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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, 2022 | Dec. 31, 2021
Other changes in plan assets and accumulated postretirement benefit obligation recognized in Regulatory assets and Other comprehensive income (loss) |  |
Net actuarial (gain) loss | $ 90 | $ (113)
Amortization of net actuarial loss and settlements | (4) | (13)
Prior service cost | 1 | 1
Amortization of prior service credit | 19 | 19
Total recognized in Regulatory assets and Other comprehensive income (loss) | 106 | (106)
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss) | 40 | (165)
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 | 24 | (84)
Amortization of net actuarial loss and settlements | (5) | (11)
Amortization of prior service credit | 14 | 14
Total recognized in Regulatory assets and Other comprehensive income (loss) | 33 | (81)
Total recognized in net periodic pension cost, Regulatory assets, and Other comprehensive income (loss) | $ (4) | $ (112)

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- Definition Regulatory Assets and Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax [Abstract] + References No definition available. + Details
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