Retirement Benefits and Trusteed Assets (Benefits Expected To Be Paid) (Details) - Other postretirement benefit plan $ in Millions	Dec. 31, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2026	$ 80
2027	83
2028	85
2029	87
2030	89
2031-2035	456
Total	880
DTE Electric
Defined Benefit Plan Disclosure [Line Items]
2026	60
2027	62
2028	64
2029	65
2030	67
2031-2035	347
Total	$ 665