Consolidated Statements of Comprehensive Income (Unaudited) - DTE Energy Company (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Benefit obligations, net of taxes	$ 0	$ 0
Net unrealized gains (losses) on derivatives, net of taxes	$ 1	$ (1)

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

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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