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, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2025	$ 78
2026	82
2027	83
2028	85
2029	87
2030-2034	456
Total	871
DTE Electric
Defined Benefit Plan Disclosure [Line Items]
2025	59
2026	62
2027	63
2028	64
2029	66
2030-2034	347
Total	$ 661