Revenue (Revenues Outside the Scope of Topic 606) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Leases	$ 61	$ 60	$ 59
Operating Segments | Electric
Disaggregation of Revenue [Line Items]
Alternative Revenue Program	48	43	36
Other revenues	23	25	22
Operating Segments | Gas
Disaggregation of Revenue [Line Items]
Alternative Revenue Program	8	21	16
Other revenues	12	11	8
Operating Segments | DTE Vantage
Disaggregation of Revenue [Line Items]
Leases	$ 61	$ 60	$ 59
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Regulated and Unregulated Operating Revenue	Regulated and Unregulated Operating Revenue	Regulated and Unregulated Operating Revenue
Operating Segments | Energy Trading segment
Disaggregation of Revenue [Line Items]
Derivatives	$ 4,571	$ 2,540	$ 3,436
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Regulated and Unregulated Operating Revenue	Regulated and Unregulated Operating Revenue	Regulated and Unregulated Operating Revenue