Retirement Benefits and Trusteed Assets (OPEB - Benefits related to Qualified and Nonqualified Pension Plans Expected to be paid in the Next Ten Years) (Details) - Other postretirement benefit plan $ in Millions	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2024	$ 84
2025	88
2026	89
2027	91
2028	92
2029-2033	482
Total	926
DTE Electric
Defined Benefit Plan Disclosure [Line Items]
2024	64
2025	67
2026	68
2027	70
2028	71
2029-2033	369
Total	$ 709