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Retirement Benefits and Trusteed Assets (OPEB - Other Changes in Plan Assets and APBO Recognized in Regulatory Assets and OCI) (Details) - Other postretirement benefit plan - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss) |  |
Net actuarial (gain) loss | $ (17) | $ 90
Amortization of net actuarial loss | (10) | (4)
Prior service cost | 0 | 1
Amortization of prior service credit | 19 | 19
Total recognized in Regulatory assets and Other comprehensive income (loss) | (8) | 106
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss) | (46) | 40
DTE Electric |  |
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss) |  |
Net actuarial (gain) loss | (6) | 24
Amortization of net actuarial loss | (1) | (5)
Amortization of prior service credit | 14 | 14
Total recognized in Regulatory assets and Other comprehensive income (loss) | 7 | 33
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss) | $ (17) | $ (4)

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