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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, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated postretirement benefit obligation | $ 628 | $ 625
Fair value of plan assets | 326 | 338
Accumulated postretirement benefit obligation in excess of plan assets | 302 | 287
DTE Electric |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated postretirement benefit obligation | 592 | 591
Fair value of plan assets | 302 | 316
Accumulated postretirement benefit obligation in excess of plan assets | $ 290 | $ 275

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