4)

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

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