Consolidated Statements of Comprehensive Income - DTE Energy Company (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Benefit obligations, net of taxes	$ (2)	$ 0	$ 2
Net unrealized gains (losses) on derivatives, net of taxes	$ (4)	$ 15	$ (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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