Consolidated Statements of Comprehensive Income (Unaudited) - DTE Energy Company (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Tax effect on benefit obligations	$ 0	$ 0	$ 1	$ 1
Tax effect on net unrealized losses on derivatives during the period	$ (4)	$ 4	$ 8	$ 5

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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