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Retirement Benefits and Trusteed Assets (OPEB - Accumulated Postretirement Obligations in Excess of Plan Assets) (Details) - Other postretirement benefit plan - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated postretirement benefit obligation | $ 530 | $ 628
Fair value of plan assets | 296 | 326
Accumulated postretirement benefit obligation in excess of plan assets | 234 | 302
DTE Electric |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated postretirement benefit obligation | 501 | 592
Fair value of plan assets | 276 | 302
Accumulated postretirement benefit obligation in excess of plan assets | $ 225 | $ 290

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